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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。
Based on the results of hydraulic fracturing stress measurement of three nuclear power plant sites in Guangdong Province, the present geostress field distributions are obtained. The results show that the horizontal stress dominated the site of each nuclear power plant and that of Daya Bay and Yangjiang Nuclear Power Station As the depth increases linearly, the horizontal stress of Taishan NPP increases linearly with depth; NW-NWW is the maximum horizontal stress in the site area of Daya Bay and Yangjiang Nuclear Power Station, and NNW is Taishan NPP. Based on the results of field stress measurement, relevant theory and criteria analysis, it is concluded that the long axis direction of Dayawan NPP is not conducive to the stability of tunnel surrounding rock. The long axis direction of Taishan and Yangjiang NPP is conducive to the stability and maintenance of surrounding rock; The cross section shape of the proposed tunnel is horizontal long axis and vertical short axis, and the long and short axis ratios are more suitable than the oval shape approximating the pressure coefficient on the upper side of each tunnel section. No excavation occurred in the tunnel Explosion possibilities. Finally, according to the Byerlee sliding friction criterion, the stability of today’s active faults outside the nuclear power station is discussed.