应用地质力学模型实验方法，详细研究了水布垭水电站地下洞室在地应力场作用下，洞室无处理、软岩置换与锚桩锚杆3种方案的开挖稳定情况，比较了3种方案的应力、变形、超载破坏形式及超载安全系数。成果表明：洞室无处理的稳定性最差，其较大拉应力值为1.44 MPa，较大变形值为29.1 mm，超载安全系数为1.75。软岩处理方案超载安全系数为2.5，软岩处理加喷锚支护情况安全系数大于2.6。水布垭地下厂房洞室开挖，在技术上是可行的，软岩处理和洞底锚桩处理及锚杆支护作用效果明显，可确保洞室的安全可靠。

Stable situations of three kinds of excavated cavities of Shuibuya Hydropower Station under the action of crustal stress were detailedly researched by using geology mechanics model. The study includes three kinds of schemes, i.e., without processing, soft rock replacement and reinforcement with anchor piles and anchor ties, for which the stresses, deformations, overload failure forms and overload safety coefficients were compared. The achievement indicates that: the stability of without processing scheme is worst, the maximum tensile stress 1.44 MPa, deformation 29.1 mm and the overload safety coefficient 1.75; for soft rock replacement scheme, the overload safety coefficient is 2.5; the overload safety coefficients is 2.6 for reinforcement project. From research result, the technology of cavity excavation of the underground plant of Shuibuya Hydropower Station is feasible. The effects of two the soft rock replacement scheme and the reinforcement with anchor piles and anchor ties project are obvious. This two schemes can guarantee the security and reliability of the underground plant.