基于双剪强度理论下土质隧道自然成拱的最小埋深研究  

The Minimum Buried Depth of Soil Tunnel Natural Form Arch Based on Twin Shear Strength Theory

作　　者：李腾飞[1] 陈秋南[1] 马晓朋[1] 赵柳[1] 

机构地区：[1]湖南科技大学土木工程学院,湘潭411201

出　　处：《湖南工程学院学报（自然科学版）》2013年第3期78-80,共3页Journal of Hunan Institute of Engineering(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41172275)

摘　　要：对于计算土质隧道的成拱埋深问题,普遍都是基于Mohr-Coulomb强度理论下的求解,但是,由于其理论仅仅只考虑了大小主应力的影响,而忽略了中间应力,因此,计算结果与实际情况偏差较大;而双剪强度理论则弥补了Mohr-Coulomb强度理论的缺陷,考虑了中间应力的影响,使其更加符合实际.并将两者用于实际工程计算,结果表明采用双剪强度理论计算的成拱埋深临界值小于MohrConlmb强度理论计算的成拱埋深临界,计算结果更为精确,用于设计更加安全.To calculate buried depth of the soil tunnel natural form arch based on Mohr-Coulomb strength theory, the intermediate principal stress is not considered. The result is compared with actual situation that there are quite different. Twin shear strength theory is mean to remedy the defect of Mohr-Coulomb strength theory and the intermediate principal stress is considered, which is more realistic. The two theories are used to calculate the actual project. The resuct shows that the calculation based on twin shear strength theory is less than the one based on Mohr-Coulomb strength theory. The result of calculation based on twin shear strength theory is more accurate and the design is safer.

关 键 词：土质隧道 双减强度理论 隧道埋深 卸荷拱 

分 类 号：TU93[建筑科学—结构工程]