【作者】 李文慧；

【导师】 张建海； 邵乃辰；

【作者基本信息】 四川大学 ， 水利工程， 2005， 硕士

【摘要】 设计中如何恰当地发挥围岩自身的承载力,是地下工程支护设计中的第一难题。围岩自支撑能力的消失和破坏是围岩变形发展到一定程度后产生的,而这种变形的产生和发展有一个特定的过程。如果能够把这种变形过程量测记录下来,分析研究变形的发展变化趋势,评判和限制有害变形的发生、发展,无疑对地下工程、尤其是洞室围岩支护设计和施工都有重要意义。本文基于新奥法的原理与技术,以官地水电站地下厂房洞室群为例,开展大型地下厂房洞室群施工期监测与动态支护设计应用技术研究,探索地下工程安全经济建设的实用技术与方法。本文结合官地水电站右岸地下厂房原位模拟洞试验研究成果和官地水电站地下厂房布置、开挖、支护有限元二维或FLAC3D三维数值模拟优化分析及整体稳定性研究成果,对洞室围岩稳定性、成洞条件进行了分析判断。通过对有无支护情况下,洞室围岩变形,最大集中应力、松动区岩体总量等参数的分析比较,对目前支护方案的作用与预期效果进行了评判,进而对地下厂房洞室群监测设计方案和支护设计方案提出了优化调整建议。提出地下厂房洞室群施工期监测与动态支护设计理念,并对其实施条件进行了阐述。主要研究成果及其更多还原

【Abstract】 It is the most difficult problem of underground project reinforcement design to rightly bring wall rock’s carrying capacity to play.The dying away of self-supporting capacity and failure of wallrock is developed with the growth of displacement, and such kind of distortion has a given process. If the deformation process can be measured and recorded, then the trend of deformation can be analyzed, the harmful deformation can then be judged and hanested.Based on New-Austeria principle and technique, take the Guandi underground power station for an example, this paper studies monitoring and dynamic reinforcement technique of large underground power-house in construction period, probed for the practical useful technique and method for under-ground engineering.After analysis of in-situ module cave test of right bank underground power house and 2D finite element method and 3D FLAC3D analysis of deployment, excavation, reinforcement, and stability analysis, the cave wall stability and cave forming condition are proposed. For caves with and without reinforcement, the maximum deformation, maximum stress and volume of loosening region are compared. The function and possible effect of the design reinforcement scheme is anticipated. The optimizing and adjustment suggestions are put forward. The idea of dynamic reinforcement design at construction period accompanying monitoring and its appilication condition are discussed.The main results and and advices are as follows:(1) The jet concrete of present anchoring scheme is divided into three stages:1/3 thickness for each time. The first jeting is applied adjacent to the excavation face. The second jeting time is determined based on the convergence condition and wall diaplacement. If or not the third jeting is needed,and the moment of jeting is based on the convergence condition of monitoring results.(2) The anchoring reinforcement is divided into two steps. The first anchoring is adjacent to the excavation face but in a double distance than the design scheme. If the cave needs further更多还原