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Li Z.Q.,CAS Institute of Geology and Geophysics | Li Z.Q.,China University of Mining and Technology | Li Z.Q.,Chengdu University of Technology | Li Z.Q.,China Institute of Water Resources and Hydropower Research | And 4 more authors.
Bulletin of Engineering Geology and the Environment | Year: 2014

The largest coal bunker in China will be built in the Dong Loutian loess region to store coal, and the long V-shaped loess slope of the bunker, more than 60 m in depth, will be excavated. The finite element method of numerical simulation is applied (using linear elastic and hardening soil models) to simulate stability of the excavation slope and deformation with and without reinforcement, with a view to predict the deformation trend, design the reinforcement scheme, decrease the unrealistically large heave at the base of excavation and horizontal displacement of the excavation slope, and ensure the safety of the project. The simulation results show that the stress field redistributes after excavation and reinforcement, and the horizontal displacement of the slope is inhibited effectively, while the soil at the base of the bunker should be emphatically compacted and supported by piles. The field-measured data are in better agreement with the results calculated from the hardening-soil model and the combined support mode of anchor and soil nail. Thus, the results can be used to determine the key deformation range and reinforcing areas for engineering design. © 2014, Springer-Verlag Berlin Heidelberg. Source


Zhou Z.-J.,Changan University | Niu Y.,Changan University | Zhang T.-Z.,Yunnan Highway Development and Investment Co.
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2013

The glide of simple heterogeneous rock slope was taken as research object, a mechanical model based on Sarma method was built. According to the static equilibrium condition of rock slope block, the relationship between critical acceleration coefficient and lateral normal pressure was got. The formula of critical acceleration coefficient was deduced, and the safety stability factor of slope under the condition of seismic intensity was got. The function relationship between safety stability factor and critical acceleration coefficient was analyzed, and the traditional Sarma method was improved by using the function relationship. Calculation result shows that the function relationship between safety stability factor and critical acceleration coefficient is monotone decreasing. Compared with the traditional Sarma method, the improved Sarma method does not need iteration, and does not exist convergence problem. The calculation number of example is only 6, and the calculation result meets requirement. Source


Ming X.,Yunnan Highway Development and Investment Co.
Applied Mechanics and Materials | Year: 2014

The freeway emergency management is an important way to response the emergencies timely and to reduce the losses of personnel and property. In this paper, the freeway emergency management is made as a research object to analyze the insufficient of the existing freeway emergency management and explain the freeway emergency management system's function and data management, then by the GIS platform in the treatment of emergency, proposes the freeway emergency management system based on Geographic Information Systems (GIS). Finally, by using the concrete example in the freeway command, the feasibility and the validity of the system are justified. © (2014) Trans Tech Publications, Switzerland. Source


Liu H.,Chinese Research Institute of Highway | Wang F.,Chinese Research Institute of Highway | Shen T.,Yunnan Highway Development and Investment Co. | Zhang W.,Chinese Research Institute of Highway
ICCTP 2010: Integrated Transportation Systems: Green, Intelligent, Reliable - Proceedings of the 10th International Conference of Chinese Transportation Professionals | Year: 2010

In order to determine a reasonable length for left-turn lanes, we observed vehicles' speeds on a selected left-turn lane set up with a new concept on a second-class highway and obtained speed data of a normal section, main lane taper start point and split point. Then, we analyzed the data by means of descriptive statistics analysis, the paired-samples T test and ANOVA. The results showed that the length of a left-turn lane could be shorter without compromising comfort and safety. The speed used to determine the length of main lane taper could be reduced by 5%, and the speed used to determine the deceleration length could be reduced by 15%. © 2010 ASCE. Source


Wu G.L.,Yunnan Highway Development and Investment Co. | Yang Q.J.,Guizhou Traffic Construction Engineering Quality Supervision Bureau | Gao W.J.,State Key Laboratory of Bridge Structural Dynamics
Applied Mechanics and Materials | Year: 2013

The Longjiang Bridge is a kilometer level suspension bridge supported by reinforced concrete towers. The towers will be founded on pile group foundation, and the project area is in a mountain region of high earthquake probability. Two seismic schemes were designed for the bridge, and two computational bridge models in full size were established, extensive studies were performed to capture the seismic response of different schemes for the earthquakes. The results show that towers composed of two curved quadrilateral hollow concrete columns are adopted for the bridge. © (2013) Trans Tech Publications, Switzerland. Source

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