Abstract：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.
Research conclusions：The rock soil parameters influencing the convergence of the verticalm easuring line in order from big to small are deformation modulus, the poisson's ratio, the internal friction and the cohesive strength, but for the horizontal measuring lines are the poissons' ratio, the modulus, the internal friction and the cohesive strength.
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2010, Vol. 27 
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