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针对在城市修建地铁时可能遇到的一种严重危害工程安全的地质灾害体——溶洞,建立了4种典型溶洞模型,使用有限元法和迭代法进行正反演数值模拟,得到井间电阻率成像方法对典型溶洞的探测响应特征,分析总结不同模型响应特点,辅以大连地铁工程实例验证实际探测中的良好应用效果。研究结果表明,井间电阻率成像方法是城市地铁溶洞探测的一种有效的方法,可为城市地铁施工提供相应的安全保证,基于数值模拟和工程实践对在城市地铁使用井间电阻率成像方法进行溶洞探测提出现场工作和数值处理建议。
Aiming at a type of geological hazard body-karst cave that might be encountered in the construction of metro in the city, four typical karst caves are established. The numerical simulation of forward and inversions by finite element method and iteration method is used to obtain the crosswell resistance Rate imaging method to detect the typical cave response characteristics, analysis and summarize the response characteristics of different models, supplemented by Dalian Metro project examples to verify the actual detection of good application results. The results show that the crosswell resistivity imaging method is an effective method to detect caves in urban subway, which can provide corresponding safety assurance for urban subway construction. Based on numerical simulation and engineering practice, the cross-well resistivity imaging method Cave exploration proposed field work and numerical processing recommendations.