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长期超采地下水是诱发地裂缝的重要因素之一。为了揭示由地下水开采诱发基岩潜山型地裂缝的成因机制,预测地裂缝发育的高风险区,根据无锡某一典型的工程地质剖面,采用FLAC3D接触面单元模拟地裂缝,建立了包含21个接触面单元的数值模型;分析了地下水开采过程中土体的变形特征,依据接触面的开度变化,对地裂缝的高风险区进行了预测。模拟结果表明,对于基岩面起伏、压缩层厚度不均匀的地层,地裂缝的高风险区位于基岩潜山山脊的上方。通过与现场调查结果的对比,验证了本文所提出的采用FLAC3D接触面单元预测地裂缝高风险区的方法是可行的和有效的。
Long-term over-exploitation of groundwater is one of the important factors inducing ground fissures. In order to reveal the genetic mechanism of ground-burial buried hill fissure induced by groundwater exploitation and predict the high risk zone of ground fissure development, based on a typical engineering geological section in Wuxi, FLAC3D contact surface unit was used to simulate ground fissures. The numerical model of the contact surface element was analyzed. The deformation characteristics of the soil during the groundwater exploitation were analyzed. According to the change of the opening of the contact surface, the high risk zone of the ground fissure was predicted. The simulation results show that the high-risk zone of ground fissures is located above the buried hill ridges of the bedrock with uneven bedrock and compressive layer thickness. Through the comparison with the field survey results, it is validated that the proposed method using FLAC3D contact surface unit to predict the high risk zone of ground fissures is feasible and effective.