地质体结构探测中可控爆源实验研究及应用

Experimental Research and Application of Controllable Blast Source on Surveying Geology Body Structure

为探测地质体的结构,在分析一般爆破震源的优缺点的基础上,通过实验研究了一种可以控制的爆破震源(简称可控爆源)。该震源利用水介质的均匀性及各向同性、不可压缩等特点,保持了爆炸波功率大、能够提供尖锐的脉冲信号、频域范围广的优点;同时利用水作为传递爆炸载荷的介质,减少了爆炸冲击波对周围岩体介质的损坏,使试验可以重复进行,改变了爆破震源不能重复和难以总结试验规律的缺点,也有助于可控爆源在地质勘探领域的推广应用。利用可控爆源,对茅坪滑坡体进行了地质体结构探测分析,结果显示滑坡体深约50 m处存在一大的结构面(滑带),并得到了上覆岩层的一般力学性质。该结果与钻孔勘探和挖竖井探测结果吻合,为该滑坡体的治理和预防提供了依据。

To explore geology body structure, a blast seismic source producing controllable seismic wave was tested. The controllable blast seismic source made use of the homogenization,isotropy, incompressibility of water to keep the blast wave power strong enough, meanwhile the sharp pulsing signal and wide frequency domain were provided. Due to the action of water mass, the damage to rock induced by explosion load was reduced. Moreover this test could be repeated and the blast load was easy to be calculated. The blast seismic source changes the characteristic that common blast seismic source cannot be repeated and was difficult to sum up the rule of blast seismic wave. The con- trollable blast seismic source was used to study the geology body structure of Maoping landslide mass. Result shows that slide strip lies 50 meters under the surface at the middle of landslide. The mechanics properties overlying rock mass were also obtained. The analytical results fits the survey by drilling and sinking a shaft well.