Xu Z.,The 3rd Railway Survey and Design Institute Group Corporation |
Sun Y.,The 3rd Railway Survey and Design Institute Group Corporation |
Sun Y.,Southwest Jiaotong University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014
Squeezing rock refers to weak rock under high grostress, so squeezing ground conditions conclude high grostress and weak rock, it means large convergences of the tunnel walls. Squeezing ground conditions have posed and continue to pose a major obstacle to the construction of tunnels through mountains. The Yanmenguan railway links the city of Datong to Yuanping in China through the Hengshan mountains. The tunnel is 14.1km long with a two lane horse-shoe section, which is excavated in Archean plagioclase gneiss and granitic gneiss at depths of up to 820 m below surface, and extreme squeezing problems have been encountered, especially in sections of DK121+203-DK121+175. Based on analysis of engineering geological conditions, stability of surrounding rock and deformation monitoring, it is found that: (1) The sections of DK121+203-DK121+175 locate at fracture zones of ancient metamorphic rocks. (2) Rock mass quality and geostress conditions are key factors for the stability of surrounding rock. (3) Surrounding rock deformation sharply increased mainly due to excavation of middle, under bench and invert. (4) The effect is obvious to control surrounding rock deformation by strengthening the primary support and radial grouting behind primary support. ©, 2014, Academia Sinica. All right reserved.
Ge S.,Tianjin University |
Wang H.,Tianjin University |
Wang Y.,The 3rd Railway Survey and Design Institute Group Corporation |
Zhang X.,Tianjin University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012
Energy storage can smooth out the output power fluctuation of distributed generations and potentially improve the supply reliability of distribution system. To quantitatively assess the effect of energy storage, this paper proposes a pseudo-sequential Monte Carlo simulation method for reliability evaluation of distribution system including distributed wind turbines, photovoltaic arrays and batteries. The hourly sequential models and state variation models of wind turbines, photovoltaic arrays and batteries are established. On this basis, the non-power components are sampled sequentially and the components of wind turbines, photovoltaic arrays and batteries are sampled non-sequentially. The failure modes and effects analysis procedure of distribution system is discussed and the reliability evaluation flow is illustrated. Taking the modified IEEE RBTS as an example, system reliability indices in different situations are compared and analyzed, and the effectiveness of the proposed method is verified. © 2012 State Grid Electric Power Research Institute Press.
Liao L.-J.,The 3rd Railway Survey and Design Institute Group Corporation |
Wang Y.-Q.,The 3rd Railway Survey and Design Institute Group Corporation |
Jiang P.,The 3rd Railway Survey and Design Institute Group Corporation
Tiedao Xuebao/Journal of the China Railway Society | Year: 2013
When a standard-span railway bridge is designed, geologic data processing takes up a great part of time. In this paper the characteristics of the boring drawing and geological profile were analyzed by starting with batch extracting from the CAD electric drawing, the serial numbers & mileages of bored holes and elevations of soil stratum boundary points and storing them in the boring log. With the help of the log, the soil stratum boundary points were located on the geological profile and were watched with the connecting lines of bored holes. The information of the soil strata above and below the connecting lines was defined and stored in the boring log. The inversion algorithm was designed according to the geological data and the information of the soil strata at any mileage could be worked out. Applying the proposed algorithm in peak design periods of railway bridges may shorten the geologic data processing time for bridge foundation design and help to fulfill assigned tasks with good quality and quantity under adverse conditions of short construction periods and insufficient staff members. The algorithm is proved to be fast and accurate. It accomplishes jointless coordination between specialities of railway bridges and geology.
Li Y.-J.,The 3rd Railway Survey and Design Institute Group Corporation
Journal of Railway Engineering Society | Year: 2013
Research purposes: According to the functional orientation of the Beijing-Shenyang High-speed Railway in the railway network and the network plan for passenger outgoing and incoming of the Shanhai Passage, this paper systematically studies the timing of building the Beijing-Shenyang High-speed Railway through the comprehensive analysis and prediction of total passenger transportation volume of outgoing and incoming of the Shanhai Pass, the reasonable functions of various railways, the annual adaptability and transportation efficiency of existing railways and the demands of regional economic and social development. Construction of high-speed railway takes long time with the larger amount of investment, and it has the big influence on the local economic and social developments, so the decision-making process is very complicated. The adaptability analysis of the corridor and passenger traffic volume related to the railway network is the most basic data for the decision-making on the timing of building the railway, but it is not the only determining factor. In addition, the regional economic development, improvement of comprehensive efficiency of railway network and environment change caused by the construction also should be fully taken into account. The research methods and ideas on the timing of building the railway presented in this paper can be as the reference to the similar works. Research conclusions: (1) From the views of meeting the traffic demands of outgoing and incoming of the Shanhai Pass and optimizing the railway network structure, the railway construction should be complete by 2020 in order to relax the traffic pressure and improve the service quality of the passenger outgoing and incoming of the Shanhai Pass. (2) From the views of promoting the coordinated development of the regional economy and improving the construction environment, the railway construction can change the poor transport situations of Chengde, Chaoyang and Fuxin areas along the railway, develop and enrich the travel resources and maintain the closely economic exchange of Beijing and Shenyang with the surrounding areas, and it is crucial to promotion of the coordinated development of the regional economy. (3) From the view of the project's economic benefits, the two rapid passenger corridors with large traffic capacity will be formed after building the railway and they can enhance the railway network's flexibility because they have enough traffic capacity in the early days after railway building. The trains of the different grades can run to meet the demands of the different passengers to reflect the public welfare and basic features of the railway. (4) The research on the method for the timing of building the railway presented in this paper is available for planing and construction of the transportation infrastructure.