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对高坝建基面使用弱风化岩体,成为具有重大经济效益及学科意义的问题,它直接关系工程的开挖量、施工工期和工程造价。在二滩拱坝的建设中就遇到了这样的问题,为了确保大坝的稳定性及经济性,要求对建基面附近的弱风化岩体进行加固灌浆处理,并研究其加固后的力学特性。本文叙述了灌浆后岩体力学特性的检测结果,并用断裂—损伤力学方法对岩体力学变化的机制做了理论分析。实测结果及理论分析表明,灌浆后岩体的力学强度有了提高,可以满足大坝设计的要求。
The use of weakly weathered rock masses on the base surface of high dams has become a matter of major economic and disciplinary importance. It directly relates to the amount of excavation, construction period and project cost of the project. This problem was encountered in the construction of the Ertan arch dam. In order to ensure the stability and economy of the dam, it is required to reinforce the grouting treatment of the weakly weathered rock mass near the base surface and study its mechanical properties after reinforcement. . This paper describes the test results of rock mechanical properties after grouting, and uses the fracture-damage mechanics method to make a theoretical analysis of the mechanics of rock mechanical changes. The measured results and theoretical analysis show that the mechanical strength of the rock mass after grouting has been improved and can meet the requirements of the dam design.