【摘要】 以曲靖电厂冷却塔为例,叙述桩位下浅层基岩内的洞穴勘探方法。采用高频地震勘探仪系统,或在桩底原位激发、接受震波,或几个桩底联测,互为激发、接受震波,或将两者合并进行。通过对震波的震相、周期和振幅等特征的分析确定桩位下浅层基岩内是否存在洞穴。震波周期大,反射波到时早,则在浅层基岩内存在洞穴;而周期小,且无反射波者,在浅层基岩内没有洞穴。更多还原

【Abstract】 In this paper the author introduces the method which it is used to prospect for cavities in the rock-mass below the water tower for Qujing Power-house. One method is that, it is excited by hammer or micro-rocket on the bottom of pile, and seismic wave is received by transducer on one of same pile; mother method is that, it is excited by hammer or microrocket on the bottom of this pile, and seismic wave is received by transducer on one of other pile; third one is that it is combined to use above methods by seismograph-system with high frequency. It is confirmed whether there are cavities or not in the rock-mass below piles by analyzing phase, period and amplitude etc characteristic. Period of waves is larger, an arrival of reflect-wave is earlier, and there are cavities in the rock-mass below piles. Period of waves is smaller, an arrival of reflect-wave is later, and there are not cavities in the lock-mass below piles.更多还原