花岗岩中化爆的自由场应力波传播规律分析

总结分析了在花岗岩中进行的l～150kg TNT系列化爆试验的应方波测试数据，按岩性区分，给出了相应的自由场应力波衰减规律，其地运动参数的规律较强。与核爆结果对比表明，化爆试验的应力波衰减较快，其原因在于小药量化爆的应力波传播对岩体状况较敏感。基于化爆试验测试结果和现场岩性及工程施工状况，分析了应力测值偏低和分散的原因，讨论了现场应力波测试中所需注意和解决的问题，指出用粒子速度测值转换的应力比直接测量的应力更能反映现场岩体中的应力状况。

FREE-FIELD STRESS WAVE PROPAGATION INDUCED BY UNDERGROUND CHEMICAL EXPLOSION IN GRANITE

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.