bluuebunny/crossref_metadata_2025 huggingface dataset:
Standardized Design and Performance Analysis of Prefabricated Construction Temporary Road
Authors: Jin-ming Yin , yi Jiang , xiao-jin dong
Published: July 2020

To promote the standardization and assembly of temporary roads for construction, according to the investigation and research, combined with the requirements of the code, from the perspective of bearing capacity and economy, a standardized construction temporary road scheme was proposed. The load and temperature stresses of assembled panels of different sizes were analyzed using the elastic ground plate theory. The load stress is significantly affected by the axle load of vehicle, and the temperature stress is significantly affected by the plate length. Plate length should not exceed 4m. The numerical analysis method was adopted and the joints were optimized. The tenon could effectively transfer the load. While the length of the tenon is 4cm, the load transfer effect is the best.
Research on dam leakage detection based on visual and acoustic integration: a case study of CFRD
Authors: Tan Jiexiong , Wang Mixue , Tian Jinzhang , Xu Yi , Zhu Yantao , Huang Lixian
Published: July 2020

Many safety issues can arise during the long operation time of dams because of various internal and external factors, among which dam leakage problems happen frequently. Dam leakage not only affects the normal functions of a dam, such as power generation, water supply, and irrigation, but also weakens the flood control ability of the structure and increases the risk of dam failure. According to the existing problems in concrete face rockfill dam(CFRD) leakage detection, an integrated leakage detection technology is proposed in this paper. The proposed technology can analyze the dam safety monitoring data and then combine the high-precision sonar and underwater robot detection to provide solutions for dam leakage problems.
An improved displacement based seismic design method of prestressed fabricated concrete frame
Authors: Wang Chenchen , Xu Hongjun , Zhang Jindong
Published: July 2020

Due to the randomness of ground motion and the variation of the material itself, it is unreasonable to regard the inter-layer target displacement angle of the structure as a certain amount in the direct displacement-based seismic design. In this paper, an improved displacement seismic design method is proposed, which is characterized by: (1)Considering the reliability when determining the target displacement angle between layers, and combining the probability characteristics of the target displacement angle between layers, the seismic design of the structure has a certain probability meaning.(2)According to the quantitative relationship between damage index and displacement ductility, combining structural damage performance target, the displacement ductility of the structure is determined by the damage index in the displacement-based design method, and the determination of displacement ductility is directly related to the damage performance target. Finally, it is applied to the design of prestressed precast concrete frame structure, then OpenSees modeling is used to verify the improved displacement design method, and at the same time compared with the original design method. The results show that the improved displacement seismic design method proposed in this paper can well control the elastoplastic response of the structure and meet the performance of the structure. The original displacement design method is more conservative than the improved displacement seismic design method.
Analysis of Mutual Influence on Blasting Construction of Urban Shallow-buried Small Spacing Tunnels
Authors: Wu Yong , Dai Yichang , Wang Shuaishuai , Wu Bo , Xu Shixiang , Wei Han
Published: July 2020

Relying on the ten-mark project of Fuzhou Rail Transit Line 2, after the right-line tunnel was excavated for 25m, the left-line tunnel was excavated, and the three-dimensional tunnel calculation model was established by the finite element analysis software Ls-dyna. The stress of the right-line tunnel lining, the ground vibration velocity and the vibration velocity of the right-line tunnel were analyzed to evaluate the influence of the left-line blasting excavation on the right-line tunnel, and verified with the on-site monitoring data. The results showed that when the maximum dose of single hole was 2kg, the left tunnel blasting excavation analysis was carried out when the minimum spacing of the two tunnels was 1.6m, the maximum stress generated on the right tunnel was 2.762MPa, The maximum stress generated on the right-line tunnel was 2.762 MPa, which had exceeded the tensile strength of the concrete; the maximum vibration velocity generated on the ground at the top of the left-hand tunnel was 13cm/s, which exceeded the relevant control requirements; the maximum vibration velocity generated by the right arch waist was 32cm/s, which had a great influence on the right-line tunnel.
Cloud platform-based real-time supervision to safety inspection of hydraulic engineering metallic structures and equipments
Authors: Qin Yongkun , Liu Wanggen , Jin Keli , Liu Yuan , Qiu Zhihai , Chen Yaping , Zhou Dan , Li Yan
Published: July 2020

The safety inspection network of hydraulic engineering metallic structures and equipments was developed based on the Cloud platform technology. The experimental inspections of metallic structures in terms of the coating thickness, metal substrate thickness, welding defect and the structure stress were conducted in the under-constructed hydraulic projects in Shenzhen City. The results showed that the manual inspection data of the coating and metal thickness and the non-destructive testing scene photos and results can be transmitted to the cloud platform in real time through semi-automatic mode. Differently, the dynamic variation value of structure stress is automatically collected by the intelligent acquisition module and then wirelessly transmitted to the Cloud platform. By granting access rights to relevant personnel of quality and safety supervision department, they can ensure real-time supervision of safety inspection results and receive alarm information.
Low salinity area in the bottom layer of Jiaozhou Bay mouth
Authors: Yang Dongfang , Li Haixia , Yang Danfeng , Wang Qi , Zhang Longlei
Published: July 2020

Based on the investigation data of Jiaozhou Bay in May and October of 1979, the content and distribution of salinity in bottom layer in Jiaozhou Bay were studied. The results showed that in May and October, the variation range of salinity in Jiaozhou Bay water was 31.09-31.55 %o, and the salinity of sea water was over 31.09 %o. This showed that in the aspect of salinity change, in May and October, in the whole bottom layer of Jiaozhou Bay, the salinity of water body was relatively high. In May, in the bottom, the variation range of salinity in Jiaozhou Bay was 31.49-31.55 %o, and the salinity of sea water was relatively high. There was a low salinity area in the bottom of Jiaozhou Bay mouth. In the inner and outer waters of the bay mouth, the salinity was higher. The results showed that the salinity in Jiaozhou Bay was high and the salinity of the water outside the bay was high. In October, in the bottom layer, the variation range of salinity in Jiaozhou Bay was 31.09-31.21 %o, and the salinity of sea water was relatively low. There was a low salinity area in the bottom water outside the mouth of Jiaozhou Bay. Compared with the bay mouth and the water inside the bay mouth, the salinity of the water outside the bay mouth was relatively low, and the interval length of salinity change was 0.12 %o, and the salinity change from the outside of the bay mouth to the inside of the bay mouth was relatively small. In May, a low salinity area appeared in the bottom of Jiaozhou Bay mouth. In the inner and outer waters, the salinity was higher. In October, a series of decreasing parallel lines with different gradients were formed from the bottom high salinity water area in the inner side of the bay mouth to the bottom low salinity water area in the outerside of the bay mouth.
COMPARATIVELY STUDY WATER SENSITIVITY INDEX of the WINTER WHEAT for DIFFERENT GROUNDWATER DEPTH in SHAJIANG BLACK SOIL AREA and YELLOW FLUVO-ACQUIC SOIL AREA
Authors: Wang Zhenlong , Lei Ming , Zhu Mei , Zhu Lingling , Wang Yining
Published: July 2020

Winter wheat which was a typical dry crop in the Huaibei Plain was studied in the paper through the Wudaogou Hydrology and Water Resources Experimental Station, the long sequence of the lysimeter and the uninterrupted special experimental data. The multilevel water table depth was controlled from 0-5m in the experiments. By modeling the crop-water production function (Jensen Model), the tendency and regularity of the moisture sensitivity index variations of winter wheat cultivated was investigated under the above conditions at different plant developmental stages. The results showed that water deficits have greatly impacted winter wheat yield during key reproductive and seed formation periods, which are in the context of this analysis, the heading - maturation stage. Returning to green - jointing periods, the range of sensitivity to water deficits is 46.1% to 61.3%, which is the period towards maturation and 8.5% - 15.3% for the tillering period and overwintering period in maximum. The water sensitivity indexes reaches the maximum at the 1.0m ground water depth in the Shajiang black soil and Yellow fluvo-acquatic soil, which yields a 1.58 - 2.45 times and 1.16 - 2.08 times increase compared to the minimum in the same growth period. The groundwater depth should therefore be maintained between 0.8m and 1.2m in Shajiang black soil and Yellow fluvo-acquic soil. In comparison to other groundwater depths, this can reduce artificial irrigation and the occurrence of either waterlogging events or requisite drainage measures. Therefore, the findings of this study can optimize irrigation and improve water use efficiency.
Water Pollution Control and Ecological Restoration of Urban Lake Landscape
Authors: Cao Yuanping
Published: July 2020

Under the background of ecological civilization, the landscape construction of inner lake meets the needs of people’s good life to some extent. However, in recent years, the landscape water body of our city is affected by itself and its surrounding environment, and eutrophication, blackening and frequent peculiar smell of water seriously affect the quality of urban ecological environment and residents’ living environment. This paper introduces and analyzes the application of water pollution control and ecological restoration technology in Pantang Park, Wuzhou City, in order to provide reference for water pollution control of small rivers and lakes.
A study on the assessment of the resilience of agricultural system under flood disaster
Authors: Song Liangliang , Li Ying , Long Rui , Tong Linchen , Zhang Jinghe , Zhu Xinuo
Published: July 2020

In order to further understand the flood control and disaster resistance ability of agricultural system, the concept of resilience of agricultural system under flood and waterlogging disaster is given. From four aspects of technology, economy, environment and society, the most representative eight evaluation indexes are selected to build the resilience model of agricultural system under flood disaster, determine the grade standard of each index, introduce TOPSIS method and adopt “two-level empowerment” to quantify the resilience of agricultural system under flood disaster. Taking 13 cities in Jiangsu Province as an example, this paper uses the TOPSIS based assessment model to assess the resilience of agricultural system under flood and waterlogging disasters, and the assessment results are consistent with the actual situation.
The analysis of sea(salt) water intrusion in Weibei-plane of Shandong
Authors: Qin Peng , Liu Hongliang , Yang Peng , Liu Yanfen , Shang Tingting
Published: July 2020

Based on the environmental geological survey, sample test and hydrogeological survey, this paper makes a systematic analysis on the source, formation, weather, topography and hydrogeology of sea water (salt) intrusion, and analyzes the plane sea water (salt) intrusion in the north of Wei River.
which are the key factors influencing real estate development mode? Empirical analysis based on a group of data from china
Authors: Xinli Zhang , Ye Tian , linlin Liu , Sihan Li
Published: July 2020

According to the profitability evolution of real estate development projects, it is necessary and meaningful to conduct an analysis of the development mode of the real estate using some quantitative and empirical methods. To achieve this goal, a full-cycle index model (FCIM) of real estate development and construction investment is used to generate a series of data at first, which includes 40 samples (key factors) with their internal rate of return (IRR) of what as the output and 38 influencing factors as the input. In addition, three strategies (i.e., correlation, representativeness of dimensions and bottom of factors) are applied to filter the sample data and thus getting 10 key influencing factors of the IRR. Then, a regression model that treats IRR as the output and key influencing factors as the input is constructed to determine the weights of these factors. Finally, multiple combinations of factors with higher weights are considered to lead to the innovation basis for the real estate development mode. In conclusion, three factors have the strongest impacts on IRR: land transfer fee, sales promotion, and stamp tax and three development modes referring to different real estate enterprises are summarized, which are L&H Mode, L&P Mode, and H&B Mode.
Ecological risk assessment of heavy metals in soils around mining area: comparison of different assessment methods
Authors: Na Wang
Published: July 2020

The farmland soil around the mercury mining area of Xunyang mansion was investigated and analyzed, and different methods were used to evaluate the soil. The results show that the contents of chromium, nickel, cadmium and mercury in Gongguan mercury mining area are 97-1113 mg / kg, 76-601 mg / kg, 0.415-1.458 mg / kg, 1.050-5.273 mg / kg, all of which exceed the standard values. The results show that the mercury pollution in Gongguan mercury mining area is extremely serious; the Nemero pollution index method shows that the soil near the Gongguan mercury mining area has been polluted in different degrees, and the crops near the mining area have the tendency to pollute heavy metals; the potential ecological risk index method shows that the heavy metal mercury in Gongguan mercury mining area presents a very strong risk level. The evaluation results of different evaluation methods are quite different. Therefore, in the follow-up evaluation, the appropriate evaluation method should be selected according to the purpose of evaluation.
Research on Rural Public Space Reconstruction for the aged from the Perspective of Community Endowment—Taking Jinqiao village in Fengyang as an Example
Authors: Li Li , Lantao Wei
Published: July 2020

The emergence of urban-rural dual structure and the increasingly serious problem of rural aging are inevitable results in the process of urbanization. It will play a very important role to improve pension infrastructure to meet the new demand for rural aging. Taking Jinqiao Village, Fengyang County, Anhui Province of P. R. of China as an example, the importance of communication space, cultural space and healthcare space as the main activity areas for the aged has been explored according to their family status, psychological characteristics, residence and behavior habits. The design and analysis of the public pension activity space and facilities of the village are carried out from the angle of “convenience”, “culture” and “security”. The strategy of improving and optimizing the reconstruction of rural pension space is put forward.
The Application of New Materials in Zhujiajiao Art Architecture
Authors: Chen Hongyu , Feng Guojian
Published: July 2020

Zhujiajiao’s artistic architecture, as an artistic architecture using new materials in Shanghai, has aroused the research of many scholars at home and abroad. This article takes the design of Zhujiajiao Art Center as the starting point, and explores the material function, functional division, and art evaluation of the art building. Functional evaluation of the building’s field experiments and post-use evaluation of its material performance. It is explored that architecture is the carrier of experience. In space organization, how to express complete design skills in design works is the direction of our further research and the meaning of this article.
A Research on the Architectural Design and its Implementing of Dong Nationality in Northern Guangxi
Authors: Lu Xiaoying , Wei Yanhai , Hu Xueka , Fang Jiajue
Published: July 2020

The traditional architecture of national minorities is the phenomenon of national culture. Under the long history of history, each nation has a unique traditional architectural design and style. They are the treasures of Chinese nation. Dong architecture is one of the most classic type in Chinese minority architecture. Dong people take advantages of their natural and geographical conditionals to build unique all-wood architecture. Its unique architectural design is the embodiment of traditional Chinese excellent cultural heritage and the carrier of humanistic spirit. This paper mainly takes the Dong architectures in northern Guangxi as research objects, by analyzing the architecture modeling, inner building structures and building materials of the drum building, the wind and rain bridge and the dry-column style residential building, to display the creation of Dong architectural mode, and hope to provide some practical experiences for the construction of buildings with certain national characteristics.
Theoretical Analysis on Soil Pressure Acting on End-Suspended Pile Supporting Structure to Foundation Pit in Soil-Rock Mixed Stratum
Authors: Liu Mingzhu , Li Shengli , Wang Shijie
Published: July 2020

By taking Sanshandao Gold Mine Foundation Pit Supporting Project as an example, targeting at the end-suspended pile supporting structure applied in soil-rock mixed stratum common in mountainous and hilly area, this paper introduces unified strength theory and revised Hoek-Brown strength criterion to calculate and analyze active soil pressure, passive soil resistance and overall stability of supporting structure, during which not only the influence of intermediate principal stress, but also the influence of structural surface, weathering degree and disturbing degree of the rock can be taken into consideration. Therefore, theoretically speaking, it is much more scientific than traditional soil pressure theory, and the results are closer to actual engineering properties, thus being of critical theoretical significance and engineering reference value to perfecting design calculation theory of end-suspended pile supporting structure and optimizing design of foundation pit supporting structure.
Experimental study on vertical bearing capacity of pile foundation in east Gansu Province loess area
Authors: Wang Jinxi , Zhang Binwei , Yang Yang
Published: July 2020

To explore the vertical bearing capacity of pile foundations in the loess area, relying on the new construction project, a single pile vertical compressive bearing capacity field test was conducted on three test piles, and the Q-S curve and S-lgt curve of the single pile vertical static load test The analysis and research showed that the axial force of the three test piles had not been transmitted to the pile end, and the load was mainly borne by the reaction force provided by the frictional resistance of the pile side. The distribution of the axial force of the pile with depth is not only related to the size of the pile top load, but the nature of the soil around the pile is related to the typical friction pile characteristics, and the Q-S curves all show a slow-change type with no obvious steep drop. When loading 4900kN, none of them reached the ultimate failure, and the settlements of the three trial-installed piles were 12.24, 15.44 and 18.64mm, respectively. By comparing the test results with the design requirements, the bearing capacity of the single pile meets the requirements, indicating that in the loess area, the single pile has a higher bearing capacity, and the settlement is more uniform and the settlement is small, which can be used as a building foundation to bear a larger load.
Study on the role of cushion of composite ground and the choice of its depth
Authors: Liu Liping , Li Ping , Du Ting
Published: July 2020

Cushion design on CFG pile composite foundation is an important part of CFG pile. Through theoretical analysis, the mechanism of cushion improving composite foundation is obtained, and the relationship curve of cushion thickness, modulus, pile-soil stress ratio, length of negative friction zone and settlement is analyzed, so as to provide basis for cushion thickness design of CFG pile composite foundation.
Discussion of Some New Trends in Mechanics and Engineering Research of Collapsible Loess
Authors: Li Ping , Dong Yunxiu , Liu Liping
Published: July 2020

A brief introduction is provided on the overall trend of the global-wide research on loess distribution in China and the collapsible reasons of collapsible loess. Recent achievements are discussed as well as basic properties and engineering research status of collapsible loess. The future some new research direction is also presented.
Practical Method for Calculating Settlement of underlying stratum in composite ground
Authors: You Jinglin , Li Shengli , Liu Mingzhu , Wang Shijie
Published: July 2020

In the current settlement calculation methods of composite ground, there are considerable discrepancies between calculating data and measuring data. Based on Mindlin displacement solution, a simple and practical approach is presented for the calculation of settlement of underlying stratum of the reinforced area in composite ground. According to this method, the calculated result agrees well with measured data.
Static Stability of Derrick with Double Flat Arm
Authors: Liao Yun , Lin Guanglong , Wang Dehong , Li Wenbin , Ye Huawei , Hua Cheng , Ma Chi , Zhu Jinlin , Dong Qi , Ju Yanzhong
Published: July 2020

In order to investigate the stability of a derrick under wind load, a floor type double flat arm derrick is selected as the object, and the numerical simulation method is applied for the eigenvalue buckling analysis and the nonlinear stability analysis to get the instability mode and the critical wind speed in static stability. The results show that the position where the derrick first buckles is the connection between the derrick and the flat arm, and finally the torsional instability leads to the overall instability. The instability of the derrick without waist ring is caused by the damage of the main material of the tower leg. The mean wind speed in static instability is 56 m/s.
Discussion on the application of alcohol combustion method in the determination of soil moisture content
Authors: Liang Xinning , Hu Fangtao
Published: July 2020

Moisture content is a very important parameter in earthwork filling. In the process of earthwork compaction, the moisture content of the compacted soil shall be measured in time, and the moisture content shall be compared with the design requirements to check whether it is qualified. However, the conventional drying method usually takes about 6 to 8 hours, which will have a great impact on the construction progress. Therefore, this paper mainly discusses the alcohol combustion method in the construction site to temporarily replace the drying method to determine the moisture content of soil. The optimum sampling quantity, combustion times and the range of moisture content of alcohol combustion method are obtained. Finally, it shows the accuracy of alcohol combustion method in the temporary determination of soil moisture content in the construction site.
Research on the structure type of emergency rescue station in super-long railway tunnel
Authors: Li Qi , Xiong Xiaoling , Wang Mingnian , Cao Xiongzhi , Luo Xinyu , Yang Chang
Published: July 2020

In order to ensure the safety of rescue and evacuation of super-long railway tunnel (longer than 20km), an emergency rescue station is generally set up. Through the research on the structure types of the railway tunnel and the railway tunnel group emergency rescue stations at home and abroad, the paper finds out the types of the emergency rescue stations and the advantages and disadvantages of different structural types. Conclusion are as follows,| Super-long railway tunnels in European countries, Japan and China generally adopt the form of double holes. Super-long railway tunnels generally use a single hole in China.| There are six types of structure of railway tunnel emergency rescue station: general encryption transverse channel type, horizontal guide type on both sides, single side flat guide type, refuge space type, encrypted horizontal channel type at the entrance and auxiliary tunnel type at the entrance.
Research on mechanical performance of crushed stones by large-scale triaxial shear tests
Authors: Li Jingshuang
Published: July 2020

Crushed stones were used as furrowed subgrade in recent project. Triaxial shear tests were carried out on selected crushed stone with the gradation of 20 mm to 40 mm. The dry densities of specimens were controlled to be 1.450 g/cm3, 1.600 g/cm3 and 1.721 g/cm3, respectively. Test results show that the constitutive relationship conforms to hyperbola, which can be simulated by Duncan-Chang model. At lower stress level, the crushed stones show slight dilatancy, while at the higher stress level, the crushed stones show shear shrinkage. The shear strength is nonlinear with an interlocking force between aggregates. A linear relation is proposed to describe the variation of angel of internal friction.
Application of BIM + big data in the whole life cycle of engineering project
Authors: Wu Lihua
Published: July 2020

Green, healthy and sustainable development has always been the goal of engineering construction enterprises, which is consistent with the national green environmental protection policy. The application of BIM + big data in engineering construction can effectively help solve problems such as pipeline collision in engineering design, schedule cost control in construction, poor communication and coordination. Its application improves the construction quality and management level, and supports the sustainable development of construction enterprises. This paper first expounds BIM + big data technology, then analyses the application and effect of BIM + big data in each stage of engineering construction, and puts forward some suggestions for the current development status, which has certain practical reference value.
Experimental study on generation discharge mismatch between the Three Gorges and Gezhouba
Authors: Li Zhijing , Zhou Caijin , Li Dazhi , Sun Guizhou
Published: July 2020

Due to the design reasons, the maximum generation flow of the Three Gorges hydropower station does not match the over flow of Gezhouba hydropower station, especially the discharge at peak load in flood season will greatly exceed the full output flow of Gezhouba hydropower station. The excess flow of Gezhouba needs to be discharged from the flood discharge dam section. The potential energy is not converted into electric energy, but directly converted into kinetic energy. The discharge flow velocity is large, which may affect the scour of the downstream reach of the dam. In order to reveal the influence of Gezhouba power plant waste water on the scour of the lower reaches of Gezhouba, this paper carried out a model test study of Gezhouba waste water under the condition that the power generation flow of the Three Gorges and Gezhouba does not match, and analyzed the law of the change of the downstream flow pattern under different waste water conditions of Gezhouba. The results show that the decrease of the abandoned water flow of Gezhouba can help to reduce the flow velocity near the dam downstream, while the influence of the change of the abandoned water flow on the scour downstream is limited.
Application Study of Univariate Linear Regression Model in Seepage Pressure Analysis of Earth Dam Taking Dongzhen Reservoir in Fujian Province as an Example
Authors: Tian Hui , Qin Genquan , Liao Chengwei , Lin Ping
Published: July 2020

Based on the typical non-deterministic relationship between the seepage pressure of the earth dam and the upstream water level, this paper proposes a method for establishing a linear regression model for seepage pressure analysis of the earth dam; Taking the Dongzhen Reservoir Dam as an example, two historical data representing osmometers BS3 and BS4 were selected for simulation application, and the reliability test of the regression model was carried out using the correlation coefficient test method. The results showed that the correlation coefficients of the reservoir water level and the seepage pressure monitoring values were 0.911 and 0.850, respectively, and the correlations were good and in accordance with the normal law; By applying the prediction and control functions of the built model, the prediction interval of the monitoring results of the osmometer at different reservoir water levels and the safe variation range of the reservoir water level at different seepage pressure values are obtained. Subsequently, the model was used to analyze and verify the data of all 29 piezometers in Dongzhen Reservoir, and the attribution analysis of the relevant differences.
Research on Construction and Restoration Technology of Modern Historical Buildings
Authors: Lei Luo , Yong fa Wu
Published: July 2020

As an ancient civilization, China still has a lot of historical remains, but many historical buildings have been damaged to a certain extent during long-term use, and the safety of the buildings is difficult to guarantee. In response to this problem, it is necessary for relevant cultural departments to do a good job in the construction and restoration of historical buildings, and to highlight the cultural connotation of these buildings.
Study on Multi-level Microstructure of Plant Fiber
Authors: Zhang WX , Yang LM
Published: July 2020

Compared with common artificial fibers, plant fibers have advantages of lower density, high strength, low cost, and they can be more easily extracted from plants. Thus, they are ideal reinforced materials to the development of high performance composite materials. Based on the existing research results of the applicant, we develop a kind of Hamiltonian system based boundary integral numerical model to analyse the micro mechanical properties of multi-level structure of plant fibers and its reinforced polymer composites. Using the microscopic observation and micro tensile test to determine the longitudinal mechanical parameters of plant fiber composite material and the lateral scale of the component materials, so that a multi-level micro mechanical model can be established.
Study on Vibration of Flexible Beams with Interior Fluid
Authors: Zhang WX , Yang LM
Published: July 2020

In this paper, the basic governing equations of nonlinear dynamics of solid-liquid coupling system are established. Without considering the free vibration, according to the characteristic polynomial of the Jacobi matrix of the disturbance equation required by the Hopf bifurcation, the algebraic equations that the critical velocity must meet are derived. The numerical results show that when the velocity exceeds the critical value, the vibration amplitude of the beam jumps obviously.
Study on reflection of one dimensional stress wave
Authors: Zhang WX , Chen YG
Published: July 2020

Impact load is a common form of dynamic load. Because of the time effect and the inertia and deformability of the structure, the impact load will propagate and reflect in the form of stress wave in the structure. In this paper, the form of stress wave transferred from the impact end to the structure is analyzed, and the wave equation of axial compression stress wave is derived.
Research on the Development of Green Building Industry in China
Authors: Dong Lirui
Published: July 2020

Architecture is important to people’s lives and production. However, while various buildings play an active role, the problems of environmental pollution and excessive energy consumption caused by construction are gradually emerging. If the problems are not resolved, they will have an adverse impact on people’s sustainable development. Under such circumstances, green building industry can be produced and developed. The problems of construction pollution and excessive energy consumption in China are also very serious. Under the above background, this paper has carried out research on the development of green building industry in China. In terms of specific content, this article analyzes the reasons for the development of green building industry in China, explores the development status and problems of green building industry in China, and finally puts forward some suggestions for promoting the better development of green building industry in China.
Application Analysis of Foundation Pit Monitoring Technology in Geotechnical Engineering
Authors: Li Yinghao , Yue Chuanyun , Zhao Yang
Published: July 2020

In the process of foundation pit excavation, due to the comprehensive influence of many complex factors and the fact that the theoretical predicted value cannot accurately, comprehensively and fully reflect the various changes of the project, it is particularly important to monitor the foundation pit in real time. During the construction of pile foundation and soil reinforcement, due to the damage of soil stress balance, it will have a certain adverse impact on the surrounding buildings (structures), roads and pipelines. In order to ensure the normal construction and use of the project, the surrounding buildings (structures), roads and underground pipelines should be monitored periodically, and the construction scheme should be timely adjusted according to the monitoring results.
Safety information perception, forewarning & forecast of Chinese small reservoir based on risk classification
Authors: Lu Qiling , Fang Weihua , He Qi , Wang Xue , Na Wei
Published: July 2020

In order to effectively manage more than 90000 small reservoirs in China, aiming at their characteristics, based on engineering classification, this article established a system of safety information perception, early warning and prediction based on safety risk classification in terms of the safety risk factors such as occurrence environment, structural materials, supervision and management, and accident loss. It solved the standardization and pertinence problems of small reservoir risk management in China.
Research on the Investigation Characteristics of the Re-Building Wharf Project at the Original Site
Authors: Tian-yun Liu
Published: July 2020

Taking the re-building fishing wharf project of Beira in Mozambique as an example, the investigation characteristics of the re-building wharf project at the original site are described, including the collection of the original wharf design data, the exploration of obstacles in the investigation area and the zoning statistics of the investigation results according to different regions. On the basis of the differences in different regions, the indexes such as soil indicator, vane shear strength and over-consolidation ratio should be provided by zone, so as to provide more practical parameters for the design.
Main points of emergency water source project planning in Xiantao City
Authors: Lin Xin , Du Zhehua
Published: July 2020

Emergency water source plays a vital role of reducing risks of water supply in cities. The Chinese government has paid great attention on reserve and emergency water source. They have made clear the construction time requirements. For cities with single water source, the construction of emergency water source or standby water source should be basically completed by the end of 2020. This paper summarizes the planning content of the emergency water source project in the city, and focuses on the key points of Xiantao emergency water source function positioning. The key points includes water source function identification, economic scale calculation and determine risk duration. In the original plan, the risk duration is fifteen days, the effective storage capacity of the reservoir is proposed to be 3.5 million m3. Through systematic analysis and calculation, the risk duration is ten days, the effective storage capacity of the reservoir is 2.3 million m3. The project plan is optimized and the investment is saved. It is expected to provide a guidance for planning of standby and emergency water supply system in cities.
Planning and design of Rural Complex under the background of Rural Revitalization——Taking the eastern mountainous area of Jilin province as an example
Authors: Baochang Liu
Published: July 2020

The ecological environment and natural resources in the eastern mountainous areas of Jilin Province have special and obvious advantages. From the “Rural Revitalization” strategy proposed by the 19th National Congress of the Communist Party of China to the “rural complex” proposed in the No.1 document, this paper analyses the development model and policy in domestic and international area, combined with the regional characteristics of the eastern mountainous areas in Jilin Province and the advantages of rural complex development. In order to provide reference for similar projects, the planning principles and main contents of rural complex construction in this area are discussed.
Impact of sea level rise on estuarine salt water intrusion–A numerical model study for Changjiang Estuarine
Authors: Song Zekun , Shi Weiyong , Zhang Junbiao , Yuan Di , Wu Qingsong , Wang Rusheng
Published: July 2020

A 3D and high-resolution salinity transport numerical model of Changjiang Estuary with unstructured mesh was established using the MIKE3. The salinity transport model results were tested and verified by the observed data in Changjiang Estuary, the statistics of correlation coefficient are in good values. And then, the verified salinity transport model was used to study the impact of sea level rise on saltwater intrusion in the Changjiang Estuary. The results show that the entire North Branch was flooded with high saline water and a large amount of salt water spill over from the North Branch into the South Branch, which caused the South Branch with a high-low-high saddle-shaped distribution. With the rise of sea level, salt rocks such as the North Branch, the South Branch, and the North Channel moved upstream to varying degrees, strengthening the saltwater intrusion in the eastern Changjiang River. The high saline waters from North Branch spill over into South Branch also increased. The isohaline of North Branch South Branch and North Channel move to upstream, and move downstream in South Channel, North Passage and South Passage. The high salt water from the North Branch into the South Branch increased the salinity of the upper section of the South Branch.
Characteristics of seawater intrusion in the coastal area of Weihai
Authors: Qin Peng , Li Shanhai , Liu Hongliang
Published: July 2020

Based on the comprehensive investigation, sampling and analysis of hydrogeology and environmental geology, this paper analyzes the characteristics of seawater intrusion in the coastal area of Weihai and points out the influence of human engineering activities on seawater intrusion in the area.
Study on Harmonious Identification Method and Application of Human-Water Relationship
Authors: Ke Zhou
Published: July 2020

Based on the deep mechanical analysis of human-water relationship, this paper put forward the concept of harmonious identification and carry out quantitative analysis of the harmonious relationship between two or more related parties. The contribution of different related persons to the harmonious relationship, the primary and secondary relationship, the influence of different influencing factors on the harmonious relationship and the process of the primary and secondary relationship are explored. The harmony identification methods are studied both tor modeling and non-modeling methods. It is sure that the present findings should lay a foundation for the harmonious regulation of human-water relationship.
Three-dimensional numerical simulation of water flow characteristics in wide and narrow rivers
Authors: Xueting Wang , Lijian Qi , Yun Zeng
Published: July 2020

In the mountainous area, due to the influence of the topography and the incoming water, it is easy to form a wide and narrow river channel. The water flow structure is different from the single river channel, and the change trend is related to the river channel section shape and flow. The three-dimensional numerical model is established by simulating the wide and narrow rivers in the mountainous area of Sichuan. The results show that the average cross-sectional velocity of the narrow section is positively correlated with the flow rate, but the variation is not obvious in the wide section; the shear stress of the bed surface is basically symmetrically distributed along the cross-sectional direction; the shear stress of the side wall of the narrow section is negatively correlated with the height of the side wall, and the maximum value appears on the water surface, due to the influence of the recirculation zone, the shear stress of the side wall increases firstly and then decreases with the shear height of the side wall; the shear stress of the side wall has a scouring effect on the river bank, which makes the narrow section of the river bed having a tendency to continuously cut down, and the wide section of the river bed is continuously widened.
Research on Existing Problems and Improvement Measures of Fabricated Shear Wall
Authors: Xiao Tongliang , Li Hubing , Yu Ziyang , Li Yan
Published: July 2020

When assembling the shear wall during hoisting and positioning, due to the many and dense reinforcements around the shear wall members, there are also many connection joints with other members, which makes the construction more difficult during assembly; it needs to be connected with the floor slab, too many connection joints are easy to bend the steel bar. This study proposes a shear wall positioning installation method. According to the parameters of the shear wall components, installing matching positioning braces before the components are hoisted can reduce unnecessary joint damage during the installation process and improve the efficiency of construction.
A brief review on the fabrication and mechanical behavior of functionally graded concrete materials
Authors: Liu Qiang , Zhang Huihua , Hong Ping , Han Shangyu
Published: July 2020

Functionally graded concrete materials (FGCs) are new concrete composites whose functions and properties change with the spatial position. In this paper, the research status on the fabrication and mechanical behavior of FGCs was briefly reviewed, and the next work is also summarized.
Research on the construction of stable sandcastle structure
Authors: Ma Tingyu , Wang Tao , Hu Jianshuo , Zhang Guiyong , Zhuang Yuhan , Li Jiating , Chen Jionghui
Published: July 2020

We model and analyze the optimal 3d geometry of sandcastle, discuss the optimal sand-water ratio of sandcastle, and analyze whether it is still the optimal 3d geometry in the case of rainfall. First of all, we assume that the sandcastle is a solid, the waves are fluid, through the establishment of fluid-solid interaction model, using the deformation variable of the sandcastle as indicators of sandcastle collapse or instability, and then we apply the ALE method, namely Eulerian method and LaGrange method, list the relevant differential equations by calculating the transport volume between grids, the simulation results show that the shape of semi ellipsoid is the best. At the same time, we analyze the phenomenon such as the stress on the arc slope, the movement of sand grains along the arc and the percolation during rainfall using simplified Bishop method and obtain the expression of the safety factor of the landslide in the rainfall. Through iteration, the results show that the semi ellipsoidal shape is still the best. Finally, we establish the relationship between the shear strength and water content of the foundation in the unsaturated state, and the optimal water content is calculated between the interval [1.8%, 2.1%].
Research on Anti-Crack Design of Super-Long Concrete Structure
Authors: Jiang Huihui
Published: July 2020

There are many reasons for cracks at super-long concrete, which may be due to factors such as tensile stress and temperature shrinkage. Combined with the existing research and in-depth analysis from multiple angles, the causes of mass concrete cracks and the design method of temperature post-casting zone are described. Finally, related technical suggestions and supplementary measures were also put forward. At present, the anti-crack design of super-long concrete structures is mainly based on experience. Structural measures are used. The comprehensive effect lacks check and review. Even if the maximum crack width is checked, the load effect of concrete forming and cool shrinkage is basically not combined. For different requirements, an appropriate crack controlled standard is selected, and the maximum crack width limit of concrete specifications is generally used as the upper limit.
Nano Fumed Silica Particles on Cement Properties
Authors: Li Zhi , Wang Yanmin , Wu Yanling
Published: July 2020

The hydration of cement paste is generally responsible for the development of essentially every engineering property of cement paste. The compressive strength and early hydration performance of cement mortar can be improved by adding nano silica into ordinary strength mortar, which is related to the pozzolanic properties of nano silica. Hence, this paper investigated the effects of different amounts (2%, 4% and 6%) of fumed silica on hydration and hardening of cement. The result indicates that water consumption of standard consistency of cement increases with the addition of nano fumed silica particles. In addition, with the dosage increase of fumed silica, the setting time gradually becomes shorter. It is worth noting that the setting time of slurry becomes shorter obviously when the addition amount of nano fumed silica is 2%. The result of cement sand test indicates that the addition of fumed silica reduces the strength of cement, which is related to the hydration reaction. It is suggested that nano fumed silica should be used in combination with high efficient plasticizer, which decreases the agglomeration and directly impacts kinetics of hydration and leads to improvement in workability as well as concrete strength through the increase in the formation of silicate calcium hydrate.
Study on Hydration Behavior of Cement Mortar with Nano-Metakaoline by Electrochemical Impedance Spectroscopy
Authors: Li Chuang , Fan Yingfang , Yu Jian
Published: July 2020

The hydration process of cement mortar with nano-metakaolin (NMK) for three contents (3%,5%,7%) in early hydration stage and stable hydration stage were investigated by electrochemical impedance spectroscopy (EIS). The results show that the addition of NMK can accelerate the hydration process of cement mortar with NMK in hydration early stage (1-12h) and stable hydration stage (1-28d). NMK can increase the resistance of continounous conductive path RCCP. At 28d, the RCCP of specimen with NMK contents of 3%, 5%, 7% were increased by28.7%, 43.4% and 71.1%.