钻孔脉动测试设备及测试方法研究

Research of bore-hole microtremor testing equipment and testing methods

钻孔脉动测试是一种新型的原位测试方法,利用该方法可直接测量深部土层的地脉动,取得深部土层的动力特性参数。本文研发了一种适用于钻孔脉动的测试设备-BMT-Ⅰ型钻孔脉动测试设备,该设备具有以下特点:传感器低频优势明显;一机多用,不仅可用于场地地表、钻孔脉动测试,还可用于波速测试;贴壁装置操作简便快捷,贴壁效果良好;可用于钻孔水下及淤泥等测试环境。根据设备测试方法,进行工程实测,结果表明:利用该测试设备和测试方法进行钻孔脉动测试是可行的,测试精度和准确性满足工程测试要求,为岩土工程原位勘察提供了一种可行的测试方法。

Bore-hole microtremor test is a new method of in situ testing,which can directly measure microtremor signal and acquire the dynamic parameters of a deep soil layer.A testing equipment-BMT-I bore-hole microtremor testing equipment is introduced,with the following characteristics:the sensor of the equipment has excellent low frequency characteristics;it can be used not only for ground and bore-hole microtremor test but also for wave velocity test;the operation of the attached system is simple and convenient,and the adherence effect is good;it works well in the underwater and even in silt environment.The engineering site test is conducted,and the test results indicate that it is feasible to use the equipment and method for engineering site test and the accuracy meets engineering requirements.It provides a feasible test method for geotechnical engineering in situ investigation.