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Sun S.-W.,Tsinghua University | Sun S.-W.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Zhu B.-Z.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Ma H.-M.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation
Tiedao Xuebao/Journal of the China Railway Society | Year: 2010

The method for evaluation of stability of regional high slopes is provided. Taking the high slopes along the Wan-Liang Expressway in Chongqing as an example, through analyzing existing geological materials and field investigation data, the index system for evaluating high slopes stability under the actual geological conditions in mountainous areas is built. The weight of the indices is determined by the Analytic Hierarchy Process. The comprehensive fuzzy evaluation model for judging regional high slopes stability is built on the basis of the two-stage comprehensive fuzzy evaluation method and the maximum membership degree principle. Case study shows that, as a high slope stability evaluation method of general significance, the comprehensive evaluation method based on the fuzzy theory is reliable and effective for regional high slopes along railways and expressways in mountainous areas in respect of route selection and optimized design.


Xiong Z.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Jin L.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Cheng J.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Niu D.,Northwest Research Institute Company Ltd of China Railway Engineering Corporation | Shi X.,Lanzhou Jiaotong University
Zhongguo Tiedao Kexue/China Railway Science | Year: 2015

Based on the problem of the frost heaving of high speed railway subgrade in cold regions, for improving the characteristics of permeability and frost heaving, the inorganic materials were added in the coarse grain filling through experimental study. The technical parameters for the improved material type and the optimum ratio were concluded with the standard of the frost heaving ratio below 0.1%. The results show that, the mixed cement can greatly reduce the permeability coefficient and the frost heaving ratio of graded gravel compared with the lime and fly ash. Accordingly, the cement can reduce the moisture permeability to the internal filling and control the frost heaving of filling material. Under the frost heaving test condition of open replenishment, the graded gravel respectively with 15%, 20% and 25% of silt was correspondingly mixed with 3%, 5% and 5% of cement, thus the frost heaving ratio can be controlled within 0.1%. It indicates that, with the cement adding in the coarse grain filling and the appropriate increasing of silt content, the excessive deformation of filling will not occur. Consequently, the problem of frost heaving can be solved for the high speed railway subgrade in cold regions. © 2015, Chinese Academy of Railway Sciences. All right reserved.

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