| 基于多源数据的谭家湾滑坡变形机制及稳定性评价 |
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| 引用本文： | 仝德富,谭飞,苏爱军,宋洪斌,鲁志春,于锦.基于多源数据的谭家湾滑坡变形机制及稳定性评价[J].地质科技通报,2021,40(4):162-170. |
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| 作者姓名： | 仝德富 谭飞 苏爱军 宋洪斌 鲁志春 于锦 |
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| 基金项目： | 中国地质大学（武汉）中央高校基本科研业务专项资金资助项目CUG1910491T07 |
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| 摘 要： | 针对2016年5月发生于秭归县西北部的谭家湾滑坡，结合卫星遥感影像、现场勘查资料以及历史资料等多源数据，初步明确了滑坡的影响区域、特征及发生时序；综合采用钻探、槽探、物探等手段，开展室内外相关实验，明确了滑坡区的地层特性以及岩土体物理力学性质指标，通过分析该区裂缝位移及GPS数据，对该边坡的变形机制进行了探讨，并对该区稳定性进行了评价。结果表明:①谭家湾滑坡属于不规则"圈椅形"中型松散层的水库下降型滑坡，滑坡区的地表形态、地质构造及岩性等因素决定了滑坡的形成和发育，库水位和降雨的共同作用激励了滑坡的变形；②滑坡根据时序共分为3级滑体，总体呈现多次、多层、相互影响的演化特点，第三级滑体具有牵引式特征；③滑坡体内地下水位随库水位下降而下降，但下降速率缓于库水位，随之坡体内水力梯度和渗透力显著变大，此时碰到强降雨，将会导致坡体地下水赋存，岩土体软化，加剧滑坡变形，须施加必要的防护措施。④稳定性分析表明，该滑坡现处于临界稳定状态，一旦发生降雨和库水位变化，局部段可能发生失稳滑动。
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| 关 键 词： | 多源数据 水库下降型滑坡 变形特征 失稳机制 |
| 收稿时间： | 2020-12-09 |
Deformation mechanism and stability evaluation of Tanjiawan landslide based on multi-source data |
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| Abstract: | In view of the Tanjiawan landslide, which occurred in the northwest of Zigui County in May 2016, this paper preliminarily defined the affected area, characteristics and occurrence time sequence of the landslide based on multi-source data such as satellite remote sensing images, field survey data and historical data.By means of drilling, trough exploration and geophysical exploration, indoor and outdoor experiments were carried out to clarify the stratum characteristics and the physical and mechanical properties of the rock and soil mass in the landslide area.By analyzing the crack displacement and GPS data in the area, the deformation mechanism of the slope was discussed and the stability of the area was evaluated.The results show that: ①The Tanjiawan landslide belongs to reservoir descending landslide with irregular "chair-shaped" medium-sized loose layer; the surface morphology, geological structure and lithology of landslide area determine the formation and development of landslide, and the joint action of reservoir water level and precipitation stimulates the development of landslide; ②The landslide is divided into three levels of sliding body according to the time sequence, showing multiple, multi-layered and mutual shadows on the whole.The third-order sliding body has the characteristics of traction; ③The groundwater level in the landslide body decreases with the decrease of the reservoir level, but the rate of decline is slower than the reservoir level, and the hydraulic gradient and permeability in the slope body become significantly larger.Heavy rainfall at this time will lead to the occurrence of groundwater in the slope body, softening of rock and soil mass, and exacerbating landslide deformation, and necessary protective measures must be applied; ④Stability analysis shows that the landslide is in a critical stable state.Once rainfall and reservoir water level change, instability sliding may occur in some sections. |
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