【摘要】 基于广东省3个核电站厂址区的水压致裂地应力测量结果,获得了各核电站厂址区现今地应力场分布特征,结果表明,各核电站厂址区以水平应力为主导;大亚湾、阳江核电站水平应力值随深度增加而呈线性增大,台山核电站水平应力随深度线性增加不明显;大亚湾、阳江核电站厂址区最大水平主应力方向为NW-NWW,台山核电站为NNW。根据地应力测量结果、相关理论及判据分析认为,大亚湾核电站拟建隧洞长轴方向较不利于隧洞围岩的稳定,台山和阳江核电站拟建隧洞长轴方向利于围岩的稳定和维护;各核电站拟建隧洞横截面形状以水平长轴、垂向短轴且长、短轴比近似于各隧洞截面上侧压力系数的椭圆形为宜;各隧洞在埋深范围内开挖时均没有发生岩爆的可能性。最后,依据Byerlee滑动摩擦准则,探讨了核电站外围现今活动断层的稳定性。更多还原

【Abstract】 According to the in-situ stress measurement results with the method of hydraulic fracturing measurement at three nuclear power stations in Guangdong province,the distribution characteristics of current in-situ stress state at each nuclear power station are obtained.The results show that the horizontal stresses are dominant at each nuclear power station;and that horizontal principal stresses increases linearity with the depth at Dayawan and Yangjiang nuclear power station,while the phenomenon is not obvious at Taishan nuclear power station;and that the direction of maximum horizontal principal stress is NW-NWW at Dayawan and Yangjiang;however,is NNW at Taishan.Based on the data of stress and the interrelated theories as well as criterions,it is concluded that major axis orientation of tunnels at Dayawan goes against the stabilities of the tunnels;while these are beneficial to tunnels’ stability at Taishan and Yangjiang;and that the favorite shapes of all tunnels’ cross-section are ellipses with horizontal long axis,vertical short axis and long to short axis ration as lateral pressure coefficient;and that the rock burst is not happened during tunnels excavation at different buried depth.Finally,based on the sliding friction criteria of fault,the stabilities of the active faults are discussed.更多还原