bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Study on the Application Effect of Intelligent Evacuation System and Traditional Evacuation System in Road Tunnel
Authors: Cao Zhengmao , Liu Xiao
Published: March 2020

Numerical simulation was conducted to analyze the evacuation pattern of different crowds under the mixed behavior mode by using a renovated cellular automaton model. Research on intelligent evacuation system was based on the basic principle of safety evacuation, the installation location of intelligent evacuation direction system, the tunnel space structure and typical fire scenarios, with comprehensive consideration of factors such as path length, exit width, population density and distribution of evacuated people. The effects of visual induction, auditory induction and dual induction on the evacuation process of intelligent evacuation system were studied by changing the range of guidance signals to population evacuation, and a method for intelligent dynamic identification evacuation path based on multi-parameter was obtained. The results of the simulation show that the intelligent evacuation system can offer a dynamic evacuation route via the real-time control of the guidance signals, such as the sound and light indicators, and instruct the people under the fire to choose the most feasible behavior pattern so as to enhance the efficiency of evacuation. Under the different behavior patterns, it would be possible to effectively reduce the evacuation time via the dual induction mechanism of the sound and the light if a crowd manages to choose the appropriate number, location and direction of the induction signals, and enlarge the impact range of those signals. In addition, the evacuation efficiency can be expected to be raised by controlling the working status of induction signals to provide people with dynamic evacuation route based on the intelligent dynamic identification algorithm.
Strength Reduction Method Based Study on Tunnel Excavation Effect on Front Slope Stability
Authors: Mengjun Wu , Yang Xi , Hongyan Guo
Published: March 2020

During tunnel excavation and support the stability of front slope is a prerequisite for safety tunnel construction. This paper covers strength reduction method based numerical simulation and observation of displacement and plastic zones in front slope soil using ANSYS finite element software to determine the sliding surface and failure mode of front slope soil. Analyses of calculation results show the effect of excavation on the sliding surface of front slope and the effect of support structure on plastic zone of front slope.
Study on Luminance in the Threshold Zone of Highway Tunnel
Authors: Chang Wenwei , Wang Zihao , Jing Bingyin , Ma Fei
Published: March 2020

Currently, highway tunnel development is on the upswing. As an important guarantee for traffic safety in highway tunnel, tunnel lighting has a short history of research. Since the 1960s when tunnel lighting began to become a subject of research, it was gradually and profoundly realized that lighting at the tunnel threshold zone was the focus of the entire tunnel lighting. This paper provides a review on past research into tunnel lighting and findings, and then introduces the latest theory and calculation methods regarding the luminance in the threshold zone of highway tunnel with a view to giving some valuable reference for engineering practice.
Study on Settlement Prediction of Soft Soil Subgrade Based on Grey Theory
Authors: Duan Jun , Mou Chunhai , Wang Zhongwei
Published: March 2020

The settlement of subgrade is one of the dominant diseases of road engineering in soft soil areas. The settlement prediction of soft soil subgrade is beneficial to improve the level of prevention and treatment of road engineering diseases in soft soil areas. This paper takes the settlement data of highway subgrade in a soft soil area, which is located at Yunnan Province, as the research object. The grey GM (1, 1) model of roadbed settlement is established, and the sinusoidal residual error corrects the calculation model. It is shown that the model has high accuracy by comparing the predicted data with the monitored data. The model can be applied to the settlement prediction of highway subgrade in soft soil area. It can provide the necessary theoretical basis for road maintenance and management, and ultimately realize the treatment of settlement disease in the highway roadbed.
Deformation characteristics of latticed diaphragm wall in revetment foundation trench for one immersed tunnel
Authors: Chen Xiaoqing , Ding Wenqi , Zhao Tianchi , Lu Xingbang , Wei Lixin
Published: March 2020

In this paper, based on the excavation of revetment foundation trench of an immersed tunnel project in Guangzhou, China, the influence of the insertion ratio of latticed diaphragm wall, the thickness of muddy layer under the bottom of foundation trench, the grading excavation of foundation trench and the construction of undercrossing shield tunnel are considered respectively, to study the deformation characteristics of diaphragm wall by three-dimensional numerical simulation. In addition, the finite element strength reduction method is used to analyse the stability of the latticed diaphragm wall. The results show that: the maximum lateral deformation of the latticed diaphragm wall decreases with the increase of the insertion ratio. When the insertion ratio rises to about 0.63, the lateral deformation will change slightly from then on; The increasing thickness of muddy layer has more and more influence on the lateral deformation of diaphragm wall; The deformation of diaphragm wall mainly comes from the excavation of foundation trench, and is very little affected by the excavation of the shield tunnel; Under actual working condition, the safety factor of diaphragm wall calculated by strength reduction method is about 4.1 also.
Study on the Aging Deterioration Curve of Tunnel Lining in Water Rich Area
Authors: Li Rihua , Gao Xinqiang , Kong Chao
Published: March 2020

In this paper, the main influencing factors of tunnel lining deterioration are summarized, and the stability of surrounding rock, structural safety and the law of annual change of crack width under combined deterioration factors are analysed by numerical analysis method. The results show that the change of groundwater level has the most significant influence on the stability of surrounding rock. The rise of groundwater level makes tunnel appear obvious phenomenon of vault sinking and invert floating. When the water level has passed the vault, the lining structure has a significant reduction of safety factor and an increase of crack width. The deteriorated surrounding rock is prone to damage under the influence of groundwater, which directly shows an obvious expansion of plastic zone. The deterioration of lining material will not have a significant impact on the stability of surrounding rock and the structural safety factor. Among various deterioration factors, the position of wall feet on both sides and the invert are the most disadvantageous position in the tunnel. They are under high risk of cracks and seepage, which should be paid attention during the tunnel construction, operation and maintenance.
Research on Influence Zoning of Tunnel Side Crossing Existing Urban Roads Based on Ultimate shear strain Failure Criterion
Authors: Tian Mingjie , Zhang Daiqi , Qu Guiyang , Gao Lei , Li Yuqiong , Zhang Huijian , Qiu Wenge
Published: March 2020

At present, there are numerous examples of new tunnels crossing through existing urban roads. The stability of the new tunnel underneath the existing urban road is analyzed by strength reduction method. This thesis analyzes on the problems of the instability criterion of the different surrounding rocks at present, and the ultimate shear strain is selected as the criterion of instability of surrounding rock. By comparing the single tunnel with the adjacent system of the tunnel to the existing urban road, taking the difference of safety factor as the threshold value of the influence zone, the mechanical calculation models of different tunnels near the existing urban roads are established. Through the multi-factor analysis of the calculation results, the standard zoning diagram of the tunnels crossing the existing urban roads is obtained, which provides a reference for the similar projects in the future.
The Correlation Research on Reflection Characteristics of Road Tunnel’s Internal Surface & Lighting Quality
Authors: Wang Chao , Xia Yangyuyu , Liu Peng , Ma Fei
Published: March 2020

The internal wall and road surface of tunnel form the background of roadblock or vehicle together, and have a significant influence on the safety and comfort of tunnel lighting. In this paper, the optical simulation program is adopted to analyze the correlation between the reflectivity of tunnel wall and such illumination indexes as luminance and illuminance of road surface inside a tunnel, as well as the visibility of small target etc. It shows from the study that: (1) The reflectivity of wall on the luminance gain level of road surface is closely related to the luminous intensity distribution of lamps. (2) Under the circumstance that the luminous intensity distribution of lamps is consistent, the linear relations basically exist among the reflectivity of wall, the illuminance and luminance of road surface and the luminance of wall, while the maximum growth slopes are 11.29, 0.45 and 11.50 respectively. (3) The field of vision of driver can be significantly improved by a higher reflectivity of wall. (4) Compared with the three illumination modes, the visibility of small target under the pro-beam lighting is highest (the minimum visibility is 10, and the highest visibility can reach 11.6), while the visibility of small target under the counter-beam lighting is the second-highest and the visibility of small target under the symmetric lighting is most non-obvious.
Application of 3D Laser Scanning Technology for Shield Tunnel Inspection
Authors: Zhao Hailin , Huang Qiming , Wan Shifu , Qi Xingxin , Chen Yunjian , Qiu Wenge
Published: March 2020

This paper describes the application of 3D laser scanning technology in shield tunnel inspection from the working mechanism. The point cloud data collection process, processing method and result analysis of the technology in shield tunnel inspection are introduced. Finally, combined with point cloud data obtained for dislocation and clearance inspection. The dislocation and clearance inspection are visually shown by the three - dimensional cloud chart. It shows that reliable inspection information can be obtained by using this technology, and has certain practical value for tunnel inspection.
Preparation and Evaluation of Composite Flame Retardant Asphalt in Tunnel
Authors: Pang Qi , Li Jun , Gao Lei , Sun Bo , Yao Shenglei
Published: March 2020

Asphalt pavement becomes more and more popular in tunnel engineering, while its flammability is a serious problem that limits its development. In order to obtain a flame retardant asphalt, orthogonal design was utilized to investigate the best flame retardant content of magnesium hydroxide (MH), phosphorus (P) and decabromodiphenyl ethane (DBDPE). Limiting oxygen index (LOI), penetration, softening point and ductility tests were employed to evaluate the flame retardancy and pavement performance of asphalt. The results show that three kinds of flame retardants have positive influence on the low temperature performance and flame retardancy of SBS modified asphalt but not good for its high temperature performance. The best flame retardant content is determined as: 4% MH, 6% P and 8% DBDPE.
Dust Migration Law in Working Area of Large Cross-section Tunnel by Mining Method
Authors: Song Junxiu , Dong Changsong , Guo Chun
Published: March 2020

At present, there is no pertinence in the law of dust migration in the tunnel construction by mining method, although there are abundant researches. This paper studies the Qintai Tiantaishan tunnel through field measurement and numerical simulation, and analyzes the dust migration law under the conditions of drilling, mucking and guniting for the working area. The results show that: (1) Under all working conditions, the dust concentration tends to decrease in the area along tunnel face. And the higher the dust concentration, the more significant the decreasing trend. (2) When the dust concentration is small, there will be fluctuation trend. What’s more, the smaller the dust concentration, the earlier the trend appears. (3) The dust concentration under all working conditions exceeds the specification limit. Among them, the dust concentration is the highest under the condition of mucking, the next under the condition of drilling, and the lowest under the condition of guniting.
Optimization of Jacking Sequence of Shallow-buried Pipes in Saturated Soft Soil
Authors: Chen Likang , Zhu Hehua , Cheng Panpan , Zhou Long
Published: March 2020

In order to extend the method of undercutting to the construction of metro stations in soft soil, Shanghai takes a section of Guiqiao Road Station on Shanghai Metro Line 14 as trial engineering, and applies the pipe-roof method novelly to this engineering. Based on this project, the numerical simulation was used to optimize the construction sequence of pipe groups, with the purpose of reducing the disturbance to the soil stratum from pipe jacking. First of all, the stress release ratio, one of the most important parameters in the numerical model, was calibrated according to the on-site measured ground surface displacement, so that the established numerical model was validated. On this basis, a series of modellings with different jacking sequence were carried out and their disturbance degrees to the surrounding soil were comparatively analyzed. It shows that the construction sequence of the horizontal pipe groups is the decisive factor of the construction disturbance degree, and giving priority to lower pipes will reduce the ground deformation; and the less the number of steel pipes in the jacking construction, the smaller the deformation will be. Furthermore, the construction scheme of pipe groups was optimized, leading to reductions in the total and maximum surface deformation by 12% and 11.5% respectively. This study is of great significance for the further realization of micro-disturbance construction control when adopting pipe-roof method.
A Fast Image Dehazing Algorithm for Highway Tunnel Based on Artificial Multi-exposure Image Fusion
Authors: Li Wenfeng , Wei Hongyan , Qi Guanqiu , Ding Hao , Li Ke
Published: March 2020

Single image dehazing has been a challenging problem due to its ill-posed nature. This paper proposed a fast image dehazing algorithm for highway tunnel based on artificial multi-exposure image fusion. The original blurred images are transformed into under-exposed images using a series of gamma-correction operations. Meanwhile, a multi-exposure image fusion algorithm based on two-scale decomposition is proposed. It exploits the guided filter to separate each multi-exposure image into base and detail layers. The fused base and detail layers are integrated into the fused images. Then, a linear saturation adjustment method is utilized to enhance the saturation in spatial domain. Through the above image processing steps, the final haze-free images can be obtained. In this paper, the superiority of the proposed image dehazing algorithm based on artificial multi-exposure image fusion is demonstrated through theoretical analysis and experimental verification. It can quickly improve the visibility of foggy images, and make the processed images colorful and clear.
Monitoring and numerical simulation analysis of corrugated steel support in weak surrounding rock mountain tunnels
Authors: Liu Wentong , Wang Xiaoming , Jiang He , Ding Wenqi , Zhang Qingzhao
Published: March 2020

Monitoring is one of the three elements of the NATM, and it plays a guiding role in tunnel construction. At present, there are few engineering projects of using the new corrugated steel assembled structure as the initial support of the tunnel. It is of great practical significance to research its monitoring and measurement, and it can accumulate experience and provide references for the design of the initial support of the corrugated steel. In this paper, based on a weak surrounding rock mountain tunnel in Yunnan Province, which uses the corrugated steel structure as the initial support, through the analysis of the on-site monitoring data and the establishment of the corresponding finite element numerical model, it is found that the stress of the tunnel arch foot is relatively large. At the same time, the monitoring and numerical calculation of the tunnel convergence values are compared and verified, which proves the reliability of the monitoring and the calculation.
Study of Freezing Scheme in Artificial Horizontal Ground Freezing Method in Multi-lane Road Tunnel Based on Numerrical Simulation of Temperature Field
Authors: Zhang Jun
Published: March 2020

Artificial ground freezing method to form a frozen soil wall to cut off water and resist the soil pressure before excavation, was rarely used in Bangladesh such a vast hilly area. In this paper, connecting channel construction in Multi-lane Road Tunnel under the River Karnaphuli Chittagong – Bangladesh which is proposed to be constructed by double-row-ring freezing method, is taken as the study object. Taking the development of temperature field, the resisting ability of frost wall to thermal disturbance resulted from excavation, analysis of different freezing condition by numerical simulation is carried out for active and maintaining freezing stages, so that some guidance could be given for the final selection of freezing scheme. The results show that the design and construction scheme were reasonably practicable.
The Setting of Road Tunnel Cross Passages Based on Risk Analysis
Authors: Liu Shuai , Ding Hao , Pan Yong , Bin Li , Li Wei , Lü Lianghong
Published: March 2020

Cross passages are critical infrastructure for evacuation and rescue in fire accidents of road tunnels. Reasonable cross channel design is conducive to improving the efficiency of evacuation and rescue. In this paper, a key parameter setting method of highway tunnel cross-passages based on risk assessment is established. Aiming for safe evacuation of people and vehicles in the tunnel, this method is based on risk evaluation and involves comprehensive analysis of the effects of tunnel properties, traffic conditions, cross passage parameters and evacuation guidance measures so as to support the development of an optimum design of cross passages. This paper describes in detail its design approach, parameter determination process and risk evaluation method and taking an actual tunnel as example, demonstrates the process of determining key parameters of tunnel cross passages on the basis of risk evaluation.
Road Tunnel Detection Robot and Method Based on Laser Point Cloud
Authors: Li Wenfeng , Liu Yulei , Ke LI , Peng Yong , Ding Hao , Liu Qiu-zhuo
Published: March 2020

The maintenance of road tunnels is more important, and there are problems such as water seepage, surface cracking and falling off. If it cannot be detected and handled in time, it will pose a major threat to the driving safety of road vehicles. Therefore, this paper proposes a road tunnel defect detection scheme based on laser point cloud. Firstly, a robot for road detection is developed. Secondly, a road defect detection method based on laser point cloud is developed. Laser SLAM technology is used to reconstruct dense point clouds in road tunnel scenes. Finally, through the automatic detection of the three-dimensional reconstruction scene of the tunnel, the defects such as cracks and spalling of the road tunnel are automatically identified. Compared with the visual detection scheme, this method does not depend on the problem of ambient light and has better robustness and practicability.
Investigation of Deformation Influence on Throat Area of Highway Tunnel across the railway station
Authors: Li Pinpin , Huang Haiyun , Qiu Wenge
Published: March 2020

In order to ensure that Baishiyi Tunnel, an control project passing through Zhongliang Mountain, successfully passes through the throat area of the North Railway Station, track deformation control standard is established (Vertical differential settlement≤3.5mm, subgrade settlement≤3.5mm). Based on survey data, engineering analogy and numerical simulation, the influence of different excavation procedures on the ground settlement and track structure deformation is analysed. The result shows the ground settlement and trend of the measurement points at the corresponding positions of the tunnel and track structure are basically the same. The maximum ground settlement above the left line tunnel is 7.0mm, and the minimum ground settlement is 2.4mm. The ground directly above the grain dedicated line is a key part to be paid attention to in settlement control.
Review on the Development Status of Tunnel Refractory Technology Research
Authors: Song Shengyou , Xi Yang
Published: March 2020

With the economic development and technological innovation, the number of domestic tunnels has increased year by year. Because the tunnel structure is a closed and narrow structure, the loss of life and property caused by the fire is very serious. The manuscript summarizes the current status of the development of tunnel structure fire prevention technology. It introduced the development of fire protection technology for tunnel structures, fire protection technology for concrete composite structures, and fire resistance of fireproof coatings for fireproof panels, and summarized and prospected the current fire protection technology.
Study on the Limit Value of Safety Overburden Layer Thickness of Large-Span Bias Tunnel
Authors: Guo Hongyan , Liu XinRong , Like  , Cui Xiangyang
Published: March 2020

The number of mountain tunnels continues to increase, the explosive demand for traffic increases, and large-span bias tunnels are increasingly appearing in actual projects. Large-span biased tunnels can cause uneven lining stress, and unreasonable thickness of the soil can cause damage to the lining. This paper relies on the Beijing-Hong Kong-Macao Expressway Guangle Expressway. It adopts three construction methods, namely, double-wall method, three-step method and CRD method. At the same time, based on different soil thickness research, it is considered in 1:1, 1:2, 1: 3 Three kinds of slope effects, through the analysis of finite element numerical simulation results, the thickness limits of large-span bias tunnels under different slopes are given. The results show that the tunnel lining is under pressure within the thickness limit of the overburden. If it is too thin, it will cause the lining to be pulled and affect the stability of the tunnel. If it is too thick, it will increase the construction cost and waste. Therefore, the research on the thickness limit of large-span biased soil has a great guiding significance for design and construction.
Experimental Study on Mechanical Property of Highly Weathered Tuff for High-altitude Tunnel
Authors: Ke Li , Hongyan Guo , Hengxiang Song , Chen Jiabao
Published: March 2020

In the context of Milashan Tunnel in predominantly tuff whose mechanical property quickly deteriorates when in contact with water, it is necessary to study through lab test the creep property of highly weathered tuff surrounding the high altitude tunnel. This paper covers reconstruction of standard specimen with measurements of tuff dry density, natural water content and particle grading curve; analysis of axial stress and strain curves based on triaxial compression test; plotting failure stress circle to obtain tuff strength parameters c and φ; obtaining tuff rheological parameters from triaxial rheological test; deriving creep process curve by multi-specimen method; simulation of its rheological characteristics using Burgers model; and lastly identifying rheological parameters using MATLAB. It provides basic data to study deformation mode and monitoring measurement in actual construction.
Development and Application of Portable Intelligent Warning System for Safe Tunnelling
Authors: Ding Hao , Guo Hongyan , Li Ke , Ma Jianyun
Published: March 2020

With the emphasis on the construction of transportation infrastructure and the continuous advancement of county-level expressways’ “all-access and full-passage”, as well as the continuous improvement of water environmental protection during the construction process, especially in mountainous areas, the ratio of highway bridges to tunnels is getting higher and higher, tunnel engineering The construction is implemented as a control project in the construction of the highway. The combination of monitoring and measurement work has played an important role in all aspects of the tunnel construction, especially in terms of project quality, engineering cost, and progress. Monitoring and measurement should be implemented. Pay attention to the design of construction organization. As we all know, tunnel engineering is a kind of underground engineering, which itself has many characteristics such as complexity, concealment, and unmeasurability. There are many problems such as unpredictability in the development of the tunnel itself. During the construction process, the poor geological environment will not only cause problems to the technicians, but also cause the tunnel collapse, water inrush, etc., and even cause life to the construction personnel in severe cases. Hazards, thereby affecting the normal operation of the construction, causing delays in the construction period, and other issues, which will have a huge economic impact on the project. With the skillful application of monitoring and measurement, the problems existing in tunnel engineering can be predicted, so as to solve the problems and finally determine the design scheme. The application of monitoring and measurement in China’s highway tunnels is essential. Due to its concealment and the complexity of engineering geology, tunnel construction safety accidents occur frequently. Monitoring and measurement are important means of tunnel construction safety guarantee, and its informatization and intelligence are inevitable trends for future development. The article analyzes key technical issues. Proposed a reasonable solution, compiled a reasonable positioning early warning algorithm, developed an intelligent early warning system for tunnel construction safety and a portable wearable device, and successfully applied it in multiple tunnels, achieved good application results, and achieved intelligent monitoring of tunnel construction safety Visualization and visualization.
Development and Implementation of Structural Safety and Typical Distress Long Term Monitoring Technology for Operating Tunnels
Authors: Jin Fei , Guo Hongyan , Li Ke , Ma Fei , Su Junwei
Published: March 2020

With rapid development of transport infrastructure in China, expressway tunnels had exceeded 17, 000km by 2018. Tunnel projects are entering operation and maintenance periods. Tunnel operation and maintenance face serious distresses that compromise operation safety. It is urgent to develop long-term monitoring technology of tunnel structure safety and typical diseases, and develop relevant products to ensure the safety of tunnel operation. In this paper, a long-term monitoring system for operating tunnel structural safety and typical diseases is developed by analyzing the characteristics of tunnel diseases and studying the key technical problems of long-term online monitoring for structural safety. It has achieved good engineering application results, realized long-term online monitoring and early warning for operating tunnel structural safety and typical diseases, and ensured the safety of tunnel operation.
Study on Features of Hazardous Goods Transport Accidents on Highway
Authors: Xia Yangyuyu , Ma Fei , Liao Haomiao , Liao Zhipeng
Published: March 2020

This paper presents a collection of 202 hazardous goods transport accidents on road and analyses of time and spatial distribution features, inducements and forms of these accidents. The analyses results show: Frequent hazardous goods accidents occur in June and July and in the period of 8:00-10:00 each day; most accidents occur on an expressway, leading to more serious consequences if they occur inside a tunnel; major causes of hazardous goods accidents are drivers’ misoperation and vehicle fault; leakage is the most common form of accident; explosions and fires cause the most serious consequences; flammable liquid, flammable gas and toxic chemicals are three substances most commonly seen in hazardous goods accidents. At the end of this paper, a number of targeted recommendations are provided to prevent hazardous goods transport accidents based on the above results.
Analysis of the Influence of New Parallel Tunnels on the Safety of Existing Highway Tunnels
Authors: Fang Yonggang , Dong Xiqiang , Feng Jin , Ma Zhuoqian , Ma Zhe , Ding Hao
Published: March 2020

With the increasing number of construction projects in China, the intersection or proximity between new tunnels and existing tunnels is increasing. How to evaluate the impact of existing tunnels and ensure the safe operation of existing tunnels are important issues to be considered in the design of new tunnels. Based on the actual conditions of the new tunnel and the existing Jianshi tunnel of Jinliwen Expressway in the north connection of S49 provincial highway in Zhejiang Province, this paper studied the influence of the new parallel tunnel on the existing highway tunnel by analyzing the net distance between the two tunnels, the change of the supporting structure during the construction of the new tunnel and the vibration caused by the blasting construction, etc., the influence of new parallel tunnels on the safety of existing highway tunnels was studied, which provides a reference for the design and construction of similar short distance parallel tunnels.
Study on Reasonable Combination of Retaining Structure and Main Structure for Tunnel Shaft in the Offshore Environment
Authors: Jin Li
Published: March 2020

Through the investigation, the design of the combination of the retaining structure and the main structure of the large-diameter shield shaft was summarized. Combined with the characteristics of the offshore shaft, considering the difficulty in implementing underwater pouring of high-grade underground diaphragm wall, through reasonably analyzing the characteristics of chloride environmental corrosion, a reasonable solution of supporting the temporary diaphragm wall to participate in anti-floating action is proposed. For the strictness of crack control in the chloride environment, it is proposed to use the frame beam as the purlins in the excavation stage, and the waterproof problem of the construction joint is better solved. Finally, the three-dimensional calculation results confirm the stress of lining wall is reasonable.
Research on the Mechanical Response of Tunnel Structure under Water Softening Surrounding Rock
Authors: Qian Kun , Wang Xiaoming , Zhu Rongqing , Ding Wenqi
Published: March 2020

The state of water content is an important factor affecting the mechanical properties of rock. After the tunnel excavation, due to the formation of the loosening circle and the increase of the seepage path, the state of water content of the surrounding rock changes, making the mechanical properties of the surrounding rock soften with water. In this paper, the types and principles of water rock interaction are described. Taking a tunnel in Southwest China as the research object, through numerical simulation, the results of lining and surrounding rock before and after the softening are compared, and the mechanical response law of the lining and surrounding rock during tunnel excavation is discussed.
Research on Safety Evaluation Method of Tunnel Visual Environment
Authors: Zhang Qi
Published: March 2020

Starting from the driver’s visual features, safety evaluation indicators and methods of tunnel visual environment are proposed against the tunnel visual environmental characteristics, providing scientific guidance for special lighting environment in the tunnel to increase visual stimulation, transforming previous subjective evaluation into quantitative evaluation and thus improving tunnel traffic safety level effectively. The method can also be extended to the safety evaluation of other scenarios such as tunnel decoration and light color temperature.
Optimization of construction parameters of Highway Tunnel CRD Method
Authors: yuwen Wang , kaicheng Hua , Ke Li , Hongyan Guo , Xiangyang Cui
Published: March 2020

For shallow buried tunnels with poor surrounding rock stability, reasonable construction parameters are of great significance for ensuring tunnel construction safety and controlling construction quality. Taking Huiqing a tunnel as an example, comprehensive analysis of the partition wall R=11.6 ∠ 520, R=5.76 ∠1060, R=5.46 ∠1040, R=+∞∠1800 three different radii of curvature, using FLAC software for four calculations Numerical simulation of working conditions, analysis of plastic zone changes and surrounding rock deformation under different calculation conditions, and the radius of curvature of this project is proposed. The research results show that the middle partition wall adopts R=5.76 and the central angle=1060 can ensure the stability of surrounding rock and the minimum deformation of surrounding rock, which can provide a certain reference for the construction of such highway tunnels.
“Human-Vehicle-Tunnel-Environment” Based Study on Key Issues and Solutions of Operation and Maintenance Risk Evaluation for Urban Road Tunnels
Authors: Ding Hao , Ma Fei , Xia Yangyuyu , Liao Zhipeng
Published: March 2020

This paper provides analyses of operating environment features of urban tunnels in building, traffic, hydrology, vertical alignment, social environment and examination of key issues in operation and maintenance risk evaluation for urban tunnels: diversity and complexity of evaluation factors; timeliness of evaluation result; uncertainty of rating, etc. Relevant countermeasures are proposed for the above-mentioned key issues, including information collection technology based on the Internet of big data technology and risk dynamic assessment and management platform, etc., to provide a solution path for the real-time, intelligent and informatization of urban tunnel risk management and control.
Finite Element Analysis of the Influence of Deep Foundation Pit Excavation Construction on Adjacent Subway Tunnel Structure
Authors: Li Guangping , Xi Weizheng
Published: March 2020

Foundation pit excavation construction is a widespread underground engineering activity in urban construction. More and more foundation pit projects are adjacent to existing subway tunnels. Through the engineering example, the thesis analyzes the influence of deep foundation pit construction supported by double-row piles on the structural safety of adjacent subway tunnels. Firstly, the risks of the project are analyzed, and then the structural safety control standard is determined according to similar engineering and related specifications. On this basis, the finite element numerical simulation software is used to calculate and analyze the deformation and force of the subway tunnel structure during the foundation pit construction, and the safety impact of the subway tunnel structure during the foundation pit construction is evaluated.
Application and Prospect of New Steel Corrugated Plate Technology in Infrastructure Fields
Authors: Wang Xingping , Wang Zhijie , Guo Chun , Han Yu , Zhao Jianhua , Lu Nan , Tang Huizhi
Published: March 2020

This paper systematically analyses the application status and advantages of steel corrugated plate and it’s composite structure technology in domestic and foreign infrastructure construction, such as in the tunnel fields. From the aspects of Engineering characteristics, environment and energy saving, etc. We put forward the research ideas, development prospects and application ideas of steel corrugated plate technology in the field of infrastructure.
Study on Temperature Control of Ventilation System in Construction Period of High Ground Temperature Tunnel
Authors: Zhang Zengwei , Chen Fan , Yang Song , Ai Zubin , Cao Zhensheng , Mou Qibo
Published: March 2020

As China’s infrastructure continues to advance, tunnels will encounter increasingly complex geological conditions during construction. High geothermal heat seriously affects not only the normal construction of tunnels but also the physical and mental health of construction workers. Due to the existing cooling measures have poor effect and high energy consumption, so the cooling effect of the ventilation system is neglected. This paper studies the influence of ventilation system on the temperature inside the tunnel under different air supply volumes, and the distribution of temperature inside the tunnel. The numerical results show that the ambient temperature in the tunnel decreases gradually with the increase of air supply volumes at the same air temperature, but it will not change with the increase of air supply at a certain temperature. This study provides the theoretical basis for optimizing the ventilation and cooling system, it will provide a better construction environment for tunnel workers.
Construction of a large-section long pedestrian underpass using pipe jacking in water-filled clay
Authors: Wang Lishuai , Kong Chao , Peng Feng , Zhang Baobao , Deng Jiqing , Gu Song , Sun Quan
Published: March 2020

This paper presents a design and construction schemes of a pipe jacking project in Kunming, China in detail. The underpass, having a width of 6.9 m and a height of 4.9 m, was jacked 46m in water-filled clay under a busy viaduct with 4.5 m overburden soil., Some adjustments have been made to the construction process due to the characteristics of the soil layer, the surrounding environment and the existing pipeline. During the whole construction process: the pipe jacking passes through the shallow confined aquifer with high water content and high void ratio, it is easy to produce rheology. In addition, the attitude control of whole tube is also a difficulty, and some adjustments have been made to this problem; the monitoring scheme has also been adjusted accordingly. In general, this project is completed successfully and the traffic on ground and viaduct runs well during the whole construction process.
Study on the Seismic Response of Long and Large Tunnel under Non-Uniform Excitations
Authors: Zhang Xiwen , Zhu Weidong , Liu Yan , Tang Jian
Published: March 2020

In recent years, the underground tunnel engineering has developed rapidly, moving towards long, large, deep, new and complex structures. The seismic design of the tunnel should consider not only the conventional consistent excitation, but also the response of the non-uniform seismic excitation to the tunnel. Taking the actual Yellow River tunnel project as an example, the non-uniform seismic excitation analysis method is used to study the lateral and longitudinal seismic responses of the super-large tunnel, and the deformation characteristics of the top, bottom and waist of the tunnel are analysed. The study found that the longitudinal deformation and mechanical behavior of long tunnels are characterized by non-uniformity, inhomogeneity and asymmetry. Under the non-uniform excitation, the maximum response displacement of the top, bottom and waist of the tunnel section is larger than the displacement under the uniform action. Therefore, during the design of long tunnels, longitudinal seismic deformation should be emphasized, and the study of non-uniform load effect should be strengthened.
Study on the Standard of Fire Disaster Prevention for Super Large Cross Section Immersed Tunnels
Authors: Deng Xiaohua , Cao Zhengmao
Published: March 2020

Relying on the Shenzhen-Zhongshan subsea immersed tunnel project, combined the characteristics of highway tunnel traffic, the method of fire standard for super large cross section submarine immersed tunnel is proposed. Through the analysis of road tunnel fire cases, it is clear that vehicle spontaneous combustion is the main cause of tunnel fires. The ignition distance of different fire scales under the condition of tunnel traffic jam is determined by theoretical calculation. Through numerical simulation, when a super large cross section submarine immersed tunnel is fired under the condition of traffic jam, the scale of the fire is enlarged due to the ignition of the vehicle, and the fire scale design value of the super-large cross section submarine immersed tunnel is obtained. Based on the most dangerous situation of vehicle spontaneous combustion in an uni-direction four-lane tunnel, according to the actual traffic composition, the probabilistic method is used to analyze the composition of the laterally ignited vehicle and the probability of the event. It shows that the maximum probability of being ignited in a four-lane tunnel is one coach and one truck, and the fire prevention standard for Shenzhen-Zhongshan immersed tunnel is determined to be 50MW.
Design and Rapid Construction Technique for Bibanpo High-speed Railway Bifurcation Tunnel
Authors: Jiang Xinghong , Li Ke
Published: March 2020

In China, the construction of high-speed railway infrastructure plays a more and more important role in promoting economic growth. However, because of its large turning radius and incapability in bypassing and avoiding, the length of development line cannot meet the needs of separating tunnel, which has driven high-speed railway tunnel bifurcation structure become a necessity in regions with steep high mountains, gorges, ridges and valleys. In the big excavation area of bifurcation transition section, long construction period and collapse of the surrounding rock often happen. To solve those problems, we proposed a new method with rapid holing through procedure and pre-stressed anchor cable support. The methods go as follows. We put forward an optimized process of excavating and breaking through one side of the tunnel first and drilling back through the other side in consideration of the large excavation area and long construction period. We presented reinforced support system of pre-stressed anchor cable in view of problems including surrounding rocks with no secondary lining, unstable structure and unbalanced load releasing. The system has been applied to Bibanpo tunnel, a project in Shanghai-Kunming high-speed railway. By using this method, all difficulties during construction have been broken through, The study could be used as a valuable example for bifurcation structure construction in urban arterial roads and high-speed railway tunnel with the similar geological conditions such as Chengdu-Kunming high-speed railway, Chongqing-Kunming high-speed railway, and Chongqing-Changsha high-speed railway which are going to be constructed.
Construction of Mental Health Education System for College Counselors Based on Web Technology
Authors: Tian Xianli
Published: March 2020

The basic task of a college counselor to stand up to people is to contact more college students, and it is also an irreplaceable middle force for mental health education in colleges. Looking at the mental health education of college students in our country, college counselors lack the necessary psychological knowledge and attach little importance to mental health education, which leads to a great reduction in the role of mental health education practice. The purpose of this article is to build a web-based psychological health education system for college counselors, to provide psychological health education services to college counselors, and to improve the mental health education of counselors. This article will build a web-based mental health education system for college counselors based on a systematic approach so that computer networks and web technologies can be used to improve the level of mental health education services for college counselors. The system is composed of two subsystems, an online expert-type mental health knowledge system and an online psychological counseling system. The experimental results show that the college counselors’ learning on this system has strengthened the psychological common sense of college counselors, improved the counselors’ ability of self-cognition, self-evaluation, and self-balance, and also improved the counselors’ Ability for mental health education.
Distributed Landscape Design System
Authors: Yao Jinxiu , Xie Mingda
Published: March 2020

The landscape design as the human living space geographical composition is very important part of ecological system, the existence of regional landscape not only provides residents with a versatility, layout, balanced, open outdoor public space of free activities, whereas in the past the landscape design of the system is designed in accordance with the local geographical factors, more is not fully consider various comprehensive factors. The purpose of this paper is to properly introduce the existing technology based on distributed theory such as remote sensing positioning and data analysis to optimize the landscape design system. By using the data sensing module of Hadoop landscape design system and the distributed coding technology for genetic algorithm, the application of 3D landscape design is carried out. Its characteristic and innovation is the fusion of distributed storage and cluster, the design of big data dynamic storage system, analysis of its operation depends on the analysis and algorithm technology, compared with the final system operation effect. Experimental results show that the landscape design system based on distributed very well to the geographical location, topography, the surrounding environment, traffic conditions, historical and cultural factors, such as analysis, determine the theme of the landscape planning and design positioning, functional partition and content of ecological landscape, through the analysis of the landscape planning and design, take its long, avoid its short, problem solving, superposition of advantages, for a more reasonable and high quality to complete the landscape planning and design is of great significance.
Research on rural tourism based on Intelligent Tourism Information Service
Authors: Wang Rui
Published: March 2020

In this paper, a series of researches are carried out on the development of rural tourism informatization under the concept of China’s Intelligent Tourism at present. Firstly, the relationship between the development of Intelligent Tourism and tourism informatization is expounded, then the current situation of China’s rural tourism informatization is analyzed, finally, the main factors affecting the development of rural tourism informatization are put forward, and the solutions are discussed.
Research on Design Method of Interior Wall Painting Based on Computer Technology
Authors: Zhang Xiuqing
Published: March 2020

In recent years, interior wall painting has become a trend and can be seen everywhere. With the pursuit of people’s spirit and culture, the art of interior wall painting also puts forward high requirements for the artistic literacy of designers. The application of computer technology in interior wall painting design can quickly realize the effect display, save a lot of time and provide more thinking time for designers. At the same time, it also connects designers, owners and construction parties, and creates infinite possibilities for interior wall painting design methods.
Analysis and Thinking on the Transformation of Scientific and Technological Achievements based on Computer Technology
Authors: Wang Chunxi , Gan Juan
Published: March 2020

At present, the conversion rate of scientific and technological achievements in China is extremely low, only about 3%, and information asymmetry is one of the reasons why it cannot be ignored. (Ministry of industry and information technology data). The computer information system is the best solution to solve the information asymmetry. This paper discusses some feasible methods for realizing scientific and technological achievements by means of computer technology.