| 冯文凯,易小宇,孟睿,肖锐铧,苏永超,朱权威.三峡库区木鱼包滑坡不同库水升降速率变形响应离心模型试验研究[J].水利学报,2021,52(5):578-588 |
| 三峡库区木鱼包滑坡不同库水升降速率变形响应离心模型试验研究 |
| Study on deformation response of Muyubao landslide in Three Gorges region under different water fluctuation rates by centrifugal model test |
| 投稿时间：2020-07-23 |
| DOI：10.13243/j.cnki.slxb.20200557 |
| 中文关键词: 三峡库区 木鱼包滑坡 库水升降速率 变形响应 |
| 英文关键词: Three Gorges reservoir area Muyubao landslide reservoir water fluctuation rates deformation response |
| 基金项目:国家自然科学基金项目（41977252）；三峡后续工作地质灾害防治科学研究项目（0001212018CC60020）；地质灾害防治与地质环境保护国家重点实验室自主探索课题（SKLGP2020Z001） |
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| 中文摘要: |
| 本文采用地表位移监测和离心机模型试验研究了木鱼包滑坡在不同库水升降速率条件下的变形响应规律，取得以下认识：（1）木鱼包滑坡在重力和库水等因素作用下，促滑段不断挤压抗滑段而发生推移式蠕滑变形。（2）木鱼包滑坡变形主要受库水位高程和升降速率影响，降雨对滑坡的变形影响有限。165~175 m水位时，较高的库水上升速率才能造成月累计位移量大于30 mm的滑坡变形事件，而较低的库水下降速率则能造成大量月累计位移量大于30 mm的滑坡变形事件。145~165 m水位时，滑坡对库水升降速率的变形响应降低，滑坡月累计变形量基本处于30 mm以下。（3）滑坡的变形与库水浮力和动水压力有关。库水升降速率较小时，坡体内外水头差很小，库水浮力控制滑坡的变形；在库水升降速率提升后，坡体内外水头差增大导致动水压力增强，促使滑坡在库水抬升阶段的变形减弱，而在库水下降阶段的变形得到加强。（4）木鱼包滑坡的变形响应表现出自调节自适应性，首次蓄水对滑坡稳定性影响最为显著，后续的周期性库水升降过程中，对库水变动响应的敏感性有所减弱。以上研究结果可为三峡库区滑坡防治和库水调度优化提供有益借鉴。 |
| 英文摘要: |
| Surface displacement monitoring and centrifuge model test are used to study the deformation response law of Muyubao landslide under different rates of reservoir water lifting and falling. The following understandings are obtained：（1） Under the action of gravity and reservoir water in the Muyubao landslide， the driving section continuously compresses the locking section， resulting in the push type creep deformation. （2） The deformation of the Muyubao landslide is mainly affected by reservoir water level elevation and fluctuation rate，while the influence of rainfall on landslide deformation is limited. When the water level is 165-175m，the higher rising rate of reservoir water can cause landslide deformation events with monthly cumulative displacement greater than 30mm. In comparison， the lower reservoir water lowering rate can cause a large number of landslide deformation events with monthly cumulative displacement greater than 30mm. When the water level is 145-165m，the landslide's deformation response to the rise and fall rate of reservoir water decreases， and the accumulated monthly deformation of the landslide is less than 30mm. （3） The deformation of the landslide is related to reservoir water buoyancy and hydrodynamic pressure. When the rise and fall rate of reservoir water is low，the water head difference between inside and outside the slope is minimal. The reservoir water buoyancy controls the deformation of the landslide. After the rise and fall rate of reservoir water，the increase of water head difference between inside and outside the slope leads to the enhancement of hydrodynamic pressure， which makes the deformation of landslide weaken in the stage of reservoir water lifting. The deformation in the descending phase of reservoir water is strengthened. （4） The deformation response of the Muyubao landslide is self-adaptive， and the first impoundment has the most significant effect on the landslide's stability. The landslide's sensitivity to the reservoir water fluctuation response is weakened in the subsequent periodic reservoir water rise and fall process. The above research results can provide a useful reference for landslide control and reservoir water dispatching optimization in the Three Gorges Reservoir area. |
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