基于破坏接近度的围岩稳定性研究.pdf

中国农村水利水电 2009 年第4 期 87 :2009 基于破坏接近度的围岩稳定性研究 汤福平,肖 明,张雨霆 ( , 430072) :结合屈服接近度(YAI) 和塑性荷载指数(PLI)的概念, 提出了破坏接近度(FAI)的新 义将该指标引入到 三维非线性有限元中,通过对某水电站大型地下洞室群进行计算分析,表明该概念可以正确 量地评价围岩的稳 性程 度,描述非塑性区塑性区的位置和范围,并能描述围岩稳 性状态随开挖过程的演化规律,以预估未来开挖扰动对岩体 稳 性的影响可见破坏接近度对工程稳 性评价施工中开挖方式开挖进尺的设计以及支护时机的控制等具有重要 的意义 :地下洞室群;稳 性评价;破坏接近度; 屈服接近度;塑性荷载指数 :TU 457 :A Research on Rockmass Stability Based on Failure Approach Index TANGFuping, XIA Ming, ZHANGYuting (Key Laboratory of ater Resources and Hydropower Engineering Science, uhan University, uhan 430072, China) Abstract:Onthe basisof the YAI(yield approach index) and PLI( plastic load index) ,the new concept, FAI ,is introduced. It is the sum of danger coefficient CRI (thephasecomplementary parameter of YAI ) which describes the damagedegreeof rockmassinthee lastic zone and PLI which describes the damage degree of rock mass inthe plastic zone. This concept is introduced in the three di mensional nonlinear finite element method and it is used to analyze the stability of largescaleunderground caverns of a hydropower station. The results show that this concept can describe the criticality of rockmass. So this concept is very important in the assess ment of stability, the election of excavating and supporting schemes. Key words:underground cavern group; stability evaluation; failure approach index; yield approach index; plasticload index , 0 , , , , , , ,, , , , , , ,