【作者】 尹冬梅；

【导师】 吕晓寅； 朱尔玉； 张沁成；

【作者基本信息】 北京交通大学 ， 结构工程， 2008， 硕士

【摘要】 西龙池抽水蓄能电站地下厂房围岩岩体结构的类型以缓倾角层状为主,对于顶拱的顺利开挖十分不利,为此地下厂房洞室系统设置了完善的监测措施。本论文主要对西龙池电站地下厂房的围岩稳定性进行了研究。在简要介绍了西龙池地下厂房的工程概况和监测设计后,整理和分析了厂房开挖两年多来的多点位移计、声波仪、锚杆测力计和锚索锚固力的监测数据,归纳出地下洞室围岩变形分布规律、变形与开挖掌子面的规律,变形与时间的规律;塑性区范围;锚杆和锚索受力的分布规律。同时从理论上探讨了地下厂房的支护效果和支护时机,利用极限平衡法验算喷锚支护的参数选取合理性,利用BMP2000和FLAC3D软件对地下厂房的开挖和支护进行数值模拟,分析了在原设计支护条件下围岩应力、围岩变形和塑性区分布规律,对比理论计算值和监测值评价了西龙池地下厂房的支护效果。最后将监测结果和各种围岩稳定的判定标准进行比较,判定本工程围岩稳定性满足要求;同时综合国内众多大型高边墙地下厂房的监测资料,提出了围岩稳定的速率比值判定法和绝对变形判定方法。更多还原

【Abstract】 Rock mass structure of underground powerhouse in Xilongchi Pumped Storage Power Station is mostly low-angled layered rock and unfavourable to successful excavation of the arch, thus systematic monitoring measures were installed in the underground powerhouse. This paper mainly about the stability of surrounding rock in Xilongchi underground powerhouse.After brief introduction of the construction situation and monitoring design, this paper sums up the deformation regulatilies of surrounding rock, the changing rules of deformation with time and heading face; the distribution of plastic zone and regularities of supporting force for anchor bolt and anchor cable based on arranging and analyzing the monitoring datum from multi-spots displacement meters, acoustic-waves-monitors and anchor monitors in the recent 2 yearsAt the same time, the supporting effectiveness and supporting opportunity are studied from the viewpoint of theoretical calculation by using limit equilibrium method and software such as BMP2000 and FLAC3D, with which the excavation and supporting process of the underground powerhouse are numerically simulated.Then the thesis analyzed the characteristics of the stress, deformation and plastic zone of surrounding rock and evaluated the supporting effectiveness by comparing the theoretical calculation results and monitoring datumAt last, the stability of surrounding rock of this project is demonstrated to be reasonable by comparing the monitoring deformation of surrounding rock with several relevant stability criterions used in common at present. Futhermore the paper proposes two methods, namely the speed-ratio method based on deformation speed of rock and absolute-deformation method by synthesizing monitoring datum of several large powerhouse with high sidewalls.更多还原