DCIF Westerly Granite AE Stress Effect Test (Task 3-1)

Directional Cooling-Induced Fracturing (DCIF) experiments were conducted on rectangular Westerly granite blocks (width=depth=4.0", height=2.0"). Liquid nitrogen was poured in a small, 1"-diameter copper cup attached to the top of the sample, and the resulting acoustic emissions (AEs) and temperature changes on the surface of the sample were monitored. Several confining stresses were applied bi-axially to the sides of the samples so that the onset of AE activity and the stress applied to the sample were correlated. The obtained AEs were used to determine the microcracking source locations and amplitude, and the associated moment tensors. Included in this submission are the animations of the AE locations and graphics displaying the measured temperature-AE activity changes for different stresses.

在矩形西里利安花岗岩块（宽度=深度=4.0英寸，高度=2.0英寸）上进行了定向冷却诱导裂隙（DCIF）实验。将液氮倒入固定于样品顶部的小型1英寸直径铜杯中，并监测了样品表面的声发射（AEs）和温度变化。对样品两侧施加了多个围压，以便将声发射活动的开始与施加到样品上的应力相关联。所获得的声发射被用于确定微裂纹源位置和振幅，以及相应的矩张量。本次提交中包含声发射位置的动画和不同应力下测量到的温度-声发射活动变化图形。