锚杆锚固体系弹性波场的有限差分数值模拟  

The finite difference numerical simulation of elastic wave field of anchoring quality of rock bolts

作　　者：刘黎[1] 陈义群[1] 刘玉[2] 滑玉琎 章成广[1] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [2]武汉大学测绘学院武汉市珞喻路129号,武汉430079

出　　处：《地球物理学进展》2015年第5期2379-2385,共7页Progress in Geophysics

基　　金：国家自然科学基金资助项目(41474117);国家自然科学基金资助项目(41274141)联合资助

摘　　要：针对当前锚杆锚固质量弹性波检测理论研究工作欠缺的问题,开展了锚杆锚固体系条件下弹性波传播的正演问题研究.论文编写了二维弹性波交错网格有限差分程序,并在围岩、砂浆及缺陷等各种因素变化的条件下进行了相应的数值模拟计算.通过对计算结果的分析,获得了两个重要结论:1)围岩及砂浆的波速变化不会影响锚杆杆底反射波的波至时间,但其频率会随之有所降低;2)砂浆缺陷的大小会影响锚杆杆底反射波的振幅.砂浆缺陷越大,钢筋底部反射波的振幅越大.论文指出:上述结论可能会为锚杆锚固体系砂浆饱满度的求取提供一种新的途径.Aim at the short of theoretical research existing in the anchoring quality of rock bolts,some studies about the elastic wave method are made.By using staggered grid finite difference method,we simulate the two dimension elastic wave under different conditions,such as the influence of surrounding rock, mortar condition and its defects. The results of simulation show that the changing of wave velocity of the surrounding rock and the mortar have no effect upon the arrival time of reflection wave from the bottom of the steel rebar,but they affect the reflection wave＇s frequency,and the mortar defects have some influence on the reflection wave＇s amplitude,the larger the mortar defects,the greater the reflection wave＇s amplitude.This paper also proposes a new way of mortar compactness computing in the anchoring quality of rock bolts.

关 键 词：锚杆 无损检测 弹性波场 数值模拟 有限差分 

分 类 号：P631[天文地球—地质矿产勘探]