活性炭测氡法监测煤岩水力压裂裂缝的试验

摘要

根据活性炭测氡法的原理和煤岩水力压裂的原理,尝试应用该方法对煤岩水力压裂过程中产生的裂缝进行监测,在山西长治进行了4次监测试验.通过对试验区域压裂之前以及之后3年的地表氡值的观测对比,发现煤岩压裂以后地表出现了明显的氡异常,随着时间的推移,氡异常的范围逐渐减少并趋于消失,这说明活性炭测氡法能够对由煤岩水力压裂产生的扰动有所响应.%According to the principle of hydraulic fracturing and active carbon radon measuring method,we try to apply active carbon radon measuring method to monitor cracks in coal rock by hydraulic fracturing.Four experiments were carried out in Changzhi city of Shanxi province.By comparing the radon value before and after fracturing within three years,we found that radon appeared obvious anomaly on the ground after fracturing.With the passage of time,the range of radon anomaly gradually decreases and tends to disappear.The results show that the method of active carbon measuring radon can respond to the disturbance caused by hydraulic fracturing of coal and rock.