基于破坏接近度的岩土工程稳定性评价

基于屈服接近度概念，将塑性区内塑性应变损伤评价与其结合，提出了破坏接近度(FAI)的新定义。有关地下工程围岩和边坡稳定性的工程实例应用评价表明，该概念可以正确定量地评价围岩内各区域岩体的稳定性程度，表达破坏区、损伤区和扰动区的位置和范围，并能描述各分区岩体稳定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定性的影响；可以正确的评价边坡滑动面的剪切破坏程度，给出滑动面的位置。可见破坏接近度对工程稳定性评价，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。

Stability assessment of rockmass engineering based on failure approach index

On the basis of the YAI(yield approach index) concept and its phase complementary parameter ω called danger coefficient, which were proposed in the previous paper by the authors, the new concept, FAI, is introduced. It is the sum of danger coefficient ω and FD(failure degree) which describes the damage degree of rockmass in the plastic zone. Two cases are presented to analyze the validity and utility of FAI. The results proved that this parameter can line out the position and extent of failure zones, damage zones and disturbed zones, and characterize the stability rules of rockmass. In the stability assessment of slope engineering, the sliding surface denoted by this parameter perfectly agrees with that measured in situ. So, FAI is of very importance in the stability assessment, the election of excavating and supporting schemes.