摘要
考虑土体的非饱和性质,采用极限分析上限法研究非饱和浅埋隧道环形开挖面的稳定性。基于已有的研究成果,构建非饱和浅埋隧道环形开挖面的破坏模式及相容速度场。根据外力功率等于内能耗散率建立功率方程,推导拱顶和边墙围岩压力的解析解,并通过序列二次规划算法得到围岩压力的最优上限解。将饱和与非饱和2种情况下浅埋隧道的围岩压力进行对比,相对差值非常显著,体现了在工程中考虑土体非饱和特性的必要性。此外,分析了非饱和土体参数对浅埋隧道围岩压力和破裂面的影响。
In view of the insaturation of soil mass, the upper bound theorem of limit analysis has been adopted to study the stability of annular excavation face of unsaturated shallow tunnels. Based on the existing research results, the failure mode and compatible velocity field of the annular excavation face for unsaturated shallow tunnels were constructed. The power equation was established based on the external force power equaling the internal energy dissipation rate. The analytical solutions of the surrounding rock pressure of the vault and the side wall were derived. The optimal upper bound solution of surrounding rock pressure was obtained through sequential quadratic programming algorithm. The comparison between surrounding rock pressure of shallow tunnels under saturated and unsaturated conditions has shown significant differences, which reflects the necessity of considering the unsaturated characteristics of soil in engineering. In addition, the influence of unsaturated soil parameters on surrounding rock pressure and fracture surface of shallow tunnels was analyzed and presented.
作者
王成洋
傅鹤林
张佳华
WANG Chengyang;FU Helin;ZHANG Jiahua(School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1161-1167,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51978668,51804113)
关键词
浅埋隧道
非饱和土
基质吸力
极限分析
围岩压力
shallow tunnel
unsaturated soil
matric suction
limit analysis
surrounding rock pressure
