Detecting anomalies in diaphragm walls with electrical resistance measurements
Detecting anomalies in diaphragm walls with electrical resistance measurements
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DOI：
10.3997/1873-0604.2016022
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发表时间：
2016-12
影响因子：
1.6
通讯作者：
R. Spruit;V. F. Tol;W. Broere;E. Slob
中科院分区：
文献类型：
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作者：
R. Spruit;V. F. Tol;W. Broere;E. Slob
地下连续墙开挖前的质量控制往往是一个难题。一种可用于检测连续墙异常的技术涉及电阻。跨连续墙的电阻测量可以（在严格的框架内）用于验证连续墙中是否存在泄漏，作为井间声波测井的补充。本研究通过对测试墙周围的测量得出结论，随着测量电极与测试墙之间距离的增加，电阻异常的可探测性呈指数下降。比较了两个电极和四个电极的电阻设置。为了获得可用的结果，必须使用四电极装置，其中电位电极需要放置在非常靠近墙壁的地方（小于0.2米）。根据试验经验，提出了一种由地下连续墙组成的建筑坑的现场验证装置，以及一种确定由地下连续墙构成的码头墙中覆盖钢筋的混凝土质量的装置。
Quality control of diaphragm walls prior to excavation is often difficult. One technique that can be used to detect anomalies in diaphragm walls involves electrical resistance. Electrical resistance measurements across a diaphragm wall can (within a strict framework) be used to verify the presence of leaks in diaphragm walls as a supplement to crosshole sonic logging. From measurements around a test wall conducted in this study, it is concluded that the detectability of anomalies with electrical resistance decreases exponentially with the increasing distance between the measurement electrodes and the wall. Electrical resistance setups with two and four electrodes have been compared. For usable results, a four-electrode setup must be used in which the potential electrodes need to be placed very close to the wall (less than 0.2 m away). Based upon the test experience, a field setup for verification of a building pit consisting of diaphragm walls is suggested, as well as a setup for determining the quality of the concrete covering the rebar in quay walls constructed with diaphragm walls.