二滩电站碎裂结构岩体灌浆处理对岩体力学性态的影响

The Effect of Grouting Treatment of the Fragmental Rock Mass in Er-tan Power Station on the Mechanical Properties of Rock Masses

本文在坝址工程地质条件评价的基础上,分析了碎裂结构纤闪石化玄武岩及微弱风化正长岩的力学特性及可能对坝肩和大坝稳定性的影响;简述了坝址碎裂结构岩体的灌浆试验,对灌浆前后碎裂结构岩体的力学性态进行了系统的检测;研究了灌浆处理对岩体力学性态的影响。试验研究结果表明,坝址碎裂结构岩体经过灌浆处理,其力学性能得到明显的提高,可以满足大坝设计及稳定的要求。

Er-tan Power Station is one of the largest hydroelectric power stations in China.The rock masses of the dam site consist of different kinds of basalt and sienite.The existing problems of the dam site are that the uralic basalt with fracturestructure exists partly in the right abutment and that the deeper weathering-unload belt exists on the left and right bank slopes of the river near the dam site.It is an unfavourable effect on the stability of the right abutment and the founda-tion excavation. Therefore, some chemical and cement grouting tests for thetreatment of the dam foundation were adopted. The test results show that themechanical properties of the uralic basalt with the fracture structure in the rightabutment and the weak weathering sienite with some feeble weathering character-istics(such as its acoustic wave velocity, shearing strength of structure surface,triaxial test strength, deformation modulus and so on) are improved obviously.It is helpful for the stability of the dam foundation and the engineering constru-ction of the hydroelectric power.station.