浅埋盾构不同掘进角度端头土压力的统一解  

Unified solution of end earth pressure of shallow buried shield at different driving angles

作　　者：肖尊群[1] 邓名慧 郑俊杰[2] 林健 XIAO Zunqun;DENG Minghui;ZHENG Junjie;LIN Jian(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430074,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430074 [2]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《华中科技大学学报(自然科学版)》2024年第12期168-177,共10页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51678267);武汉工程大学第十五届研究生教育创新基金资助项目(CX2023193)。

摘　　要：基于极限平衡理论,建立不同掘进方向的端头平均土压力三维楔形体滑块分析模型,将延伸至地表的滑裂面起始位置设置在隧道两腰所在水平面,隧道两腰以下滑块的几何尺寸与盾构掘进方向β建立关系.对盾构拱顶上、下土体分别进行受力分析,建立平衡方程,得到考虑掘进方向β的端头平均土压力的统一解.通过与既有水平盾构端头土压力的研究成果对比,验证了研究思路及所建模型的合理性.结果表明:盾构端头土压力与掘进角度、直径、埋深及土体抗剪强度指标密切相关;一定埋深条件下,当盾构的半径减小到一定程度或者向下掘进(β<0°),并满足一定掘进角度和抗剪强度指标时,端头土压力都会消失,此时盾构端头土体自然稳定.Based on the limit equilibrium theory,a 3D wedge-shaped sliding block analysis model was established for the average earth pressure at the end of different tunneling directions.The initial position of the sliding surface extending to the surface was set at the horizontal plane where the two sides of the tunnel were located.The relationship between the two sides of the tunnel was established between the geometric size of the sliding block and the tunneling directionβ.Based on the stress analysis of the soil above and below the shield vault,the equilibrium equation was established,and the uniform solution of the average earth pressure at the end considering the heading directionβwas obtained.By comparing with the existing research results of earth pressure at the end of horizontal shield,the rationality of the research idea and the established model was verified.Results show that the soil pressure at the end of shield is closely related to tunneling angle,diameter,buried depth and shear strength.Under a certain depth condition,when the radius of the shield decreases to a certain degree,or when the tunnel is driven downward(β<0°),when the tunneling angle and shear strength indexes are met,the earth pressure at the end of the shield will disappear,and the soil at the end of the shield is naturally stable.

关 键 词：浅埋盾构 楔形体 极限平衡 端头土压力 掘进角度 

分 类 号：TU311[建筑科学—结构工程]