Northwest Research Institute Co. of China Railway Engineering Corporation

Lanzhou, China

Northwest Research Institute Co. of China Railway Engineering Corporation

Lanzhou, China

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Zhao Y.-H.,Northwest Research Institute Co. of China Railway Engineering Corporation | Mi W.-J.,Northwest Research Institute Co. of China Railway Engineering Corporation | Sun R.-D.,Transportation Institute | Qu Y.-H.,Northwest Research Institute Co. of China Railway Engineering Corporation | And 2 more authors.
Journal of Railway Engineering Society | Year: 2017

Research purposes: The highway culvert diseases are often occurred in collapsible loess areas. In order to solve the problems of post-construction sedimentation and large deformation of culverts caused by poor ground design in collapsible loess area, taking the two culverts of collapsible loess areas of Minhe to Xiaoxia I-grade highways in Qinghai province as examples, the actual effects of different ground treatment measures and settlement and deformation characteristics have been analyzed based on the methods of replacement and lime-loess compaction pile, to provide the reference for the application of different ground treatment methods of highway culvert in collapsible loess area. Research conclusions: (1) The methods of replacement and lime-loess compaction pile can effectively eliminate or decrease the collapsible deformation of culvert ground caused by soaking and improve the bearing capacity of culvert ground significantly. (2) Compared with the replacement method, the lime-loess compaction pile method is more effective in the aspect of improving the compression modulus of ground soil. (3) By the field monitoring dada, the accumulative total sedimentation during a whole year is 25.0 mm for the replacement method and 18.2 mm for the lime-loess compaction pile method, and accounts for 79.9% and 78.1% of final settlement respectively. The settlement deformation of both kinds of composite ground presents the trend of the increasing rapid in the early stage and smooth and stable in the late. (4) The cumulative settlement of culverts which were processed by ground treatment keeps in a stable and controllable range, which can effectively improve the security of culvert structure. Lime-loess compaction pile method may perform a more important function in reducing the compression deformation of collapsible loess and improving the bearing capacity of culvert ground than the replacement method. (5) The research results can provide the theoretical guidance and scientific basis for ground design and disease prevention of culvert in collapsible loess areas. © 2017, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Li M.,Xi'an University of Science and Technology | Zheng J.,Northwest Research Institute Co. of China Railway Engineering Corporation
Journal of Railway Engineering Society | Year: 2013

Research purposes: The secondary hazards of the slope happen continuously after the Wenchuan earthquake and they cause big losses. In order to provide theoretical guidance for prevention and reduction of the earthquake disaster, the study was done on the slope disease type, the slope characteristics and the distribution and scale of the slope disease based on the investigation of the slope disease along the Wenchuan-Yingxiu section of the Dujiangyang-Wenchuan Highway, the Chengdu-Guangyuan section of the Baoji-Chengdu Railway and the Chengdu-Kunming Railway. Research conclusions: (1)The 97 slope diseases of six categories were found in the investigated area. Among these diseases, the slide was the serious disease, followed by the landslide and the collapse while there was a little dehris and seldom scattered. The rockfall was common, but its scale was small. (2)The medium loose and broken slope at the higher altitude was generally the potential disease-prone slope. (3)With earthquake effect, the damage degree of slope gradually weakened from the epicenter to the perimeter, it meaned the epicenter was the heavy disaster area, and the slope disease damage gradually decreased with increase of the distance to epicenter. (4)The research results can be used in preventing secondary slope disaster in earthquake disaster areas.


Cheng X.-W.,Northwest Research Institute Co. of China Railway Engineering Corporation | Wang Z.,Northwest Research Institute Co. of China Railway Engineering Corporation | Zhang X.-B.,Northwest Research Institute Co. of China Railway Engineering Corporation
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

Based on the inclination-rectifying and reinforcement of a thirty-storey residential building, the relevant inclination-rectifying measures and control technology are introduced after analyzing the causes of its inclination. In order to ensure the safety, stability and linear structure of inclined building, this project first adopts the combined inclination-rectifying reinforcement means of "major soil-digging and minor anchor-pressuring", and brings forward many control technologies such as stress control, fine-tuning by anchor-pressuring and deformation control and so on, and thus scientific and reasonable construction procedures are prepared so as to guarantee successful implementation of inclination-rectifying and reinforcement of the high-rise building. The inclination rate of the building returns to 0.89‰ from 2.61‰, meeting the national related standards and practical requirements. This project has created a new national record of inclination-rectifying buildings in the building height (97 m) and the number of building floor (30 floors), and fills in the gap for the implementation of inclination-rectifying of high-rise buildings located on the weathered mudstone, complex foundation and deep foundation. It will be useful for rectifying inclined high-rise buildings.


Wu X.-P.,Lanzhou University | Wu X.-P.,Northwest Research Institute Co. of China Railway Engineering Corporation | Xiong Z.-W.,Northwest Research Institute Co. of China Railway Engineering Corporation | Wang X.-J.,Zhejiang University | Qu Y.-H.,Northwest Research Institute Co. of China Railway Engineering Corporation
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

This paper makes a study of the collapsible characteristics under overburden pressure of the Western Henan loess along Zhengzhou-Xi'an high-speed railway by field experiment. The developing process in the depth of loess collapsibility under overburden pressure and the collapsible horizontal distance have also been analyzed. The results show that: the influence of soaking boundary on collapse is very clear; but collapsible rate shows a slow-fast-slow-until-stable tendency, with 60% of the total settlement immersed for 10 days and 90% for 30 days. The β 0 of the site is 1.30, greater than the recommended 0.9 by the code. The results show that the extent of collapsibility of this region is more intense than that of general knowledge. In the site, loess collapse under overburden pressure maximum depth laboratory test value is 19 m; and field test value is 16 m, the former is 1.2 times the latter. The collapsible horizontal distance out of the test pit is 20 m, similar with the diameter of the test pit. Therefore, no water should be kept within 20 m from the embankment toe. The research results have been applied to the Zhengzhou-Xi'an high-speed railway construction, and can be taken as reference for similar projects in this region.


Peng N.,Lanzhou University | Yan Z.,Lanzhou University | Sun B.,Northwest Research Institute Co. of China Railway Engineering Corporation | Gao L.,Lanzhou University
AIP Conference Proceedings | Year: 2013

The Yungang Grottoes are one of most famous ancient Chinese Buddhist temple grottoes in the province of Shanxi. To preserve the grottoes against the earthquake which is one of the most important factors leading to damage of the grottoes, a 3-D finite element dynamic model of the 19th grotto's west ear-grotto is built to explore its dynamic responses under earthquakes. The simulation results show the cliff has a tendency to dump, and the distribution of final state displacement on thin rock mass between grottoes is rhythmical. Larger acceleration plays a decisive role in the displacement responses. The maximal peak ground acceleration (PGA) amplification factor could reach ∼ 130. The rock mass ranging from the roof of ear-grotto to the top rock mass absorbs most of the energy and is the most dangerous region where collapse often happens. © 2013 AIP Publishing LLC.


Song X.-J.,Northwest Research Institute Co. of China Railway Engineering Corporation
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

The distribution of landslide K7-K45 section of Shizhu-Zhongxian Highway is analyzed. The distribution laws of landslide are influenced by topography, character of strata and geologic formation. So the design of highways is to avoid disease. If the highway can't avoid the disease, the designer must give suggestions for proper measures. The main causes for landslide are investigated. To change the inner factor is difficult, so proper measures are necessary. Building highways will cause disease of old landslide and produce disease of new landslide. The treatment of landslide must be considered in the construction of highways. The principle of treating the disease as early as possible and avoiding treating the disease again and again should be aclopted.


Li Y.-Q.,Northwest Research Institute Co. of China Railway Engineering Corporation
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Thermal probes, a device to exchange heat with air and liquor convert, have characteristics of no engine loss and highly decreasing earth temperature around the thermal probes. The thermal probes have obvious effects for decreasing earth temperature under the foundation, increasing cold storage of earth foundation and protecting permafrost. It is a simple and suitable engineering measure for protecting permafrost. Now it has been widely used in Qinghai-Tibet Railway in permafrost area. In view of application of the thermal probes in the civil engineering, many researches in China and foreign countries are carried out. Many key technologies of thermal probes are solved, for example, making crafts, trail of model in low temperature, design and calculation and so on. But there are not any father researches on the relation among diameter of thermal probes, effect of decreasing earth temperature and producing cold quantity. In order to solve this kind of problems, a series of experiments in permafrost region along the Qinghai-Tibet Railway are performed. The test content includes three thermal probes with the same length but different diameters in Anduo experimental section. In given conditions, within certain range of diameter of thermal probes, the results show: (1) its producing cold quantity doesn't increase with the increase of the diameter; (2) there seems to be the same decreasing earth temperature and producing cold quantity with different diameters; (3) after comprehensive consideration, the optimal diameter of thermal probes is 89 mm.


Wang X.-J.,Zhejiang University | Wang X.-J.,Northwest Research Institute Co. of China Railway Engineering Corporation | Mi W.-J.,Northwest Research Institute Co. of China Railway Engineering Corporation | Xiong Z.-W.,Northwest Research Institute Co. of China Railway Engineering Corporation | And 3 more authors.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2012

Eight typical sites for water immersion tests of collapsibility of loess foundation were determined by combination of the distribution characteristics of loess along the Zhengzhou-Xi'an Passenger Dedicated Line. The test results show as follows: The two water immersion test sites in the section between Zhengzhou and Mianchi exhibit the maximum self-weight collapse settlement of 0.47 cm to 2.65 cm, belonging to class II of non self-weight collapsible sites; the six water immersion test sites in the section between Mianchi and Xi'an exhibit the maximum self-weight collapse settlement of 10.4cm to 160.3 cm, belonging to class II to class IV of self-weight collapsible sites; self-weight collapsibility of loess basically obeys law of gradual strengthening from east to west; for the low-limit depth of self-weight collapsible loess, the values measured at sites are generally less than the calculated values of samples; there is a relationship of the former controlling the latter in sequence with regard to the immersion area, scope of self-weight collapse deformation and range of cracks occurrence. The loess collapsibility of the Zhengzhou-Xi'an Passenger Dedicated Line was evaluated by sections and the foundation treatment depth, the design depth of negative friction of pile foundation and the widths of roadbed waterproof and drainage are recommeded.


Liu S.-F.,Northwest Research Institute Co. of China Railway Engineering Corporation
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

With the rapid development of basic communication construction in China, basic road construction is steadily increasing. The miles of roads increase and the grade of roads goes higher. In order to raise transport speed and efficiency, the line selection and road construction gradually extend from plain areas to hilly and mountainous areas, and consequently the problem of slope disasters is increasing. A brief introduction of roadbed diseases in Huangnan district of Qinghai Province is given. In a case study, the distribution of disease area, characteristics of deformation, causes of diseases, scale of diseases, tendency of disease development, degree of dangerousness and hazard extent are analyzed and studied. After a comprehensive analysis of the causes of deformation, the corresponding control measures are presented and are proved to be effective.

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