基于与围岩相互作用的冻结壁塑性设计理论  

Plastic design theory of frozen soil wall based on interaction between frozen soil wall and surrounding rock

作　　者：杨维好[1,2] 杜子博[2] 杨志江[1,2] 柏东良[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《岩土工程学报》2013年第10期1857-1862,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家高科技研究发展计划(863计划)课题(2012AA06A401);中央高校基本科研业务费专项资金项目

摘　　要：冻结壁设计理论是冻结法凿井技术的核心之一。传统的冻结壁厚度塑性设计公式是在加载条件下导出的,未考虑冻结壁与围岩的相互作用和内摩擦角的影响,与实际相差较大。为了更合理地设计冻结壁,建立了考虑开挖卸载作用的冻结壁与井壁相互作用塑性力学模型,推导了应力与位移解析解,分析了各因素对冻结壁厚度的影响规律,建立了新的塑性冻结壁厚度计算公式。分析表明,新公式较传统的公式更合理,并建议选用Coulomb-Mohr屈服准则进行冻结壁厚度计算。The design theory of frozen soil wall （FSW） is one of the core technologies for mine shaft freezing sinking. The conventional plastic design formula for the thickness of FSW is deduced under loading conditions. It does not take into account the interaction between FSW and surrounding rock and the effect of angle of internal friction, and it has a greater error compared with the actual situation. For a more rational design of FSW, considering the excavation unloading effect and the interaction between FSW and its surrounding rock, an elastic-plastic mechanical model is established, and analytical solutions for stress and displacement are derived. The influences of various factors on the thickness of FSW are discussed. A new formula for the thickness of plastic FSW is developed on the basis of the solutions. The analyses show that the new formula is more reasonable than the traditional one, and the use of the Coulomb-Mohr yielding criterion for calculating the thickness of FSW is suggested.

关 键 词：冻结壁 围岩 相互作用 弹塑性分析 设计理论 

分 类 号：TD265.3[矿业工程—矿井建设] TD262.1