球面波传播特性和围岩动态裂纹产生的数值试验研究  

Numerical test study on spherical explosive wave propagating characteristics and dynamical crack production in wall rock

作　　者：杨自友[1] 张速[1] 顾金才[2] 杨本水[1] 李永池[3] 

机构地区：[1]安徽建筑工业学院土木工程学院,合肥230022 [2]总参工程兵科研三所,河南洛阳471023 [3]中国科学技术大学近代力学系,合肥230026

出　　处：《振动与冲击》2010年第5期110-113,共4页Journal of Vibration and Shock

基　　金：安徽省高等学校省级优秀青年人才基金项目(2010SQRL086)资助;安徽建筑工业学院博士基金会(2009)资助

摘　　要：利用非线性动力有限元分析程序,对于半无限岩土介质中的洞室,研究了球面波在围岩中的传播特性和动态裂纹的产生过程,比较了球面波在毛洞和锚杆加固洞室围岩中的衰减规律和动态裂纹形态的差别。结果表明:围岩动态裂纹是自由面产生的反射拉伸波及其相互叠加以及加固区与未加固区相互错动剪切的综合作用造成的;球面波强度在毛洞围岩中的衰减速度比在加固洞室中的快;锚杆加固洞室的破坏程度比毛洞轻一些;将模拟所得加固洞室围岩破坏形态与相应模型试验的结果进行了比较,发现洞室破坏形态及规律较为一致,说明了数值分析结果是可信的。研究结果对球面波的认识和防护工程的加固设计具有较好的参考价值。By a nonlinear dynamic finite element program,spherical explosive wave propagating characteristics and process of dynamical crack production were studied for semi-infinite rock and soil medium containing an underground cavern.The differences of spherical explosive waves' attenuation law and forms of dynamical cracks in unreinforced and reinforced zones with rock bolted underground cavern were compared respectively.The results indicated that the dynamical cracks of wall rocks are caused by synthetical actions containing the tensile waves reflected by free plane and their superposition and the shear between unreinforced and reinforced zones;the attenuation speed of spherical explosive waves in the unreinforced underground cavern is faster than that in the reinforced underground cavern;the reinforced underground cavern's damage level is lighter than that of the unreinforced underground cavern;the forms of the dynamical cracks of numerical simulation are compared with the corresponding results of the model test;some parts of the model test data are compared with the results of numerical simulation;the damage forms and laws of the dynamical cracks of underground caverns are consistent between numerical simulation and model test;this showed the results of numerical simulation are credible.The results provided a reference for understanding spherical explosive waves and reinforced designs of protection engineering.

关 键 词：球面波 传播特性 动态裂纹 抗爆性能 数值试验 

分 类 号：TU457[建筑科学—岩土工程]