摘要
从降雨渗透对隧道围岩体的物理力学作用出发,采用多孔介质饱和渗透理论,探讨了降雨渗流对岩体的增荷和抗剪强度减弱效应,得到了隧道结构上荷载的分布特征.通过最小二乘技术得到了均匀各向同性渗透介质的抗剪强度指标粘结力c′和内摩擦角φ′的计算式及参数处理结果.结合算例表明:年降雨量对隧道覆盖层厚度有着重要的影响,呈非线性递增关系的规律.同时该分析模型能完全反映降雨渗流作用下隧道围岩体的稳定过程,且参数少、物理意义明确、计算结果可靠,研究结果可为地下隧道工程的设计和施工提供借鉴.
Starting from the physical and mechanical functions on surrounding rock under rain infiltration,the weakening effect is studied by the seepage from under water,including increasing load and anti-shear strength,The loading character is also given for tunnel constructure.Least square technique is used for the shear strength index on cohesive force and inner friction angle,and the penetration medium is considered as the homogenous-isotropic thing.The results show it is important for overburden thickness to affect surrounding rock of tunnel stability in the condition of annual rainfall and the relation is a nonlinear curve between annual rainfall and overburden thickness.The calculated parameters are few in the model and conclusion is also reliable.It can provide reference for similar projects on design and construction.
作者
王军
杨超
陈长睿
邓志颖
WANG Jun;YANG Chao;CHEN Chang-rui;DENG Zhi-ying(College of Building Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)
出处
《湖南工程学院学报（自然科学版）》
2019年第1期77-80,共4页
Journal of Hunan Institute of Engineering(Natural Science Edition)
关键词
隧道工程
降雨量
剪切破坏
覆盖层厚度
tunnel engineering
rainfall capacity
shear damage
overburden thickness
