| 基于强度折减原理的地下洞室群整体安全系数计算方法探讨 |
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| 引用本文： | 江权,冯夏庭,向天兵.基于强度折减原理的地下洞室群整体安全系数计算方法探讨[J].岩土力学,2009,30(8):2483-2488. |
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| 作者姓名： | 江权 冯夏庭 向天兵 |
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| 作者单位： | 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉,430071 |
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| 基金项目： | 国家科技支撑计划项目，中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室开放基金，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研究基金项目 |
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| 摘 要： | 为解决大型地下洞室群的整体稳定性评价这一难题,吸收边坡强度折减有限元的优点,提出了基于强度折减技术的地下洞室群整体安全系数求解方法.该方法采用Mohr-Coulomb屈服准则,以洞室之间的等效塑性应变贯通作为洞室群整体失稳的临界判据.洞群整体安全系数计算是通过搜索折减系数F,将岩土材料的力学强度参数(黏聚力c和内摩擦角()按F值折减代入数值计算中,使计算模型的洞室间正好出现明显的贯通性等效塑性应变来实现.拉西瓦水电站地下发电枢纽洞室群和锦屏二级水电站A、B辅助洞两个典型工程实例的整体安全系数计算表明,该方法可以便捷、客观地获得洞室群的整体安全系数,可为大型地下多洞室的稳定性评价和开挖与支护设计提供定量指标和科学依据.
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| 关 键 词： | 岩石力学 地下洞室群 安全系数 强度折减 稳定性分析 |
| 收稿时间： | 2008-10-22 |
Discussion on method for calculating general safety factor of underground caverns based on strength reduction theory |
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| JIANG Quan,FENG Xia-ting,XIANG Tian-bing.Discussion on method for calculating general safety factor of underground caverns based on strength reduction theory[J].Rock and Soil Mechanics,2009,30(8):2483-2488. |
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| Authors: | JIANG Quan FENG Xia-ting XIANG Tian-bing |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The safety of underground caverns is a key problem of large substructure work for designer. A new method to calculate the general safety factor of underground multi-cavern is put forward, which is based on the strength reduction technique. The method adopts the Mohr-Coulomb rule as the strength yield criterion and takes the transfixion of equivalent plastic strain in wall rock between caverns as the critical failure criterion of caverns. By reducing rock material strength parameters (cohesion c and friction angle φ) step by step, the general safety of caverns is obtained when the result of simulated excavation shows that the equivalent plastic strain of wall rock becomes transfixion, which is the critical state of caverns destabilization. In the course, the calculation program trends to emanate and the deformation of wall rock also tends to rise suddenly and sharply also. The Laxiwa underground hydropower plant, a large cavern group in the northwest China, consists of main powerhouse, auxiliary powerhouse, main transformer chamber, caudal shiplock chamber, tailrace tunnels, and so on. The high geostress and interaction of caverns lead to very serious stability problem. Using the underground caverns strength reduction technique, the general safety factor of Laxiwa underground caverns is gained, which is 1.45. The assistant tunnels of Jinping II hydropower plant are important tunnels also. The general safety factor, calculated by the method, is 1.73. Both of them prove that the method of underground caverns strength reduction technique is very useful for analyzing the general stability of caverns and design of substructure quantitatively. |
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| Keywords: | rock mechanics underground caverns safety factor strength reduction theory stability analysis |
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