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在成都地铁2号线盾构施工过程中,由于成都地层特有的砂卵石层地质结构,产生地表滞后沉降问题.论文首先对此问题,建立了以空隙率为表征的地下介质扰动随时间发展的四个阶段的数值模型,应用有限差分数值模拟方法论研究和分析了源于滞后沉降的地下扰动不同发展时期的探地雷达反射波特征.然后结合成都地铁2号线盾构施工滞后沉降监测的对应的四个阶段探地雷达数据,分析了实际的滞后沉降地下扰动不同发展时期的雷达特征和灌浆治理效果的评价.论文通过数值模拟与实际雷达资料的对比研究结果,可为类似的城市地铁地表滞后沉降的探测和检测方法提供理论和技术的支持.
During the construction of shield tunnel in Chengdu Subway Line 2, due to the geological structure of the sand-gravel layer in Chengdu strata, the problem of surface subsidence and settlement has arisen.In this paper, firstly, the disturbance of subterranean media characterized by porosity was developed over time Four stages of numerical model, the application of finite difference numerical simulation method to study and analyze the characteristics of ground-wave radiated from ground-based radar with delayed settlement from different stages of development.Secondly, combined with the monitoring of lag settlement of shield metro line 2 Of the four stages of ground penetrating radar data, analysis of the actual lag subsidence of underground disturbance during different development characteristics of radar characteristics and evaluation of grouting effect.Through the numerical simulation and the actual radar data, the results of the study can be similar to the city subway surface The methods of detection and detection of lag subsidence provide theoretical and technical support.