利用ANSYS-FLAC3D三维仿真建模方法研究金灯寺石窟防渗技术

为解决石窟窟顶渗水、地基稳定性差等一系列地质病害，提出并分析了截水廊道和导流孔的综合防渗治理技术，对石窟群进行防渗治理。采用有限元软件ANSYS与有限差分软件Flac^3D组合建立高仿真三维地质模型，利用FLAC^3D软件的interface和fill命令实现层状仿真边坡钻孔模型。在原岩应力条件下分析不同方案应力、位移、塑形区效果，基于理论分析和数值模拟优选出最佳防渗方案。结果表明，增加导流孔的方式对岩体边坡损伤最小，且满足对大气降水导流和地下水截流的要求，岩体边坡稳定性主要受近山体外侧导流孔影响，岩体内部钻孔数目或深度的增加对岩体稳定性影响不明显，路基下方山体喷锚网支护和低压注浆结合的综合岩体加固治理技术可以提高山体边坡稳定性。研究结果为同类岩质边坡及内部结构的排水、地下水截流导流和岩质边坡加固问题提供了一种有效和经济的方法。

STUDY ON ANTI-SEEPAGE TECHNOLOGY OF JINDENGSI GROTTOES USING 3D SIMULATION MODELING OF ANSYS-FLAC3D

The drainage channel and water-conductivity drillholes are proposed to carry out the seepage prevention for the grottoes to solve a series of geological hazards, such as water seepage at the top grottoes and bad stability of foundation. The 3D high simulation geological model is established by ANSYS-FLAC3D software, and the drilling on bedding rock slope simulation model is simulated by interface and fill command of FLAC3D software, respectively. The effects of different schemes on rock stress, displacement and plastic zone are analyzed to select the best anti-seepage scheme based on theoretical analysis and numerical simulation on the condition of original rock stress. The results show that the adding water-drilling has the least damage to the rock slope and meets the requirements for drainage of precipitate water and groundwater. The stability of rock slope is mainly affected by the diversion hole near the outside of the mountain, the depth of borehole is no obvious effect on the deformation. The comprehensive rock mass reinforcement and treatment technology combined with mountain spray anchor net support and low-pressure grouting can improve the stability of mountain slope. This paper provides an effective and economic method for the similar drainage and interception diversion of rock slopes, internal structures and rock slope reinforcement.