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Detection method and system for analyzing pile foundation based on cross-hole resistivity method CT inversion imaging
The invention provides a detection method and system for analyzing a pile foundation based on cross-hole resistivity method CT inversion imaging. The detection method comprises the steps that the distribution range, size, shape and size of a pile foundation group, soil layer medium distribution around a pile foundation and interface conditions are determined, an initial pile foundation group modelis established, the grid size is preset through a finite element method, and an initial resistivity value is set; forward modeling is carried out on each foundation pile in the pile foundation groupby adopting a cross-hole resistivity CT method symmetrical electrode layout mode to obtain corresponding apparent resistivity forward modeling result parameters, and an inversion result is acquired according to a least square inversion operation method; the inversion result is compared with the actual stratum condition and the pile foundation condition, and the grid size and the electrode intervalare adjusted until the inversion result is compared with the actual condition to obtain the optimal parameter of the electrode interval; and according to the optimal parameters of the electrode interval, inter-well cross-hole resistivity CT is adopted at a test site for on-site detection, experimental data are obtained, and inversion mapping is carried out.
本发明提供了基于跨孔电阻率法CT反演成像分析桩基的探测方法及系统。其中，该探测方法，包括确定桩基群的分布范围、尺寸形状及大小，桩基周围土层介质分布及分界面情况，建立初始桩基群模型，通过有限元方法预设网格尺寸，并设置初始电阻率值；采用跨孔电阻率CT方法对称电极布设方式对桩基群中各个基桩进行正演，得出相应的视电阻率正演结果参数，进而根据最小二乘法反演运算方法，得到反演结果；通过反演结果与实际地层情况和桩基情况进行对比，调整网格尺寸和电极间隔，直到反演结果与实际情况，得到电极间隔的最优参数；根据电极间隔最优参数，在试验现场采取井间跨孔电阻率CT进行实地探测，得出实验数据，进行反演成图。
Detection method and system for analyzing pile foundation based on cross-hole resistivity method CT inversion imaging
The invention provides a detection method and system for analyzing a pile foundation based on cross-hole resistivity method CT inversion imaging. The detection method comprises the steps that the distribution range, size, shape and size of a pile foundation group, soil layer medium distribution around a pile foundation and interface conditions are determined, an initial pile foundation group modelis established, the grid size is preset through a finite element method, and an initial resistivity value is set; forward modeling is carried out on each foundation pile in the pile foundation groupby adopting a cross-hole resistivity CT method symmetrical electrode layout mode to obtain corresponding apparent resistivity forward modeling result parameters, and an inversion result is acquired according to a least square inversion operation method; the inversion result is compared with the actual stratum condition and the pile foundation condition, and the grid size and the electrode intervalare adjusted until the inversion result is compared with the actual condition to obtain the optimal parameter of the electrode interval; and according to the optimal parameters of the electrode interval, inter-well cross-hole resistivity CT is adopted at a test site for on-site detection, experimental data are obtained, and inversion mapping is carried out.
本发明提供了基于跨孔电阻率法CT反演成像分析桩基的探测方法及系统。其中，该探测方法，包括确定桩基群的分布范围、尺寸形状及大小，桩基周围土层介质分布及分界面情况，建立初始桩基群模型，通过有限元方法预设网格尺寸，并设置初始电阻率值；采用跨孔电阻率CT方法对称电极布设方式对桩基群中各个基桩进行正演，得出相应的视电阻率正演结果参数，进而根据最小二乘法反演运算方法，得到反演结果；通过反演结果与实际地层情况和桩基情况进行对比，调整网格尺寸和电极间隔，直到反演结果与实际情况，得到电极间隔的最优参数；根据电极间隔最优参数，在试验现场采取井间跨孔电阻率CT进行实地探测，得出实验数据，进行反演成图。
Detection method and system for analyzing pile foundation based on cross-hole resistivity method CT inversion imaging
基于跨孔电阻率法CT反演成像分析桩基的探测方法及系统
2020-04-10
Patent
Electronic Resource
Chinese
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