横观各向同性岩体中位移反分析的测点优化布置

摘要

In underground works ,displacement monitoring has become a key means to grasp rock dynamic chan-ges.Simultaneously ,the arrangement of the measurement points has a significant impact on accuracy and uniqueness of the displacement back analysis .Based on the principle of maximum displacement ,the problem of optimization arrange-ment for measurement points of back analysis in transversely isotropic rock mass is studied .The circular roadway dis-placement variation with angle and radius has been analyzed .Therefore,further analysis of the impact of lateral pres-sure coefficient 'svariation with the displacement has been studied ,and then the rule of optimization arrangement for measurement points has been obtained .The results show that a lager area near the wall in the direction of principal stress is the most suitablearea to arrange measuring points in .%在地下工程中，位移监测已经成为掌握围岩动态变化的关键手段。而测量点的布置对位移反分析的唯一性和反分析精度都有很大的影响。基于最大位移原则，对横观各向同性岩体位移反分析中的测点优化布置问题进行了研究。研究了圆形巷道中位移随角度和半径的变化规律；分析了侧压力系数λ对位移变化规律的影响；获得了测点优化布置准则。研究结果表明，在较大主应力方向靠近硐壁的区域是最优的测点布置区域。