中文摘要：

针对围岩抗力系数在隧道开挖引起围岩变形应用中的不足,借鉴抗力系数的概念提出了评价围岩承载能力的自承载系数,给出了其物理意义,并以等值地应力作用下深埋圆形隧道为例进行了围岩自承载系数计算式推导与参数影响特性分析。研究结果表明：围岩自承载系数是多种因素共同作用下的综合评价指标,支护力、材料模型、中间主应力、围岩峰后粘聚力、剪胀特性和塑性区弹性模量均对其有显著影响;自承载系数曲线被临界支护力分成弹性和塑性两段,采用理想弹-塑性模型或不考虑剪胀特性均会高估围岩的自承载能力,应充分考虑中间主应力效应并设法提高围岩峰后粘聚力和塑性区弹性模量。

英文摘要：

Aimed at the deficiency in application of rock resistant coefficient to the surrounding rock deformation caused by tunnel excavation, according to the concept of resistance coefficient, a self-carrying capacity coefficient of surrounding rock was proposed in this study to evaluate the carrying capacity of surrounding rock, and its physical meaning was also given. A deep circular tunnel under initial hydrostatic in-suit stress was used as an example to derive the self-carrying capacity coefficient of surrounding rock, and effects of parameters were discussed. The results show that the self-carrying capacity coefficient of surrounding rock is a comprehensive evaluation index by multiple factors; the influences of support pressure, material model, intermediate principal stress, post-peak cohesion, dilatancy and elastic modulus in the plastic zone on the self- carrying capacity coefficient are significant~ the self-carrying capacity curve is divided by the critical support pressure into two parts, elastic part and plastic part~ the self-carrying capacity of surrounding rock will be overestimated for the perfect plastic model or with dilatancy not considered~ the intermediate principal stress effect for rock should be fully considered~ some efforts should be made for improving the post-peak cohesion and elastic modulus in the plastic zone.