深埋隧道三心拱洞室平面应变模型试验研究  

A plane strain modeling study of a three-center arch for deep tunnels

作　　者：赵瑜[1,2] 卢义玉[2] 陈浩[3] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044 [3]中国科学院武汉岩土力学所,武汉43007

出　　处：《土木工程学报》2010年第3期68-74,共7页China Civil Engineering Journal

基　　金：国家自然科学基金创新研究群体科学基金(40621463);国家自然科学基金(50804060)

摘　　要：随着隧道的埋深增加、地应力将进一步增加、岩体变形的非线性效应进一步显现,为研究深埋隧道围岩的受力变形特点,以重庆市共和隧道为工程背景,进行深埋隧道平面应变模型试验研究。自行研制了满足工程围岩抗压强度、弹性模量、抗拉强度、泊松比、内摩擦角等指标要求的相似材料,应用内窥摄影技术,全程跟踪了模型试验破坏的全过程,采用"过程分析"的方法,研究高应力条件下隧道关键部位的变形特征、裂纹演化特征。试验结果表明,高应力条件下,洞室围岩变形局部化现象严重,变形发展呈现阶段性、延发性和不对称性;初始围岩损伤是后期急剧破坏的诱因,整个破坏过程可以分为:裂纹局部扩展、裂纹急剧贯通、残余强度三个阶段;已破坏岩体仍然具有承载能力,其残余强度对围岩稳定性具有重要意义。In order to study the geostress state and deformation characteristics of the surrounding rock of deep tunnels, a plane strain model test, with the Gonghe tunnel project in Chongqing as the background, was conducted. Physical model materials were produced to meet the requirements of model test in terms of uniaxial compressive strength, elasticity modulus, tensile strength, Poisson＇ s ratio and internal friction angle. Observation of the deformation and crack development of key components was carried out by using the full inner-spy photograph technology. The test results indicate that under high geostress, obvious deformation localization developed and the deformation evolution was in stages, time delay and asymmetrical. The initial damage was due to rapid lateral failure, and the failure processes could be divided into three stages： crack local extension, crack fast coalescence, and residual strength. The fractured rock mass still provided bearing capacity, which was important to the stability of the surrounding rock.

关 键 词：深埋隧道 模型试验 平面应变 三心拱 

分 类 号：TU45[建筑科学—岩土工程]