研究目的：地下工程的施工过程是其结构安全度最差的阶段，为了确保施工过程中的结构安全，选择加固围岩的方法是工程技术人员最关心的问题之一，因此围岩参数对结构安全的敏感性就成了关键因素。针对海南工程，运用大型通用有限元数值分析软件(ANSYS)，采用Monte-Carlo随机有限元理论模拟，计算大断面地下洞室多层耦合应力超前解除及分层逆作2种方法的开挖过程，在开挖过程中对每一步布置测线，对测线的收敛进行统计分析，比较围岩参数对各条测线收敛的影响程度，针对各条测线对围岩参数的敏感性进行分析，比较总结出影响地下洞室收敛的关键因素。

Research purposes：The construction period of underground engineering is the worst time in safety . In order to ensure the structure safety, choosing the appropriate reinforcement method for the surrounding rock is one of issues paid attention by the engineers. So the sensitivity of the surrounding rock parameters is the key point to the structure safety. With the ANSYS program and theoretical simulation of Monte-carlo random finite element, the excavation processes with advanced releasing multi-layer coupling stress method and layer reversed excavation method are calculated to the large sectional underground cavity of Hainan Project. During the excavation, the statistic analyses are made to every arrangement of the measuring lines and the convergence of the measuring line, the comparisons are made to the influence of surrounding rock parameters on the convergence of every measuring line, and through comparison of the sensitivity of very measuring line to the surrounding rock parameters, the key factors in fluencing the convergence of the underg round cavity are summarized.