反射波等时圆在岩体节理反演中的应用
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摘要
节理对岩体工程有重要的影响,采用应力波反演节理产状有重要的工程意义。从振源点发出的应力波经节理面反射后返回地面,利用解析几何理论,根据点、线、面的相互关系,经过严密推导,得出该反射波走时公式,该公式建立了节理真倾向、真倾角值与地面测点走时的直接关系,描述出的地面反射波等时圆概念清晰、明确。实测时,绕发射点环形布置测点,利用MATLAB平台上编写的程序,搜寻出等时圆圆心后,再结合任一测点走时即可反演节理产状。
Joints are crucial factors in rock masses engineering,so using stress waves to invert joint attitude is a valuable practice.The stress wave emitted from a vibration source is reflected by joints and returns to the ground.A formula to calculate the reflected wave travel time was deduced using analytic geometry theory.In the formula,a direct relationship was established between a joint's real dip angle,real dip direction and the travel time at test spots on the ground.The reflected wave's isotravel time circle described by the formula has a clear conception and a definite meaning.Using the program on the MATLAB platform,this formula can be applied to invert the joint attitude by searching the center of the circle based on the measured travel time at the testing spots around the wave source.
Joints are crucial factors in rock masses engineering,so using stress waves to invert joint attitude is a valuable practice.The stress wave emitted from a vibration source is reflected by joints and returns to the ground.A formula to calculate the reflected wave travel time was deduced using analytic geometry theory.In the formula,a direct relationship was established between a joint's real dip angle,real dip direction and the travel time at test spots on the ground.The reflected wave's isotravel time circle described by the formula has a clear conception and a definite meaning.Using the program on the MATLAB platform,this formula can be applied to invert the joint attitude by searching the center of the circle based on the measured travel time at the testing spots around the wave source.
引文
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[2]WU Y K.Propagation characteristics of blast-inducedshock waves in jointed rock mass[J].Soil Dynamics andEarthquake Engineering,1998(17):407-412
[3]王鲁明,赵坚,华安增,等.节理岩体中应力波传播规律研究的进展[J].岩土力学,2003,24(Sup.):602-610.WANG Lu-ming,ZHAO Jian,HUA An-zeng,et al.The progress in study of regularity of a stress wavepropagation in the jointed rock mass[J].Rock and SoilMechanics,2003,24(Sup.):602-610.(in Chinese)
[4]郭文章,王树仁,陈寿峰.岩体中的节理对爆破作用的影响[J].爆炸与冲击,1999,2(2):143-146.GUO Wen-zhang,WANG Shu-ren,CHEN Shou-feng.Effect of joint on rock mass under blasting[J].Explosionand Shock Waves,1999,2(2):143-146.(in Chinese))
[5]汪东云.工程地质与水文地质[M].重庆:重庆大学出版社,1994.
[6]许年春.岩体节理多参数反演的反射波法研究[D].重庆:重庆大学,2007.
[7]何樵登.地震勘探原理和方法[M].北京:地质出版社,1986.
[8]张作平,刘兵.浅层工程勘探技术在工程建设区断裂构造勘测和岩性评价工作中的应用前景[J].岩石力学与工程学报,2002,21(增):2 605-2 608.ZHANG Zuo-ping,LIU Bing.Application prospect ofshallow-project seismic exploration technique in fracturestructures and rock property assessment[J].ChineseJournal of Rock Mechanics and Engineering.2002,21(supp.):2 605-2 608(in Chinese).
[9]张广忠,刘貅生.浅层地震技术在隧道勘察中的应用[J].煤田地质与勘察,1998,26(增):49-52.ZHANG Guang-zhong,LIU Xiu-sheng.Application ofshallow seismic technique in tunnel prospecting[J],GoalGeology&Exploration.1998,26(Sup.):49-52(inChinese).
[10]许明,张永兴,李燕.锚杆动测问题的解析解[J].重庆建筑大学学报,2003,25(2):48-53.XU Ming,ZHANG Yong-xing,LI Yan.Analyticsolution of anchor bolts with dynamic detection[J].Journal of Chongqing Jianzhu University,2003,25(2):48-53(in Chinese).
[11]许年春,石东虹,张秋.反射波初至时刻判断中的信号对比法[J].重庆交通大学学报.2007,26(6):108-111XU Nian-chun,SHI Dong-hong,ZHANG Qiu.Themethod of signal comparison be used to judge thearriving time for reflected wave[J].Journal ofChongqing Jiaotong University.2007,26(6):108-111(inChinese).
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