| 隧洞开挖过程初始地应力动态卸载效应研究 |
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| 引用本文： | 严鹏,卢文波,陈明,周创兵. 隧洞开挖过程初始地应力动态卸载效应研究[J]. 岩土工程学报, 2009, 31(12): 1888-1894 |
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| 作者姓名： | 严鹏 卢文波 陈明 周创兵 |
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| 作者单位： | 中国水电顾问集团华东勘测设计研究院;武汉大学水资源与水电工程科学国家重点实验室 |
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| 基金项目： | 中国博士后科学基金项目(200904501317);;国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合基金项目(50639100);;国家自然科学基金国家杰出青年科学基金项目(50725931);;国家自然科学基金面上项目(50779050);;湖北省自然科学基金杰出青年人才项目(2007ABB026) |
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| 摘 要： | 采用理论计算、数值模拟和工程实测资料验证相结合的方法分析了圆形隧洞钻爆开挖时开挖边界上初始应力场动态卸荷效应,并计算了其破坏范围。计算结果表明在高地应力条件下进行爆破开挖时,初始应力动态卸荷在岩体中所产生的损伤范围比准静态卸荷所产生的损伤范围要大;侧压力系数λ和极角θ是影响初始应力动态卸载应力场的两个主要因素;在一定的卸载速率条件下,侧压力系数λ越大,动态卸载效应越显著,其所产生的损伤范围也相应较大。工程实例证明了该结论的合理性。
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| 关 键 词： | 钻爆开挖 初始应力 动态卸载 准静态卸载 损伤范围 |
Effect of initial geo-stress dynamic unloading during tunnel excavation |
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| YAN Peng,LU Wen-bo,CHEN Ming,ZHOU Chuang-bing. Effect of initial geo-stress dynamic unloading during tunnel excavation[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(12): 1888-1894 |
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| Authors: | YAN Peng LU Wen-bo CHEN Ming ZHOU Chuang-bing |
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| Affiliation: | 1.East China Investigation and Design Institution,CHECC,Hangzhou 310014,China;2.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China |
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| Abstract: | Effect of the initial geo-stress unloading on the circular tunnel boundary is studied,and the damage area is calculated by use of combined method of theoretical analysis,numerical simulation by Dynamic FEM and verification with field monitoring vibration data.The results indicate that the damage area induced by the dynamic unloading is larger than that induced by the static unloading during blasting excavation.The main factors,which affect the dynamic stress of unloading,are side-face stress coefficient λ and angle θ.The larger the λ is,the more remarkable the unloading effect is,and the damage area is much bigger under given unloading rate.The results of theoretical analysis are validated by the monitoring damage data. |
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| Keywords: | drilling and blasting initial geo-stress dynamic unloading quasi-static unloading damage area |
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