FREE-FIELD STRESS WAVE PROPAGATION INDUCED BY UNDERGROUND CHEMICAL EXPLOSION IN GRANITE
花岗岩中化爆的自由场应力波传播规律分析

The test data are interpreted of the free-field stress wave of a series of chemical explosion from 1 to 150 kg TNT in granite. The stress wave attenuation law is found for different rock conditions,in which the ground motion parameter is of stronger regularity. Compared with the result of nuclear explosion,the stress wave attenuation of the chemical explosion is faster,because it is more sensitive to the local rock condition in small charge. According to the test result,under given rock condition and engineering construction status,the reason why the measured stress is low and scattered is analyzed. Some problems about in-situ measurement of stress wave are discussed. The conclusion is given out that the peak stress calculated from the particle velocity can reflect the stress field more clearly than the stress measured directly.