一发双收岩体超声波检测技术现场应用
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摘要
岩体声波测试技术是以声波在岩体中的传播特性与岩体的物理力学参数相关性为基础,通过测定声波在岩体中的传播特性参数,为评价工程岩体力学性质提供依据。该文介绍了岩体声波测试的基本原理和方法,并采用声波测试技术对某工程岩体48个勘察钻孔进行一发双收超声波检测。结果表明:地层岩体的纵波平均波速为2747 m/s,最小波速为2222 m/s,最大波速为3226 m/s,标准差为130 m/s,变异系数为0.047。岩石饱和单轴抗压强度为30.25 MPa,属较硬岩。岩块最大波速为4828 m/s,最小波速为4105 m/s,平均波速为4364 m/s。得出岩体完整性指数Kw=0.32,其岩体完整性等级为破碎,该场地岩体基本质量等级为Ⅳ级。研究结果可为该工程场地地层岩体稳定性提供依据。
The rock sonic wave testing technology is based on the correlation between the transmission characteristics of sonic waves in the rock mass and the physical and mechanical parameters of the rock mass. The determination of the transmission characteristics parameters of the sonic wave in the rock mass provides a basis for evaluating the mechanical properties of the rock mass in the engineering. In this paper, the basic principles and methods of rock sonic wave testing were introduced, and the sonic wave testing technology was adopted to conduct the ultrasonic wave testing with single-transmitter and dual-transceiver on the 48 exploration boreholes in the rock body of an engineering. The results showed that the average velocity of the longitudinal wave of the stratum rock mass is 2,747 m/s, with the minimum wave velocity of 2,222 m/s, the maximum wave velocity of 3,226 m/s, the standard deviation of 130 m/s, and the variation coefficient of 0.047. The compressive strength of the saturated uniaxial of the rock mass is 30.25 MPa, so it is hard rock. The rock has the maximum wave velocity of 4,828 m/s, the minimum of 5,105 m/s, and the average of 4,364 m/s. It is known that the rock integrity index Kw is 0.32, the rock integrity level is broken, and the basic quality of the rock mass is of grade IV. The research results can provide a basis for the stability of the stratum rock mass of this project site.
The rock sonic wave testing technology is based on the correlation between the transmission characteristics of sonic waves in the rock mass and the physical and mechanical parameters of the rock mass. The determination of the transmission characteristics parameters of the sonic wave in the rock mass provides a basis for evaluating the mechanical properties of the rock mass in the engineering. In this paper, the basic principles and methods of rock sonic wave testing were introduced, and the sonic wave testing technology was adopted to conduct the ultrasonic wave testing with single-transmitter and dual-transceiver on the 48 exploration boreholes in the rock body of an engineering. The results showed that the average velocity of the longitudinal wave of the stratum rock mass is 2,747 m/s, with the minimum wave velocity of 2,222 m/s, the maximum wave velocity of 3,226 m/s, the standard deviation of 130 m/s, and the variation coefficient of 0.047. The compressive strength of the saturated uniaxial of the rock mass is 30.25 MPa, so it is hard rock. The rock has the maximum wave velocity of 4,828 m/s, the minimum of 5,105 m/s, and the average of 4,364 m/s. It is known that the rock integrity index Kw is 0.32, the rock integrity level is broken, and the basic quality of the rock mass is of grade IV. The research results can provide a basis for the stability of the stratum rock mass of this project site.
引文
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[10]王新杰,杨进平,王营超,等.声波测试技术在地下油库选址勘查中的应用[J].工程地球物理学报,2013(5):648-651
[11]韩震,张德琦,吴强,等.岩体超声波测试探头耦合方法的改进[J].辽宁石油化工大学学报,2017(3).
[2]马荣田.岩体声波测试技术及其在巷道围岩岩体波速测试中的应用[J].铁道建筑,2006(10):37-40.
[3]沈昌贤,刘雁鹰.金堆城凹陷露天矿边坡岩体声波测试研究[J].中国钼业,2008(6):24-27.
[4]孙清祥,吴壮军.会泽铅锌矿一号矿体岩体声波测试研究[J].湖南有色金属,2004(2):5-7.
[5]张新鹏,严绍军,黄志义,等.花山岩画开裂岩体声波测试与分析[J].物探与化探,2014(5):1085-1089.
[6]张泽林,刘高.某地岩体声波测试及其成果分析[EBOL].[2011-03-27].https://www.docin.com/p-160433448.html?docfrom=rrela.
[7]李建林,周济芳.三峡工程卸荷岩体声波测试及其参数研究[C]//第九届全国岩石动力学学术会议论文集,2005.
[8]闫长斌,王贵军,石守亮,等.岩体爆破损伤声波测试信号频谱特征的小波(包)分析[J].岩石力学与工程学报,2010(7):1496-1502.
[9]胡刚.基于岩体声波损伤特性的露天台阶爆破试验[J]煤炭学报,2009(7):917-921.
[10]王新杰,杨进平,王营超,等.声波测试技术在地下油库选址勘查中的应用[J].工程地球物理学报,2013(5):648-651
[11]韩震,张德琦,吴强,等.岩体超声波测试探头耦合方法的改进[J].辽宁石油化工大学学报,2017(3).