猴子岩水电站地下厂房洞室群施工期围岩变形与破坏特征

发布时间：2018-07-06 12:57

本文选题：地下工程 + 地下厂房洞室群　；参考：《岩石力学与工程学报》2014年11期

【摘要】：猴子岩水电站地下厂房洞室群具有高地应力、低强度应力比的特点,在施工过程中出现严重的变形破坏现象。结合地质、监测、检测及施工资料对施工期围岩的变形与破坏特征进行分析,分析结果表明:主厂房、主变室及尾调室围岩位移大于50 mm的测点分别占17.2%,27.3%和9.4%,三大洞室围岩变形处于较大水平,远超其他电站同期水平。最大位移出现在III1类围岩处,表明高地应力条件下,较完整硬岩产生的卸荷回弹变形较大,岩石本身破坏产生的变形所占比重增加。围岩变形深度为5~15 m,最大可达23 m,相对较大;围岩变形与开挖卸荷关系密切,呈"阶跃式"发展。围岩变形破坏以应力重分布起主导作用的应力驱动型为主,由结构面不利组合控制的重力驱动型不再占主导地位。研究猴子岩地下厂房洞室群围岩变形破坏机制对其施工及运营安全具有重要的工程意义。
[Abstract]:The cavern group of underground powerhouse of Monaoyan Hydropower Station is characterized by high in-situ stress and low strength stress ratio, which leads to serious deformation and failure during construction. Combined with geological, monitoring, detection and construction data, the deformation and failure characteristics of surrounding rock during construction period are analyzed. The results show that: main workshop, The displacement of surrounding rock in the main transformer chamber and the tail chamber is greater than 50 mm, accounting for 27.3% and 9.4%, respectively. The surrounding rock deformation of the three caverns is at a relatively high level, which is far higher than the corresponding level of other power stations. The maximum displacement occurs in the surrounding rock of III1, which indicates that under the condition of high in-situ stress, the unloading springback deformation caused by the intact hard rock is larger, and the proportion of the deformation caused by the failure of the rock itself is increased. The deformation depth of surrounding rock is 5 ~ 15 m, and the maximum is 23 m, which is relatively large, and the deformation of surrounding rock is closely related to excavating and unloading, and it develops in a "step" style. The deformation and failure of surrounding rock is dominated by stress-driven type which plays a leading role in stress redistribution, but the gravity driving type controlled by unfavorable combination of structural plane is no longer dominant. It is of great engineering significance to study the surrounding rock deformation and failure mechanism of the cavern group of monkey rock underground powerhouse for its construction and operation safety.
【作者单位】：中国地质大学岩土钻掘与防护教育部工程研究中心;昆明理工大学电力工程学院;中国电建集团成都勘测设计研究院有限公司;
【基金】：中国电建集团公司科研项目(P099) 国家自然科学基金资助项目(41472263)
【分类号】：TV223;TV731.6

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