不透水层下水工压力隧洞特性分析

Stresses Analysis of Hydraulic Pressure Tunnels under a Rock Slope with Iimpermeable Surface

根据Harr(1962)提出的镜像理论,引入一组虚汇推导不透水覆盖层下压力隧洞围岩中水压力分布;结合Fernandez(1994)所作的假定推导出山坡不透水覆盖层下水工压力隧洞围岩渗流产生的有效应力场;结合现有的部分成果,详细研究山坡不透水覆盖层下压力隧洞充水运行期围岩应力场特性,并对上覆不透水层的稳定性进行评价。按挪威准则设计压力隧洞并不能保证覆盖层的稳定性。

The pore-water-pressure distribution in the rock mass around the tunnel was implemented using the image well method by Harr（1962）. And the effective stresses distribution induced by seepage from a pressure tunnel into a rock mass under a rock slope with impermeable surface are estimated using the Fernandez＇s assumptions（1994）. The stresses distribution in the rock surrounding a pressure tunnel working state full of water and the stability of the roek slope are studied. When the pressure tunnel is designed under the Norway rule, it must be paid attention to the stability of the rock slope with impermeable surface.