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随着四化建设的需要,我国地下工程建设日益发展,并逐步推广喷锚技术.我院采用自制的松动圈声波测量设备,对引滦输水工程八一林隧洞(断面的宽×高为9.30米×7.50米),配合喷锚施工进行围岩松动圈声波测试.实测岩体纵波速度表明:光面爆破的影响范围为0.2～0.4米;松动圈厚度0.9～1.1米,平均1米;在1～2米处形成承载圈,因而设计选用3米长锚杆是合理的;指出了原岩状态波速大于5000米/秒者应属于稳定状态,光面爆破后立即喷水泥砂浆,是可以满足稳定要求的.
With the need of the four modernizations, the construction of underground engineering in our country is developing day by day, and the technique of spraying anchor is gradually popularized.Our institute adopts self-made loose ring acoustic wave measuring equipment to measure the tunnels of Bayi-Lin tunnel (the width × height is 9.30 m × 7.50 m), the acoustic wave test of the rock loosening ring was carried out in conjunction with the spray anchor construction.The measured P-wave velocity showed that the influence range of the smooth blasting was 0.2-0.4 m, the thickness of the loose ring was 0.9-1.1 m, an average of 1 m, It is reasonable to design a 3m long anchor rod for the design of the bearing ring at 1 ~ 2m. It is pointed out that when the wave velocity of the original rock is more than 5000m / s, it should be in a stable state. It is acceptable to spray the cement mortar immediately after smooth blasting To meet the stability requirements.