| 白莲洞遗址危岩体形成机理及破坏模式 |
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| 引用本文： | 苏文俊,王金海,付敏,吴锐.白莲洞遗址危岩体形成机理及破坏模式[J].煤田地质与勘探,2016,44(2):59. |
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| 作者姓名： | 苏文俊 王金海 付敏 吴锐 |
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| 摘 要： | 以广西柳州白莲洞遗址崖体为研究对象，经地质调查发现，白莲洞遗址崖体存在共计47处不稳定岩体，崖体岩性主要为厚层灰岩，岩溶发育且该厚层灰岩岩体节理裂隙十分发育，存在着诸多危岩体。通过野外地质调查与室内理论分析表明:白莲洞遗址崖体陡峭，灰岩厚层，层理面、构造裂隙、岩溶裂隙和卸荷裂隙发育，在持续暴雨、地震的强有力触发下导致山体松弛，变形加剧，形成了以柱状、楔形体状、块状为主的特大型危岩体，且多处于高位-特高位，从而表现出倾倒、滑移和少量坠落及其复合型的多种破坏模式；其变形破坏绝非突发，厚层块状构造、岩溶发育、坚硬灰岩夹白云岩透镜体及发育的节理裂隙是其形成的主要先天基础因素；降水的渗入、岩溶裂隙水的溶蚀及强烈的根劈作用为其主要触发因素。
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| 关 键 词： | 危岩体 形成机理 影响因素 破坏模式 地质模型 |
| 收稿时间： | 2015-04-20 |
Formation mechanism and failure mode of perilous rocks in Bailiandong site |
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| Abstract: | Bailiandong site cliff in Liuzhou, Guangxi was taken as research objective, the geological investigation found totally 47 unstable rock masses. The lithology of cliff body is mainly the thick limestone with developed joint and karst. There are many dangerous perilous rocks. Study shows that Bailiandong site has steep cliff body, thick limestone layer, developed bedding plane, tectonic fissures, karst fissure and unloading fissure. Continuous rainstorm and earthquake have triggered the flabby perilous rocks and deformation, formed many oversize dangerous perilous rocks mainly with shape of column, wedge and mass in high-very high position, thus showing up multiple compound failure modes such as dumping, sliping It can develop into the dumping, slip and small amounts of fall. Its deformation and failure are absolutely not abrupt, the massive structure of thick layer, karst development, hard limestone with dolomite lenses and developed joints fissures are the congenital basic factors, and rainfall infiltration, dissolution and strong root wedging of karst fissure water are main triggering factors. |
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