Effect of Intersection Angle on the Critical Depth of High-speed Railway Embankment Obliquely Crossing Qanat Culvert
LIU Xianfeng1, ZHANG Yanfei1, YUAN Shengyang1, CHEN Zhiming1, CHEN Weizhi2
1. Key Laboratory of High Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China
Abstract：Research purposes: During the construction of the subgrade engineering, the disturbance of the underground qanat culvert by the inclined crossing can cause different damage patterns in the culvert. Therefore, it is necessary to clarify the response of existing qanat culverts under the new high-speed subgrade engineering, to carry out the study of the subgrade engineering load-foundation soil-qanat culvert interaction through three-dimensional numerical simulation, and to determine the stability critical depth corresponding to different intersection angles. Research conclusions: (1) Due to the oblique intersection between the railway and the existing qanat culvert, when the existing qanat culvert crosses over the overlying subgrade, the subgrade surface will experience uneven settlement. (2) The larger the intersection angle between the culvert and the railway, the smaller the range of plastic zone, the smaller the shear strain around the culvert. The criteria for evaluating the critical depth of the qanat culvert can be better used to evaluate the intersection angle to the stability of the high-speed railway embankment oblique crossing qanat. (3) Combining the critical depth evaluation criteria, the stable critical depth change rule of the qanat culvert without support is obtained, that is, when the intersection angle is 0°, 30°, 60° and 90°, the critical depth of the qanat culvert is 14 m, 13 m, 8 m and 7 m. (4) The research results can provide a technical reference for the design of high-speed railways in the qanat region.
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2022, Vol. 39 
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