Acoustic emission monitoring of a soil slope: Comparisons with continuous deformation measurements
Acoustic emission monitoring of a soil slope: Comparisons with continuous deformation measurements
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DOI：
10.1680/geolett.14.00053
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发表时间：
2014-10-01
影响因子：
2.1
通讯作者：
Chambers, J.
中科院分区：
文献类型：
--
作者：
Smith, A.;Dixon, N.;Chambers, J.
声发射（AE）已成为监测土质边坡稳定性的一种成熟方法。然而，挑战一直是制定战略，解释和量化的变形行为从测量的AE。本文介绍了连续AE（使用有源波导测量）和连续地下变形测量的第一次比较。有源波导通过斜坡安装在井孔中，并且包括具有颗粒回填围绕物的金属波导杆或管。当主体斜坡变形时，粒状回填物柱也变形，从而产生可以沿着波导传播的AE。本文介绍了在英国北约克郡的一个重新活化的土壤边坡的现场试验结果。测量结果证实，所产生的AE率与斜坡运动的速度成正比（例如，为一系列斜坡运动事件确定的AE率与速度的关系产生的R-2值为0.8），并证明了有源波导的AE监测性能，以提供高时间分辨率的斜坡位移和位移率的连续信息。
Acoustic emission (AE) has become an established approach to monitor the stability of soil slopes. However, the challenge has been to develop strategies to interpret and quantify deformation behaviour from the measured AE. This paper presents the first comparison of continuous AE (measured using an active waveguide) and continuous subsurface deformation measurements. The active waveguide is installed in a borehole through a slope and comprises a metal waveguide rod or tube with a granular backfill surround. When the host slope deforms, the column of granular backfill also deforms, generating AE that can propagate along the waveguide. This paper presents results from a field trial at a reactivated soil slope in North Yorkshire, UK. The measurements confirm that AE rates generated are directly proportional to the velocity of slope movement (e.g. the AE rate versus velocity relationship determined for a series of slope movement events produced an R-2 value of 0.8) and demonstrate the performance of AE monitoring of active waveguides to provide continuous information on slope displacements and displacement rates with high temporal resolution.