为了对卡里巴水电站地下厂房区地应力场特征及其围岩稳定性进行评价,采用基于三维有限元模拟的多元回归分析方法,对地应力实测资料进行了回归拟合,获得了工程区应力场的分布规律。其中,计算值与实测值能较好地拟合,回归效果良好。根据回归分析结果可知:地下厂房区以水平向构造应力场为主,属于低应力区,其应力分布主要受地形地貌、地层岩性和断裂构造的影响;最大水平主应力与拟订地下厂房的长轴线近于平行,有利于厂房围岩的稳定。
In order to evaluate the in-situ stress field and surrounding rock stability of Kariba Hydropower Plant’s underground powerhouse, we employed multi-factor regression analysis method based on three-dimensional finite element simulation in the regression fitting of measured data so as to obtain the distribution of stress field. The calculated values could well fit the measured values, so the regression results were good. According to regression results, the stress field of underground powerhouse was mainly influenced by horizontal structural stress field and in low stress level due to the effect of topography and geomorphology, formation lithology and fault structure. The direction of maximum horizontal principal stress approximately paralleled to the long axis of the powerhouse, beneficial to the stability of surrounding rock.
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