Experimental and Numerical Analysis of Rock Block Stability Using a Remotely Positioned Laser Doppler Vibrometer

This paper examines a new method of evaluating the stability of a rock slope using a remotely positioned LDV （laser Doppler vibrometer）. We conducted an experiment using physical models and performed a numerical analysis to evaluate the new method. The physical model included： （l） concrete blocks on an artificial soil slope with two block sizes and three slopes; （2） concrete blocks bonded to the concrete base with different contact area. The LDV measurements agreed with conventional seismometer measurements. The dominant frequency of the blocks varied with the stability and dominant frequency and the amplitude varied with the block size. The numerical model was used to examine a concrete block adhered to a concrete base with different contact areas. The dominant frequency of the blocks determined using the numerical model agreed with those obtained from the physical experiments. We analyzed different sized blocks to examine the scaling effects. The dominant frequency of the blocks was inversely related to the block size. These results demonstrated the effectiveness of LDV for evaluating the stability of rock slopes and cleared the block size scaling effects.

使用3分量伺服加速度计监测海底稳定性

为了检测甲烷释放期间海底的稳定性，我们需要不断测量海底的位移。在陆地上的滑坡点，滑坡移动的地表位移监测通常是使用滑觉传感器来进行的。这些仪器测量一个固定点与滑体测量点之间的相对位移。不过，这种方法不适用于海底的位移测量，因为在海底很难确定一个固定的参考点。

层析成像技术在工程场地勘察中的应用

引言地质层析成像是一种由地球物理技术测得的数据来重构地下介质物性剖面的方法。对不同物理现象和重构物性剖面有不同的层析图像。本文作者发展了下列三种层析成像技术,并将其应用于工程中大坝等场地地基的勘察。地震层析成像地震波速度分布的重构雷达层析成像电磁波速度分布的重构电阻率层析成像电阻率分布的重构使用这三种层析成像技术。