线性与非线性破坏准则下浅埋隧道围岩压力计算  

Calculations of Surrounding Rock Pressures of Shallow Buried Tunnels under Linear and Nonlinear Failure Criteria

作　　者：李玉峰[1,2] 彭立敏[1] 张永红 黄国富 雷明锋[1] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中国建筑第五工程局有限公司,长沙410004

出　　处：《现代隧道技术》2013年第5期68-74,共7页Modern Tunnelling Technology

基　　金：国家重点基础研究发展计划资助项目(973:2011CB013802);国家自然科学基金高铁联合基金重点项目(U1134208);国家自然科学基金资助项目(50808176);中国建筑第五工程局有限公司项目(2011)

摘　　要：文章基于泰沙基破坏模式,构建了线性与非线性破坏准则下浅埋隧道围岩压力计算方法,并将泰沙基理论扩展到复合地层,推导得到了复合地层条件下隧道竖向围岩压力的递推公式;将隧道边墙破裂区围岩作为隔离体进行静力极限平衡分析,获取了浅埋隧道水平围岩压力的显式表达式,并进行了实例验证;进一步探讨了线性与非线性破坏准则下,上覆地层侧压力系数及非线性系数对围岩压力值的影响。研究结果表明:围岩压力随侧压力系数和非线性系数的增大而分别呈显著减小和缓慢减小的变化趋势;非线性系数对水平围岩压力影响略大。In this paper, the calculation method of surrounding rock pressure of shallow buried tunnels under linear and nonlinear failure criteria is established on the basis of the Terzaghi failure mode. The modified Terza- ghi theoU is applied to compound stratum, and the recursive formula is derived for calculating the vertical sur- rounding rock pressure under the compound stratum. The surrounding rock at the fractured zone of the tunnel side wall is analyzed as an isolated body by the limit equilibrium method, and the explicit calculation expression of the horizontal rock pressure of shallow buried tunnels is obtained. A case analysis indicates that this method is feasible. Further the influence of the lateral pressure coefficient of overlying strata and the nonlinear coefficient on the surrounding rock pressure is studied with linear and nonlinear failure criteria. The results prove that for in- creasing lateral pressure coefficients and nonlinear coefficients, the surrounding rock pressure decreases dramati- cally and gradually respectively, and the influence of the nonlinear coefficient is slightly higher regarding horizon- tal surrounding rock pressure.

关 键 词：浅埋隧道 围岩压力 泰沙基理论 复合地层 极限平衡法 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]