| 深埋隧洞爆破开挖荷载诱发围岩损伤特性 |
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| 引用本文： | 严 鹏,李 涛,卢文波,陈 明,周创兵.深埋隧洞爆破开挖荷载诱发围岩损伤特性[J].岩土力学,2013,34(Z1):451-457. |
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| 作者姓名： | 严 鹏 李 涛 卢文波 陈 明 周创兵 |
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| 作者单位： | 1. 武汉大学 水资源与水电工程科学国家重点试验室，武汉 430072；2. 武汉大学 水工岩石力学教育部重点试验室，武汉 430072 |
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| 基金项目： | 国家973计划项目(No.2010CB732003)；国家自然科学基金杰出青年基金项目（No.51125037）；国家自然科学基金面上项目（No.51009013，No.51179138） |
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| 摘 要： | 深埋隧洞爆破开挖荷载构成复杂，对围岩损伤区的孕育发展具有重要影响。利用颗粒流程序（PFC）软件，讨论了不同初始地应力状态下爆炸荷载及地应力瞬态卸载所分别诱发围岩损伤的特性，并通过锦屏2级水电站引水隧洞爆破开挖损伤区检测数据对数值模拟的结果进行了验证。研究表明，爆炸荷载和地应力瞬态卸载所诱发的围岩损伤程度和范围均随地应力量级的提高而显著增大；爆炸荷载作用条件下损伤区的分布有随着侧压力系数的增大而向应力集中区发展的趋势，而地应力瞬态卸荷所产生的围岩破坏以受拉破坏为主，表层损伤区沿开挖呈轮廓均匀分布的趋势；在相同的初始地应力状态下，爆炸荷载和地应力瞬态卸荷所分别诱发的围岩损伤区深度均明显小于实测值，考虑二者的耦合效应后，计算值与实测值基本吻合。这说明这两种荷载是高应力条件下爆破开挖荷载的主要成分，但二者耦合作用对围岩的损伤大于它们单独作用效应的线性叠加。
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| 关 键 词： | 深埋隧洞 爆破开挖 损伤 瞬态卸荷 |
| 收稿时间： | 2013-05-10 |
Properties of excavation damaged zone under blasting load in deep tunnels |
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| YAN Peng,LI Tao,LU Wen-bo,CHEN Ming,ZHOU Chuang-bing.Properties of excavation damaged zone under blasting load in deep tunnels[J].Rock and Soil Mechanics,2013,34(Z1):451-457. |
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| Authors: | YAN Peng LI Tao LU Wen-bo CHEN Ming ZHOU Chuang-bing |
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| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China |
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| Abstract: | The excavation loads during blasting of deep tunnels are very complex; and it may have important influence on the development of excavation damage zone. Using PFC(particle flow code), the characteristics of surrounding rock damage zone induced by blasting load and in-situ stress transient unloading respectively under different in-situ stress conditions are discussed; and through the blasting excavation damage zone detection data of the Jinping П diversion tunnel, the results of numerical simulation are verified. Researches show that the degree and range of surrounding rock damage zone induced by blasting load or in-situ stress transient unloading will increase significantly with the increase of in-situ stress degree; the damage zone will mainly appear in the area of stress concentration as the lateral pressure coefficient increased under the conditions of blasting load, the surrounding rock failure induced by in-situ stress transient unloading is mainly composed of tensile failure, the surface damage zone will uniformly distribute on excavation face; the depth of surrounding rock damage zone induced by blasting load and in-situ stress transient unload respectively under the same in-situ stress are all significantly less than the measured values, which in agreement with the measured values when considering the coupling effect of the two load. It is shown that this two kinds of loads are the main components of blasting excavation load under high stress conditions; but the surrounding rock damage zone induced loads by the coupling action of this two kinds of loads is bigger than the linear superposition of their separate effects. |
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| Keywords: | deep tunnels blasting excavation damage transient release |
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