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野外调查与室内分析表明,影响大坝基础稳定性的北西向断裂属不活动断层;压碎岩占80％以上,强度较高,有利于坝基工程基础处理;引水隧道及峒室工程必需考虑现今构造应力场主压应力近南北向来布置,以减少构造应力对围岩稳定性带来的不利影响。
Field investigation and laboratory analysis show that the NW strike affecting the dam foundation stability is an inactive fault; the crushed rock accounts for more than 80% and has high strength, which is beneficial to the foundation treatment of dam foundation. The diversion tunnel and pylon project must consider the present The main stress of tectonic stress field is arranged near north and south direction to reduce the unfavorable influence of tectonic stress on the stability of surrounding rock.