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为了有效地检测基坑围护结构的渗漏隐患,保证基坑施工安全,以电极管探测理论为理论基础,推导出微测井电法探测范围的理论模型。分别利用AM法与AMN法对现场隔水幕布(研究对象)进行横向裂缝探测与竖向裂缝探测的数值模拟研究,研究结果表明:AM法对横向裂缝的感知能力大于竖向裂缝的感知能力,AMN法对竖向裂缝的感知能力大于横向裂缝的感知能力;分析电极管距、电极极距和裂缝尺寸对微测井电法探测敏感度的影响,研究结果表明:AM装置敏感度主要与电极极距和待测裂缝宽度有关,AMN装置敏感度主要与电极管距和待测裂缝长度有关,并针对工程实际提出参数设置的一般要求,通过物理模拟与工程中的实际应用,验证了微测井电法理论在地连墙防渗检测中的可靠性与准确性,实现了检测过程的等效简化。
In order to effectively detect the potential leakage of the retaining structure of the foundation pit and ensure the construction safety of the foundation pit, the theoretical model of the detection range of the micro-logging electrical method is deduced based on the theory of the electrode-pipe detection. The AM and AMN methods were used to study the transverse crack detection and vertical crack detection of the on-site water-repellent curtain (research object) respectively. The results show that the AM method is more sensitive to lateral cracks than to the vertical cracks, AMN method is more sensitive to vertical cracks than horizontal cracks. The influence of electrode pitch, electrode pitch and crack size on detection sensitivity of micro-logging is analyzed. The results show that the sensitivity of AM device is mainly related to the electrode The polar distance is related to the width of the crack to be measured. The sensitivity of the AMN device is mainly related to the electrode tube pitch and the length of the crack to be measured. The general requirements for the parameter setting are put forward according to the actual project. Through the physical simulation and practical application in the project, Wells electrical law theory in the wall impermeable detection of the reliability and accuracy of the detection process to achieve the equivalent simplification.