| 京广铁路路基覆盖型岩溶塌陷整治关键技术 |
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| 引用本文： | 肖旺.京广铁路路基覆盖型岩溶塌陷整治关键技术[J].路基工程,2021,0(6):210-214. |
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| 作者姓名： | 肖旺 |
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| 作者单位： | 广东省铁路规划设计研究院有限公司，广州 510600 |
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| 摘 要： | 以京广铁路乐昌段K1994+780~K1995+020段路基基底覆盖型岩溶塌陷引发路基沉降为例，分析覆盖型岩溶的形成原因及发育机理；采用“探灌结合”的方式进行岩溶塌陷治理，采取钻孔取芯法和钻孔降水头注水试验法验证注浆效果。研究结果表明:采用压力返浆充填的注浆方案充填了岩溶溶腔、溶蚀土洞及裂隙，降低了路基地层的渗透性，封闭了地下水潜蚀作用。
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| 关 键 词： | 覆盖型岩溶 铁路路基 土洞 岩溶注浆 岩溶裂隙 探灌结合 注水试验 |
| 收稿时间： | 2021-02-01 |
Key Technology for Control of the Subgrade Covered Karst Collapse of Beijing—Guangzhou Railway |
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| Abstract: | Taking the subgrade settlement caused by such karst collapse at the K1994+780~K1995+020 of the Lechang section in Beijing—Guangzhou Railway as an example, the formation reason and development mechanism of covered karst fissures were analyzed. The collapse was treated by means of the combination of exploration and irrigation, and then the grouting effect was verified by core-drilling test and falling head water injection test in borehole. The result of the research shows that, in the grouting scheme of pressure filling by mud return, the karst cavity, eroded soil cave and fissures are filled so as to reduce the permeability of subgrade layers and block up the potential erosion of underground water. |
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