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本文根据近年来国内外工程实践经验,就混凝土坝坝基岩体利用标准和开挖深度的问题,提出一些带趋向性的意见:尽量利用风化裂隙岩石,减少坝基开挖;优先考虑以处理措施代替坝基深挖;对坝基变形的要求有所放宽;裂隙岩体的抗压、抗剪能力及混凝土与岩基接触面的抗剪能力都有较大的潜力;要特别重视坝基排水的作用;在选择坝型时要考虑开挖条件;要讲究开挖工艺,及时覆盖或保护开挖表面;坝基过量深挖并不有利,往往引起不良的后果;设计坝基开挖轮廓时要兼顾安全和经济两个方面。
Based on the practical engineering experience at home and abroad in recent years, this paper puts forward some tendencies with respect to the standards of rock mass utilization and excavation depth of concrete dam. It is suggested to make use of weathered fractured rock as much as possible to reduce the excavation of dam foundation, Dam foundation deep excavation; dam foundation deformation requirements have been relaxed; fractured rock mass compressive strength, shear capacity and concrete and rock-matrix contact surface shear capacity have greater potential; to pay special attention to dam foundation drainage; in Choose dam type to consider when excavation conditions; to pay attention to the excavation process, covering or protecting the excavation surface in time; Excessive deep excavation of the foundation is not beneficial, often leading to adverse consequences; design of excavation profile should take into account both safety and economic Aspects.