bluuebunny/crossref_metadata_2025 huggingface dataset:
A comprehensive experimental of degradation of pollutants in oil fields by sodium persulfate
Authors: Zhang Zhifang , Xue Yuying , Dong Sanbao , Tang Ying , Xiang Yulin
Published: March 2020

A comprehensive experiment of Fenton-like method was designed to degrade oilfield pollutants. The effects of sodium persulfate on viscosity reduction of oilfield pollutants under different reaction conditions were investigated. The emphasis was put on the determination of viscosity, and the method of data processing should be learned to optimize the best viscosity reduction scheme. The experimental content can be closely combined with the basic theoretical knowledge of Applied Chemistry in oilfields, and can be applied to field practice. It helps students to understand the role of viscosity reducers and improve their functional ability of applying chemical knowledge. At the same time, the degradation and treatment methods of oilfield pollutants meet the requirements of green chemistry and enable students to establish environmental protection concept.
Research on CO2 Emission Efficiency and Emission Reduction Potential in Beijing-Tianjin-Hebei Region
Authors: Liang Ningning
Published: March 2020

In the context of Beijing-Tianjin-Hebei coordinated development strategy, the paper selects 13 cities in Beijing-Tianjin-Hebei region as research objects, the CO2 emission efficiency and emission reduction potential of each city are analyzed in order to provide reference for achieving the target of carbon emission peak through coordinated reduction among cities. Firstly, the emission efficiency of CO2 of 13 cities in Beijing, Tianjin and Hebei in 2005-2014 was estimated using the non expected output SBM model. Then, the emission reduction potential of cities is quantitatively analyzed based on equity and efficiency of the emission reduction potential index. The results show that the overall carbon emission efficiency of Beijing-Tianjin-Hebei city is decreasing during the research period. The urban emission reduction potential index has the same trend, and Beijing has the lowest emission reduction potential and Tangshan has the highest emission reduction potential.
An Empirical Study of the Carbon Emission Kuznets Curve in Tianjin
Authors: Chen Pengju
Published: March 2020

With the reform and opening up, China's economy had developed with high speed, but the problem of carbon emissions has become increasingly prominent. Based on the traditional environmental Kuznets model, this paper studies the relationship between carbon emissions and economic growth in Tianjin from 2009 to 2018, and considers three control variables of industrial structure, energy intensity and urbanization level. The impact of carbon emissions, the establishment of an extended Kuznets model for comprehensive analysis. The results show that: First, there is no inverted “U” relationship between industrial carbon emissions and economic growth in Tianjin, it is a kind of inverted “N” type curve relationship, and it is currently at the second turning point. Second, Tianjin's carbon emissions are also affected by industrial structure, energy intensity and urbanization rate. The share of secondary industry and energy intensity have a positive impact on carbon dioxide emissions, and the impact of urbanization on carbon emissions is also very low.
Study on the Harmonious Development of Carbon Emission and Eco-environment in Logistics Industry -- Taking Beijing-Tianjin a- Hebei as an example
Authors: Bao Jinjian , Li Hong
Published: March 2020

As the capital economic circle of China, Beijing-Tianjin-Hebei has always been a model for national development, but with the development of its economy, environmental issues have increasingly attracted the attention of the state. I Combined with the current background of the times, it is necessary to study the carbon emissions of the logistics industry in Beijing-Tianjin-Hebei. Through the research on the carbon emission situation of the logistics industry in Beijing-Tianjin- Hebei in the past ten years, the sample data was selected to construct the coupling index system of carbon emission and ecological environment in the logistics industry. The coupling model and the system coupling coordination degree model were analyzed to obtain the Beijing-Tianjin The coupling coordination degree of the vast ecosystem is in a relatively coordinated development stage, showing a trend of rising volatility. In response to this summary, the opinions on optimizing the industrial structure of the logistics industry and jointly controlling carbon emissions with the state and enterprises are given, in order to finally realize the low-carbon transformation and sustainable development of the logistics industry.
Effect of rainfall intensity on PM10 and PM2.5 scavenging in Guangzhou at night
Authors: Wang Yiming , He Li
Published: March 2020

The Lingnan area is a region where frequent rainfall occurs in mainland China. In addition to the special occurrence period, the nighttime rainfall has obvious seasonal characteristics, which is different from the climatic boundary conditions during the daytime, and has a great influence on the migration and transformation process of atmospheric pollutants. By counting the observations of atmospheric particulate matter (PM2.5, PM10) before and after rainfall in the Pearl River Delta region, the average clearance rate of PM10 and PM2.5 for the whole region was 2.36% and 1.41%, and the average clearance rate of night rainfall was calculated. 6.44%, 4.22%. The results show that the rainfall can effectively remove atmospheric particulate pollutants through wet deposition, and the nighttime rainfall is more effective than the daytime rainfall on the atmospheric particulate matter. Through classification discussion, it is found that the greater the rainfall intensity, the longer the rainfall time, the larger the particle size, and the more obvious the advantage of night rain.
Research Progress on bacterial cutinases for plastic pollution
Authors: Xu Ziyu
Published: March 2020

Cutinases(3.1.1.74) are serine esterases that belong to the α/β hydrolase family. Such enzymes are usually produced by phytopathogenic microorganisms in order to penetrate their hosts. Cutinase can degrade the stratum corneum in the leaves or the keratin of the cork in the bark. Cutinase hydrolyzes soluble esters, insoluble triglycerides and various polyesters. In addition to the hydrolysis reaction, cutinase also shows synthetic activity and transester activity. Therefore, as a multifunctional enzyme, cutinase has many fields of application. In recent years, it has been found that cutinase can biodegrade plastic and biomoodifie synthetic fibers. Cutinase is the most important enzyme in solving plastic pollution.
Study on CO2 capture by AAILs-MDEA aqueous solution in packed tower
Authors: Zhong Zhong , Liao Yujie , Fu Dong
Published: March 2020

This study mainly uses N-methyldiethanolamine (MDEA) as the main body of absorption, and uses three kinds of AAILs(AAILs), 1-butyl-3-methylimidazolium lysinate ([Bmim][Lys]), tetramethylammonium glycinate ([N1111][Gly]) and 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]) as accelerator, respectively. That forms a new blended aqueous solution for CO2 removal. The new AAILs-MDEA aqueous solution absorbent has stronger ability to absorb CO2, faster absorption rate and lower equipment corrosion. When the gas flow rate is 500ml/min and the liquid flow rate is 150ml/min, the best removal efficiency is achieved. At 313.2K, the removal efficiency of MDEA-[N1111] [Gly] absorbent can reach 100%; the effect of the three new alkanolamine aqueous solutions on CO2 absorption is: MDEA-[N1111][Gly]>MDEA-[Bmim] [Gly]>MDEA-[Bmim][Lys].
Identification of Rheological Model of the Layer Composite Rock Mass and Its Application
Authors: Han Bing , Fu Qiang , Hou Hanfang
Published: March 2020

The layer composite rock mass is composed of soft rock and hard rock. The difference of their mechanical characteristics is obvious. It is difficult to describe comprehensively the complicated property with the existent constitutive model. Based on the rheological properties of soft rock and hard rock in the composite rock mass and the creep experiment curves, the rheological model can be used by connecting Burgers model in series with a plastic component. The rheological curves of the composite model under diverse stress level can be attained by multi-staged loading. The simulated result is proved good by comparing the theory curves and the experiment curves. The rheology principium of the complicated rock mass can be illuminated well by the model so that it could be popularly used in engineering practice.
Evaluation of Air Pollution Control Efficiency in Hebei Province Based on DEA Method
Authors: Xu Qiaochu
Published: March 2020

In this paper, the operation cost, the total investment in environmental infrastructure construction, the exhaust gas treatment facilities are selected as the input variables and the industrial exhaust gas emission, the industrial SO2 removal quantity, the industrial dust removal quantity and the industrial dust removal quantity as output variables of air pollution control. Besides, the efficiency of air pollution was controlled in Hebei province from static and dynamic aspects were measured from 2005 to 2015 by exploiting BC2 model. Finally, according to the analysis results, corresponding policy suggestions are given from different perspectives, including strengthening independent innovation capability, adjusting and optimizing industrial structure, increasing investment in pollution control, optimizing capital source and using structure of pollution control, and constructing reasonable and effective external supervision mechanism.
Will infrastructure construction cause environmental pollution in China?
Authors: Luo Yunyun
Published: March 2020

Whether it is the historical experience of developed countries or the practice of most developing countries, it has been shown that in the stage of national industrialization and infrastructure construction, environmental pollution will accompany it. With the development of the country's industrialization and the improvement of people's awareness of environmental protection, the discharge of pollutants such as industrial wastewater and waste gas has caused people to pay more attention to environmental issues. This article comprehensively analyzes the impact of infrastructure construction on environmental pollution based on data from eastern China in 2009-2017. The research results show that infrastructure construction has a significant impact on environmental pollution in eastern China. Specifically, infrastructure construction has significantly increased the discharge of industrial wastewater and exhaust gas. Therefore, China needs to pay more attention to certain new pollution sources in the process of increasing infrastructure construction. All regions should strengthen cross-regional environmental protection cooperation and focus on green development.
Research on Desulfurization and Denitration Technologies of Ship Exhaust
Authors: Chen Peng
Published: March 2020

Ship exhaust is one of the main sources of air pollution, at present; there are three methods for treating ship exhaust, including desulfurization, denitration, and desulfurization-denitration integration. This paper introduces the mainstream desulfurization and denitration technologies, and the desulfurization-denitration integration technology can achieve the simultaneous removal of multiple pollutants, which will become the main method of ship exhaust treatment in the future and has broad development prospects. This paper introduces some treatment methods and advantages and disadvantages of ship exhaust, and hopes to provide some references for the treatment of ship exhaust.
A New model on evaluating environmental degradation
Authors: Chai Zhaoyuan , Zhang Mingyu , Xing Gaoshan
Published: March 2020

Environmental protection has attracted more and more attention in today’s society. Traditionally, most land use projects do not consider the impact of, or account for changes to, ecosystem services. To better evaluate the environmental degradation, we created an ecological services valuation model. Our EDC-GP Model provides a quantitative analysis of Environmental Degradation in different areas. Then apply it to both large national project and small city-based project.
Effects of insect frass with different cadmium content on maize plant growth and cadmium accumulation
Authors: Cai Ruijie , Wu Xiang , Wang Xiaobo , Xu Xiaoyan
Published: March 2020

In order to explore the effect of cadmium in insect frass on the growth of maize, the pot experiment method was selected to investigate the effects of black soldier fly frass with different cadmium contents (0mg•kg-1,2mg•kg-1,12mg•kg-1,28mg•kg-1) on maize plant height, chlorophyll content, photosynthetic rate and cadmium accumulation in plants. The results showed that there were no difference between treatments for maize plant height. Insect frass with 28 mg•kg-1 cadmium contents improved chlorophyll content and photosynthetic rate at 30th day. Cadmium content in plants and roots increased significantly with increasing of cadmium content in insect frass. The highest Cadmium content of plants and roots were 0.32mg•kg-1 and 1.50mg•kg-1 respectively.
Study on the Adsorption Properties of Different Insect Feces on Cu2+ and Cd2+
Authors: Zhang Mingfu , Tang Zhijuan , Zhao Yi , Wang Xiaobo , Xu Xiaoyan
Published: March 2020

In order to understand the adsorption properties of insect feces on heavy metals, White grubs feces and Black soldier fly larvae (BSFL) feces were selected as the adsorption materials to study the adsorption properties of insect feces on Cu2+ and Cd2+. The results showed that the adsorption effect increased significantly with the increasing of the amount of insect feces, and the best adsorption effect were 2g White grubs feces and 4g BSFL feces in 100ml (10mg/L) Cu2+ and Cd2+. With increasing of concentration Cu2+ and Cd2+ (0-20 mg/L), the adsorption quantity of Cu2+ and Cd2+ increased. Adsorption quantity of BSFL feces for Cu2+ was more than White grubs feces, while for Cd2+ was less than White grubs feces when concentration of Cd2+ was over 10mg/g. With the increase of pH, the adsorption rate of White grubs feces and BSFL feces on Cu2+ and Cd2+ decreased significantly.
Nonlinear Response of a Subsea Tunnel Constructed by Two Tunnelling Methods subjected to Strong Seismic Shaking
Authors: Chen Juntao , Hao Kun , Chen Jiabao , Ma Jianyun
Published: March 2020

In this paper, a three-dimensional numerical model is built to study the seismic response of a subsea tunnel constructed by two tunnelling methods, including the TBM tunneling and drill-and-blast tunneling. In the numerical model, the plastic-damage model is used to simulate the elastic and plastic behaviour of concrete under dynamic loadings. To illustrate the seismic response of the tunnel and yet limit the amount of data included in the paper, the work presented is limited to the deformation of tunnel cross sections and dynamic stress responses. Based on the results, the deformation and stressed of different tunnel sections are discussed. Results show that the amplitude of maximal principal stress occurs at sidewall basement of the inner liner. The spandrel and the sidewall basement are the most precarious area.
Trial Study on Visual Recognition of Cross-channel Indication Signs in Limited-visibility Tunnels
Authors: Yong Pan , Shuai Liu , Jian Zhong Chen
Published: March 2020

For the problem that evacuation personnel cannot find evacuation location and route quickly and accurately when there is a fire in tunnel, by using eye-tracker to record eye data and selecting X-angle and Y-angle space position indicator to research target awareness, and compared and analyzed the visual recognition, orientation and functionality in different cross-channel indicators at different distances for different groups. The trial results showed that cross-channel indicator signs in existing tunnel lack visual recognition and induction. After adding LED-induced flashing signs and evacuation indicator pattern within green and white edges into cross-channel, visual recognition was improved significantly. Evacuation personnel can better evacuate in condition of limited- visibility and unclear direction and can timely find the evacuation location and escape route so that people can improve self-help ability when there is a fire in tunnel.
Monitoring and analyzing the shallow-buried highway tunnel in the soft stratum
Authors: Yang Zhihua , Wang Zhongwei
Published: March 2020

The large deformation is one of the important characteristics of the shallow-buried highway tunnel (SBHT) in weak strata. To analyze the deformation law, the monitoring of ground and vault subsidence of Yunfu Road tunnel under Caiyun North Road in Kunming is carried out. The influence of excavation on the temporal and spatial characteristics of the SBHT in weak strata are elaborated. Based on the monitoring results, the deformation characteristics of the surrounding rock are analyzed. What’s more, some effective measures to control the deformation of surrounding rock in tunnel construction are pointed out, and the basis for the optimization of support system is provided. The research results can guide and used for the construction of the SBHT passing through similar soil strata.
Numerical simulation on ground deformation characteristics during double-line shield tunnel crossing airport runway
Authors: Ding Wenqi , Shao Zhili , Lu Xingbang , Qiao Yafei
Published: March 2020

Using Peck empirical formula and superposition method, the variation of ground settlement, uneven settlement and ground curvature caused by single-line and double-line shield tunnel are obtained. The finite element numerical simulation method is used to analyze the construction process of shield tunnel below the airport runway. Considering the existence of the runway structure and the successive excavation effects of the left and right line, the comparison of simulation and empirical formula is analyzed. Based on this, the deformation Characteristics of the runway is derived under different buried depths and different ground loss ratios.
Research on Influence Zoning of New Tunnels Crossing Existing Urban Roads by Orthogonal Design Considering Horizontal and Longitudinal Effects
Authors: Tian Mingjie , Zhang Jiangbo , Zhao Shun , Li Yuqiong , Mou Zhiheng , Zhang Huijian , Qiu Wenge
Published: March 2020

The influence of this proximity system is essentially within the stress superposition region, the stability of the new tunnel underneath the existing urban road is analyzed by strength reduction method, 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, at a safety factor difference of 0, as a partition threshold of the influence region, the mechanical calculation models of different tunnels near the existing urban roads are established under 192 working conditions. Through multifactor analysis of the calculation results, at the same time, considering that the influence of new tunnel excavation on existing urban roads is mainly longitudinal effect, and the influence of existing urban roads on new tunnels is mainly transverse effect, the influence range diagram of longitudinal and transverse effect is established, which provides reference for similar projects in the future.
Hierarchical coding system of tunnel engineering for highway maintenance informatization
Authors: Han Kunlin , Qin Feng , Pu Duan
Published: March 2020

With the constant promotion of the “comprehensive and accurate” highway maintenance policy, the demand for application of tunnel maintenance informatization is expanding, and the standardization of hierarchical coding for the tunnel engineering is critically urgent. In this paper, the hierarchical informatization and coding system of related industries are analysed firstly, and then the hierarchical coding structure and classification code with high accuracy on the level of structural units and affiliated facilities are designed according to the combination of highway tunnel properties and maintenance characteristics. At last, the modular congruence algorithm is adopted for automatic verification, and a set of hierarchical coding system for highway maintenance information is preliminarily established. Furthermore, the research of the hierarchical coding system application has laid a solid foundation for the whole life cycle maintenance management of highway tunnel.
Research on Risk Assessment of Complex Mountain Tunnels Based on AHP-FCE
Authors: Zheng Changqing , Chen Binke , Li Weiping , Zhang Zhiqiang
Published: March 2020

Complex geological environment and difficulties in operation and maintenance of mountain tunnels result in a lot of damage during the operation period of mountain tunnels. Therefore, the risk assessment and reinforcement technologies for complex mountain tunnels during the operation period need to be developed and improved. As a result, in this paper, the research on safety influence factors and their weights during the operation period of complex mountain tunnels was conducted based on Fuzzy Comprehensive Evaluation (FCE) and Analytic Hierarchy Process (AHP), the fuzzy set of weights for risk influencing factors during the operation period of complex mountain tunnels was established, the membership functions of factors at the index level were determined, the comprehensive evaluation matrix of tunnel risks was obtained, and the fuzzy comprehensive evaluation method for risks of complex mountain tunnels was proposed. This method has been verified in the Jinjishan Tunnel, and its analysis results are credible. In addition, corresponding risk prevention and control measures were put forward based on the evaluation results, and they provided guidance and reference for similar projects.
Lighting environment analysis of Chengdu underground commercial spaces
Authors: Xie Yi , Liao Jixuan , Guo Chun , Zhang Ke , Zhang Jiapeng , Yang Kun
Published: March 2020

In order to learn the current lighting environment of underground commercial space in Chengdu, we selected the Sino-Ocean Taikoo Li Chengdu, Tianfu Square Jinzhan Shopping Center and Diyi Avenue Underground Commercial Street as the research objects and using field test method to investigate the illuminance, lights colour temperature and the road surface luminance. Through contrast test data to analyse the lighting environment, this paper put forward the suggestions such as bring in natural light, adding commercial stores in channels and selecting colour temperature reasonably to enhance the lighting environment of underground shopping malls which only under artificial lighting conditions.
Atomization performance of Tiantaishan tunnel spray dust reduction
Authors: Song Bin , Dong Changsong , Wang Xin , Guo Chun
Published: March 2020

In order to further improve the efficiency of spray dust removal in tunnel and obtain favorable equipment parameters, the dust removal performance of high pressure spray atomization particle size was deeply studied. Taking the dust generated in Tiantai Mountain tunnel as the research object and combining with the numerical simulation method. Based on FLUENT pressure-swirl atomization model, in this paper, the mechanism of high pressure spray dust reduction is analyzed. The pressure nozzle is simulated at 4 pressures (2, 3, 4, 5 Mpa) and 3 nozzles (2.0, 1.5, 1.0 mm in diameter). The simulation results show that when the nozzle diameter is constant, the droplet size decreases with the increase of pressure, and the atomization effect is better. When the spray pressure is constant, the droplet size increases with the increase of nozzle diameter. According to the measured results of dust in Tiantai Mountains, it is suggested that the nozzle diameter should be 1.5 mm and the working pressure should be 4 Mpa, which can reasonably and effectively settle the fine particles of dust in the tunnel.
The Physical Model Test’s Research of Ventilation in Super-long Highway Tunnels
Authors: Jianzhong Chen
Published: March 2020

Based on hydromechanics affinity theory and major control factor of highway tunnel ventilation, highway tunnel ventilation boundary condition was determined in this paper. Based on Navier-Stokes equation, tunnel ventilation model experiment affinity theory was deduced and Reynolds Number chosen as the affinity norm of the tunnel ventilation physical model. Based on Nikuratse Testing, the influence factor of Reynolds Number and the form reason of affinity self pattern area were analyzed. The experiment method of affinity self pattern area was discussed. Complete tunnel ventilation model-design method was given in this paper.
Investigation and Analysis on the Vehicle Cross Passages of Highway Tunnels
Authors: Li Bin , Li Wei , Lü Lianghong , Ding Hao , Liu Shuai
Published: March 2020

Vehicle cross passages are critical infrastructure for emergency rescue in highway tunnels but how to use them is disputed in the industry. This paper investigates 9 expressway operation and management companies in China and 292 highway tunnels in their charge through site interviews and questionnaires to understand and analyze traffic routes of general vehicles and rescue vehicles and the use of vehicle cross passages during routine operation & maintenance, traffic accident and fire incident handling by each company. The survey results show: it is difficult for large vehicles to pass through vehicle cross passages due to the small radius of turning circle at the corner, and the influence on traffic safety in the adjacent tube is great. It is not recommended to use vehicle cross passages if traffic in the adjacent tube is not interrupted. The use of vehicle cross passages should be limited to rescue vehicles in initial stage of fire incidents.
Numerical Ultimate Load Analysis Based Study on Safety Monitoring Reference Value for Tunnels in Weak Rock
Authors: Guo Hongyan , Xiao Zhiwei , Li Ke , Song Hengxiang
Published: March 2020

It is usually hard to ensure overall stability and construction safety when tunneling in weak rock. Therefore, it is of practical engineering significance to conduct safety monitoring reference value study based on numerical ultimate load analysis by building an equivalent rock model. In this paper we investigate ultimate strains of equivalent rock masses of different classes based on numerical ultimate load analysis by building an equivalent surrounding rock model; examined the deformation reduction factor changes for different classes of surrounding rock by building a plane model for calculation and analysis; established tunnel stability assessment criteria through observation of ultimate shear strain diagrams under different reduction factors; and determined appropriate management measures according to warning levels. Our analyses show (1) under different loads the higher the rock mass classification the smaller its vertical displacement and hence its ultimate strain; (2) the higher the rock mass classification the more susceptible it is to strength, creep and instabilities; (3) Assessment criteria are established by comparing displacement U measured during tunneling with the ultimate displacement U0, i.e. the tunnel is stable if U < U0 and unstable if U > U0.
Eye Adaptation Effect Based Study on Configuration of Tunnel Entrance Structure
Authors: Gao Guogang , Xia Yangyuyu , Wang Zihao
Published: March 2020

Due to the unique nature of the tunnel as a tubular structure, an approaching motorist experiences an abrupt change in brightness under the black-hole effect. This sharp change in brightness makes the threshold zone prone to traffic accidents. It is therefore necessary to provide a dimming structure in the threshold zone to support the eye adaptation of the motorist to lower lighting levels in the interior of the tunnel. There is currently a lack of research worldwide on specific configuration parameters and types of dimming structure. This paper covers analysis of the entrance structure of a tunnel and comparison of different alternatives in non-sun-tight louver, its height and transmittance, and proposes an optimal scheme to increase traffic safety and comfort.
Study on static mechanical properties of gabion specimen
Authors: Longgang Miao , Huijian Zhang , xiaoyu Niu , Rui Zhu , Qingshuai Xue , Yongwang Jiang
Published: March 2020

In order to study the static mechanical properties of gabion specimen. The experiments of unconfined compressive strength test of gabion specimens under different conditions with different parameters were conducted, including the shape of gabion specimen (Cube and Cylinder), the size (Height diameter ratio) and the specifications of wire mesh. The experimental results display as follows: 1) Gabion specimens go through four phases: elastic compression, deformation cracking, rockfill compression and rockfill crushing during the unconfined compressive strength test; 2) The contrast of cube specimens and cylinder specimens show that the vertical load of the former general appears as several alternate crests and troughs before peak appears during the vertical loading, while the latter general shows that the first crest is the peak; 3) The contrast of the cylinder specimens with different heights show that the height of the specimens have a obvious impact on post-peak strength, circumference deformation and fractures of the wire mesh. While there is no remarkable effect on peak force of unconfined compassion test by changing the height of specimens. The experimental results can provide some theoretical support for the academic study and engineering design in the future.
Study on Application of a Five-step Approach to Gradual and Fast Coal Uncovering during Gassy Tunnel Construction
Authors: Cheng Liang , Li Ke , Jiang Xinghong
Published: March 2020

A five-step approach to gradual and fast coal uncovering during gassy tunnel construction is developed to address high risks and tunnel construction safety problems related to protracted coal uncovering. By examining the technical principle of gradual and fast crosscut coal uncovering technique, this paper concludes multi-parameter prediction is the key to this technique. It establishes multi-parameter prediction criteria for coal burst hazard and multi-dimensional arrangement of prediction holes; discusses how to set up a movable safety barrier zone and determine its scope; and develops a gradual and fast coal uncovering process for construction of gassy tunnels by which the burst-prone coal seam is uncovered through gradual excavation and advancement under the protection of the safety barrier. Application of this technique on the construction site of Huayan Tunnel shows this technique is easy to apply, economical and safe and significantly reduces the time spent on coal uncovering.
Research on Fire Smoke Controlling Effect of Submarine Road Tunnel Based on FDS
Authors: Cao Zhengmao , Liu Xiao , Chen Jianzhong
Published: March 2020

Taking submarine road tunnel as the research objective, numerical calculation model of fire smoke controlling in rectangular underwater tunnel was established by FDS. The adaptability of lateral concentrated exhaust mode in tunnels of variable widths is obtained according to analysis of smoke distribution and smoke exhausting efficiency under different working conditions. The results are as follows: The increase of width results in the decrease of smoke exhausting efficiency. In the four-lane dual-directional tunnel, the smoke exhausting efficiency is 83.4%; while that of twelve-lane dual-directional tunnel is only 55.2%. The wind velocity is higher in the area near the lateral exhaust valves; and which is lower in the area far from the exhaust valves. The influence of wind velocity for lateral exhaust valves is limited. With the increase of width, the wind velocity of cross-section decreases dramatically. In a four-lane dual-directional tunnel, the wind velocity of the right wall decreases by 32%, and that in twelve-lane dual-directional tunnel decreases by 59.6%. For large-span rectangular tunnels of eight-lane dual-directional or even wider ones, the lateral centralized exhaust mode shows poor fire smoke controlling effect.
Optimized Selection of Construction Scheme for Huiqing Expressway Tunnel
Authors: Kaikeng Hua , Hongyan Guo , Ke Li , Xiangyang Cui
Published: March 2020

In view of the complex construction environment of the mountain tunnel, the construction method conforming to each project is adopted, which is beneficial to avoid blind spots during the construction process. For poor surrounding rock conditions, the thickness of different soils will lead to the joint of the plastic zone of the excavation face, which will cause the overall settlement. Taking Maple Ridge, Daping and Fengshuao Tunnels as an example, comprehensive analysis of different surrounding rock thickness conditions, through the comparison of three construction methods of double side wall method, CD method and three step method, using FLAC finite element software results Analysis gives the most advantageous deformation control method. The results show that the larger the thickness of the overburden, the larger the displacement of the arch and the arch, the double-wall method does not extend to the slip zone in the plastic zone of different soil thickness, and the surrounding rock also maintains the self-stability, compared with the other two methods. Good stability. Therefore, it has a good guiding significance for the construction method in the same situation in the future.
Study on Fire Accidents in Tunnels
Authors: Bai Jianying , Liao Haomiao , Xia Yangyuyu
Published: March 2020

This paper provides a collection of information on 156 tunnel fire accidents at home and abroad and analysis of their time and spatial distribution, accident causes and effects. The study shows: most tunnel fires occur in summer; tunnel fire accidents are frequent in economically developed areas of eastern and southern China as well as mountainous areas in southwestern and northwestern China; long tunnels and super long tunnels experience more fire accidents which occur mostly at tunnel entrance/exit; most tunnel fires are caused by spontaneous combustion of vehicles and traffic accidents; cars and trucks are the most frequently seen models in tunnel fires; consequences of tunnel fires include casualties, vehicle damage, damages to tunnel structure and facilities and traffic interruption. At the end of the paper, appropriate measures and advice are proposed for tunnel fire accidents based on the above analysis results.
Study on multi-arch tunnel leakage disease with influence of rainfall and groundwater change
Authors: Shi Jianxun , Zhang Xingkai , Liang Jizong , Hu Lihang , Li Zhaohui
Published: March 2020

It is known that the tunnel leakage is significantly affected by precipitation, for example the seasonal rainfall and the groundwater level change, which reduce the effective stress and the shear strength of the surrounding rocks, resulting in surrounding rock fracture and the connection of crack path between surrounding rock and lining structure. This paper reveals the relationships between the tunnel leakage with the lining crack width, the surface seepage, and the construction joints. Then the calculation equations of leakage water are deduced. According to the deduced equations, the influence of rainfall and groundwater level on leakage of the multi-arch tunnel is analysed. It is concluded that the leakage water increases with the rise of ground water level, decreases with the increase of the thickness of the lining; and the spot leakage and the surface leakage both increase as the increasing of the crack width and the seepage radius. On the basis of the conclusions, the preventions and treatment measures of leakage caused by rainfall and groundwater level change are put forward to ensure the long-term safe operation of the multi-arch tunnel.
Research on the influence zone dividing of tunneling adjacent to existing tunnel based on ultimate strain criterion
Authors: Mou Zhiheng , Zhang Huijian , Tian Mingjie , Qiu Wenge
Published: March 2020

This thesis estimates the effects of tunneling parallel to or crossing the existing tunnel. According to the ultimate strain criterion, this paper suggests effective method to simulate failure process of geological materials, which combines with strength reduction FEM. Through numerical simulation and criterion of the influence zone dividing, the regulation of the stability of an individual tunnel was proposed in this paper, moreover, dividing influence zones by using upper and lower limit if surrounding rock parameters, which was defined as the strong influence zone, the weak influence zone, and the non-influence zone. Furthermore, this thesis discusses the transverse and longitudinal effect of two orthogonal excavation. Conclusions that were drawn in this paper can be utilized in actual excavation.
Discussion on the Treatment of Karst Water of Jinmen Tunnel During Construction
Authors: Xiaobo Li , Shun Yu , Jiong Zhu
Published: March 2020

Jinmen tunnel passes through the environmental nature reserve. In the process of construction, many karst caves are exposed and a large amount of water gushes from karst are encountered several times. During the treatment of water inrush, the source and characteristics of water inrush are explored, and several treatment measures such as “advance curtain grouting”, “diameter backward grouting” and “anti water pressure lining” are taken. The engineering practice shows that the treatment technology of karst water inrush adopted by the project is practical and effective, which has certain reference significance for the tunnel construction under the condition of rich karst water inrush.
Monitoring Study on CO and Dust Diffusion in High Altitude Tunnel under Blasting Operation
Authors: Zou Zongliang , Hu Xuebing , Yuan Ye , Chen Jianzhong
Published: March 2020

In the high altitude area, the air density and the air pressure are low. CO and dust diffusion in tunnel construction have special rules. In this paper, combined with a high altitude tunnel engineering in Tibet, CO and dust diffusion during blasting operation was monitored, and diffusion situation before adopting treatment measures was compared with that after adopting treatment measures. The result shows concentration of CO and dust produced by blasting operations is high, which is more likely to cause damage to operators in areas with thin oxygen at high altitudes. Therefore, necessary treatment measures should be taken. In the longitudinal direction, the change rule of the CO and dust are totally the same. With the increase of distance from tunnel face, dust concentration declines gradually. In the range of 100m∼500m from tunnel face, the disadvantage effect of blasting is little. In this project, CO and dust concentration are reduced to a certain extent after the measures of strengthening ventilation and dust removal by water curtain are adopted.
Research Progress on Smoke Control Technology for Highway Tunnel Fire
Authors: Xia Fengyong , Yang Yuxuan
Published: March 2020

Fire is one of the biggest threats to the safe operation of highway tunnels, which will not only damage the tunnel structure, but also seriously threaten the people’s lives and property. As a key link of tunnel fire rescue, ventilation and smoke control directly affects the development trend and hazard consequences of fire. Based on the previous research results, this paper introduces the characteristics of highway tunnel fire, the methods and characteristics of ventilation and smoke exhaust, the influence of tunnel structure, and fire extinguishing methods, which has certain reference and guiding significance for the design of fire ventilation and smoke exhaust, the personnel evacuation and emergency rescue in the highway tunnel.
Research on the Decision-making Model of Value Information Selection in the Context of Big Data
Authors: Dai Daqi
Published: March 2020

Data filtering is the first step in the utilization and development of big data, that is, obtaining value data from massive data resources, building system operation database, and realizing the mining and sorting of value data. However, restricted by the infinite big data environment and limited data acquisition ability, almost no technology can obtain all the value data. In this paper, a series of indicators are proposed to evaluate and enhance the data filtering algorithm.
The Current Situation of Computer-aided Translation and its Application
Authors: Liu Xianjun
Published: March 2020

Based on 631 articles about “computer-aided translation” collected in CNKI from 1988 to 2019, this paper makes statistical analysis on teaching by drawing keyword co-occurrence network with relevant software. Translation technology, translation software and their applications are summarized. On this basis, some suggestions are put forward for the future research of cat.
Research on the Hybrid Teaching Method of College English Online and Offline based on Mobile Terminal
Authors: Huang Jiqun
Published: March 2020

English is an Indo European Germanic language. It is made up of 26 letters. The English alphabet originates from the Latin alphabet, while the Latin alphabet comes from the Greek alphabet and the Greek letters are from Phoenician letters. It is also a broadly adopted language in the overall world. English includes around 490000 words, plus around 300000 technical terms. It has the largest vocabulary. Also it is the official language of many states, for example the European Union, many international organizations and Commonwealth countries.
Research on Online Learning Curriculum in the Context of Big Data
Authors: Mu Sirong
Published: March 2020

With the development of information technology, it is possible to extract and apply big data, and it is also the first time that the samples and the whole of scientific research are combined and become the same concept. This study takes big data as the starting point, and deeply discusses the key and difficult problems of Freshmen in the process of online audio-visual. The conclusion is conducive to the smooth progress of online audio-visual curriculum reform, and also has certain guiding significance for students’ learning and teachers’ guidance.
Innovation of Agricultural Products Trace-ability System in Internet + Eco Agriculture
Authors: Zheng Yanbing , Cong Yongzhu , Jiang Shuai , Yang Zenghua , Cui Zhendong
Published: March 2020

With the rapid development of economy and the continuous improvement of people’s living standards, the Chinese dream of building a moderately prosperous society in 2020 will come true. At present, people’s concept and pursuit are also changing imperceptibly. It is especially obvious in people’s normal consumption of agricultural products. People are not worried about basic food and clothing problems, but more about the pursuit of “green, safety and health” of food quality. As China is a large agricultural country, there are many kinds of agricultural products, many employees selling agricultural products, weak awareness of agricultural product safety, blind pursuit of immediate interests, interest edification, and weak legal knowledge. With the rapid development of Internet technology, it is an inevitable trend to combine the Internet with the security of traditional agricultural products. Therefore, it is necessary to establish a set of agricultural product tracking and tracing system based on RFID technology in the Internet + era. Through the traceability system of agricultural products, the production records can be stored and the flow direction of products can be traced.
Application of Big Data in Water Ecological Environment Monitoring
Authors: Ma Huanchun , Xiong Ying , Hou Xin , Shu Qiaosheng
Published: March 2020

Water ecological data is an important part of national geographic information data and an important reference data to protect national environmental protection. China’s water ecological data has a long history, but historical reasons also lead to a certain lag in the management of water ecological data. In this paper, some problems of water ecological data are found in the research of AHP, and the corresponding countermeasures are put forward. It is believed that in the near future, water ecological data will be further supported by big data technology for in-depth data mining, so that its application scenarios are more, and it can better guide national construction.
Research on the Whole Process Engineering Consulting Service of Risk Sharing based on CIM Reward Model
Authors: Ying Danlei , Wang Libin
Published: March 2020

In order to fully study the CIM reward model risk sharing process of the whole process of engineering consulting services, this paper analyzes the three common outsourcing modes of engineering consulting by AHP, and analyzes the work flow by black box data flow. Finally, this paper believes that the policy analysis and case study of response engineering should be strengthened before the risk analysis of specific projects under CIM reward model can be made.
RETRACTED: Design Method of English Education Informationization Platform Based on 5G
Authors: Ou Guofang
Published: March 2020

In recent years, when carrying out educational activities, modern information technology and Internet technology have been integrated with each other to form a variety of educational information platforms, which have gradually replaced the traditional education and teaching methods. Using Internet thinking to improve the application level of education informatization is helpful to improve the quality of education and is of great significance to comprehensively promote the quality education of students. English is an important subject in student learning activities. English learning can improve the comprehensive ability of students, promote the healthy development of students, and enable students to better meet the needs of society. In order to improve learning efficiency, optimize the learning platform, and meet the needs of users, it is imperative to establish a 5G English education information platform. 80% of people in the current society are expecting the arrival of 5G platforms. Considering that in a high-density scenario, the number of terminals is large and the traffic is intensive. If the event scheduling method is still used to process data packets, there will be problems of too many event generations and too long processing time. Computing packet processing architecture. This architecture divides the time axis into multiple time slots. Based on the length and generation time of each data packet, the source terminal number of each data packet is mapped to the corresponding time slot position. By calculating the effective signals and interference in each time slot The strength of the signal is used to obtain performance indicators such as system capacity and throughput.
Application of Data Mining in Cultivation of Student Mental Health
Authors: Qin Huanchang , Wu Zaiqun , Wang Meisuo
Published: March 2020

Under the education concept of new era, colleges and universities need to focus on cultivation of students’ mental health besides the necessary quality education. Effective planning and decision-making of mental health education help students establish correct outlook on life and values, with great significance on their comprehensive development. With the rapid development of science and technology, data mining technology has been gradually applied to cultivation of students’ mental health. The work focused on the application of data mining in mental health education of students. Through rational application of data mining technology, the current models of mental health education for college students were further improved to provide reference for future mental health education.