| 洞室开挖卸荷作用下岩体裂纹动态应力强度因子分析 |
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| 引用本文： | 吴 亮,朱红兵,王秀娟.洞室开挖卸荷作用下岩体裂纹动态应力强度因子分析[J].岩土力学,2006,27(Z1):179-182. |
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| 作者姓名： | 吴 亮 朱红兵 王秀娟 |
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| 作者单位： | 武汉大学 水资源与水电工程科学国家重点实验室，武汉 430072 |
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| 摘 要： | 在线弹性变形假设的情况下，以龙滩水电站地下厂房开挖为例和以ANSYS数值计算软件为平台，计算了在爆破荷载和初始地应力卸荷荷载作用下岩体裂纹的动态应力强度因子。计算表明，在中高地应力地区的爆破破岩过程中，虽然炮孔附近的裂纹扩展和岩体损伤主要由爆破荷载引起的，但岩体初始地应力的动态卸荷可能是引起保留岩体中远区松动及原有裂纹扩展的重要因素之一。
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| 关 键 词： | 岩石力学 爆破荷载 初始应力 动态因子 |
| 收稿时间： | 2006-04-04 |
Analysis of dynamic stress intensity factor of rock mass
under excavation unloading in underground caverns |
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| WU Liang,ZHU Hong-bing,WANG Xiu-juan.Analysis of dynamic stress intensity factor of rock mass
under excavation unloading in underground caverns[J].Rock and Soil Mechanics,2006,27(Z1):179-182. |
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| Authors: | WU Liang ZHU Hong-bing WANG Xiu-juan |
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| Institution: | State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China |
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| Abstract: | Based on linear elastic assumption and ANSYS software, taking the excavation of underground powerhouse of Longtan Project for example, the dynamic stress intensity factor under blasting load and unloading of initial stress is calculated. The results show that the crack propagation and rock mass damage near borehole are due to blasting load in the process of fragmentizing rock by blasting in medium high ground stress region. But the dynamic unloading of initial stress is the key factor which induces the loose of reserved rock in medium long region and the propagation of original crack. |
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| Keywords: | rock mechanics blasting loading initial stress dynamic factor |
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