锦屏一级水电站地下厂房洞室群地质力学模型试验分析

Geo-mechanics Model Experiment on Underground Cavities of Jingping Hydro-power Station Class-Ⅰ

采用地质力学模型试验,通过模拟洞室岩体的地质构造、岩石物理力学性能指标、地应力场、洞室开挖过程及洞室喷锚支护,研究锦屏一级水电站地下洞室群开挖施工过程中的应力及稳定情况。比较了3种不同的开挖顺序及有无支护方案的作用效果。结果表明锦屏一级水电站地下洞群不论采用哪个开挖方案,在技术上都是可行的。相比较而言,第二方案优于第一、第三方案。支护措施的效果较明显,可确保洞室的稳定安全。

Using geo-mechanical model test the stresses and stability during excavation and construction of the underground cavities of Jingping Hydro-power Station Class-Ⅰ were studied by simulating geo-structure, physical and mechanical features of rock, earth stress, process of excavating cavities and bolt-jetting support. The effects among three different kind of excavating orders and with and without support schemes are compared. It can be assured that all schemes are technically feasible for adopting whichever excavating schemes. Comparatively, second scheme is better than first or third one. The effect of support measures is obvious and they can assure cavities stability and safety.