Based on the Xiao Beishan No.1 tunnel engineering of Jie Hui highway in Guangdong province,the golden section method and displacement back analysis are conducted to obtain the geotechnical parameter elastic modulus E and cohesion c with the geotechnical engineering analysis software FLAC3D.The measured data of section K14+640 is selected to check the accuracy of numerical results and the error is small.The results show that it is reliable to determine rock mechanics index by displacement back analysis.%本文以广东省揭惠高速公路小北山1号隧道工程为背景,结合岩土工程分析软件FLAC3D,采用黄金分割法,进行位移反分析,得到了围岩参数弹性模量E和粘聚力c,并选用K14+640断面的实测数据加以验证,计算结果误差较小.研究结果表明,采用位移反分析获取岩体力学指标是可靠的.
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