| 基于离心机模型试验的甘肃江顶崖古滑坡复活机理研究 |
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| 引用本文： | 郭长宝,张永双,刘定涛,滑帅,任三绍,李雪,金继军.基于离心机模型试验的甘肃江顶崖古滑坡复活机理研究[J].工程地质学报(英文版),2022,30(1):164-176. |
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| 作者姓名： | 郭长宝 张永双 刘定涛 滑帅 任三绍 李雪 金继军 |
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| 作者单位： | ①.中国地质科学院地质力学研究所，北京 100081，中国 |
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| 基金项目： | 国家自然科学基金;自然资源部杰出青年科技人才项目;中国地质调查局项目 |
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| 摘 要： | 位于白龙江断裂带的甘肃舟曲江顶崖古滑坡规模巨大，受断裂活动、降雨入渗与河流侵蚀和人类工程活动等因素影响，多次发生复活-堵塞白龙江灾害事件，造成极大危害。为研究江顶崖古滑坡的复活机理，本文在野外地质调查的基础上，重点开展了滑体在含水率为10%、15%和20%条件下的离心机模型试验。研究表明:在滑体含水率为10%情况下，试验结束后仅在坡体中后部产生少量裂缝，但滑坡体整体还处于稳定状态; 而在滑体含水率为15%和20%情况下，滑坡均发生了破坏，在滑体含水率分别为15%、20%情况下坡体失稳所需离心加速度分别为100g和50g。试验测试分析表明，江顶崖古滑坡为推移式滑坡，其变形先从坡体中后部开始，坡体中后部产生裂缝，随后裂缝逐渐向前缘扩展，最终裂缝贯通造成滑坡滑动破坏。滑坡体的变形过程主要分为3个阶段: ①变形启动阶段(裂缝开始形成阶段); ②变形加速阶段(裂缝加速发展阶段); ③失稳阶段。通过离心模拟试验，结合野外调查分析，认为江顶崖古滑坡复活的因素主要受降雨和孔隙水压力的影响，是受前缘河流侵蚀牵引、降雨入渗造成滑坡中后部推移的耦合滑动。
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| 关 键 词： | 江顶崖 古滑坡 滑坡启滑 离心机模型试验 复活机理 |
| 收稿时间： | 2021-10-25 |
CENTRIFUGE MODEL TEST OF REACTIVATION MECHANISM OF JIANG-DINGYA ANCIENT LANDSLIDE IN GANSU PROVINCE |
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| GUO Changbao,ZHANG Yongshuang,LIU Dingtao,HUA Shuai,REN Sanshao,LI Xue,JIN Jijun.CENTRIFUGE MODEL TEST OF REACTIVATION MECHANISM OF JIANG-DINGYA ANCIENT LANDSLIDE IN GANSU PROVINCE[J].Journal of Engineering Geology,2022,30(1):164-176. |
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| Authors: | GUO Changbao ZHANG Yongshuang LIU Dingtao HUA Shuai REN Sanshao LI Xue JIN Jijun |
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| Institution: | ①.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China②.Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing 100081, China③.Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geosciences, Shijiazhuang 050061, China④.North China Institute of Science and Technology, Langfang 065201, China |
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| Abstract: | The Jiangdingya ancient landslide is a huge scale landslide located in the Bailong River fault zone, in Zhouqu County, Gansu Province. Affected by fault activities, rainfall, river erosion, and human engineering activities, it has repeatedly revived and blocked the Bailong River, causing great disasters. In order to study the resurrection mechanism of Jiangdingya ancient landslide, based on the field geological survey, we focus on the centrifuge model test under the conditions of 10%, 15% and 20% water content. The test shows that when the water content is 10%,only a few cracks are generated in the middle and rear part of the slope, but the landslide is still in a stable state as a whole. In the case of 15% and 20% water content, the landslide body is damaged. When the water content is 15% and 20%,the centrifugal acceleration required for the slope instability is 100 g and 50 g respectively. The test analysis shows that the Jiangdingya ancient landslide is a thrust-type landslide. Its deformation starts from the middle and rear part of the slope, where cracks are generated. Then the cracks gradually expand to the front edge and finally penetrate and cause the landslide damage. The deformation process of the landslide body is mainly divided into three stages:(1)deformation initiation stage(crack formation stage);(2)deformation acceleration stage(crack acceleration development stage);(3)instability stage. The centrifugal simulation test and field investigation and analysis show that the factors for the resurrection of the Jiangdingya ancient landslide are mainly affected by rainfall and pore water pressure. It is a coupling sliding caused by the erosion of the front river and the movement of the middle and rear parts of the landslide caused by rainfall. |
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| Keywords: | Jiangdingya Ancient landslide Landslide starting Centrifuge model test Reactivation mechanism |
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