Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area

ZHANG Fu-ling; DENG Mao-lin; ZHOU Jian; LI Zhuo-jun; LIN Yan

doi:10.11988/ckyyb.20191255

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Journal of Changjiang River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (1) : 78-83. DOI: 10.11988/ckyyb.20191255

ENGINEERING SAFETY AND DISASTER PREVENTION

Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area

ZHANG Fu-ling^1,2,3, DENG Mao-lin^1,2,3, ZHOU Jian^1,2,3, LI Zhuo-jun^1,2,3, LIN Yan^1,2,3

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Abstract

Since the implementation of professional monitoring in 2006, the Tanjiawan landslide in the Three Gorges reservoir area has seen a continuously increasing displacement. Especially since 2015, the deformation trend has intensified, posing a great threat to the lives and property safety of villagers in the reservoir area. According to long-term field geological survey, macroscopic inspection, automatic monitoring data of landslide surface crack displacement and artificial GPS monitoring data for over 12 years, we examined the basic deformation characteristics and deformation mechanism of the landslide under heavy rainfall and reservoir water level fluctuation. Results suggest that the Tanjiawan landslide is a rainfall-triggered retrogressive landslide with medium-thick layer chair-shaped groove shape. Heavy rainfall and continuous rainfall are major external factors affecting landslide deformation, while water level fluctuation has little effect. Heavy rainfall and continuous rainfall led to evident response: when daily rainfall exceeds 90 mm or the accumulated rainfall of previous three days reaches 50 mm while rainfall on the same day and the previous day exceeds 15 mm, the surface crack width-time curve and the cumulative displacement-time curve will witness an apparent step upward. At present, the deformation of Tanjiawan landslide is increasing year by year, with boundary cracks basically formed. It is highly probable that sliding will occur under extreme conditions such as heavy rainfall. Automatic monitoring equipment and detail inspection must be strengthened.

Key words

rainfall-induced landslide / deformation characteristics / step curve / landslide formation mechanism / Tanjiawan landslide

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ZHANG Fu-ling, DENG Mao-lin, ZHOU Jian, LI Zhuo-jun, LIN Yan. Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area[J]. Journal of Changjiang River Scientific Research Institute. 2021, 38(1): 78-83 https://doi.org/10.11988/ckyyb.20191255

References

[1] 卢书强, 易庆林, 易武, 等. 三峡库区树坪滑坡变形失稳机制分析[J]. 岩土力学, 2014, 35(4): 1123-1130, 1202.
[2] 邓茂林, 易庆林, 韩蓓, 等. 长江三峡库区木鱼包滑坡地表变形规律分析[J]. 岩土力学, 2019,40(8): 3145-3152,3166.
[3] 周剑,邓茂林,李卓骏,张富灵.三峡库区浮托减重型滑坡对库水升降的响应规律[J].水文地质工程地质,2019,46(5):136-143.
[4] 肖诗荣, 卢树胜, 管宏飞, 等. 三峡库区凉水井滑坡地质力学模型研究[J]. 岩土力学, 2013, 34(12): 3534-3542.
[5] 卢书强, 易庆林, 易武, 等. 库水下降作用下滑坡动态变形机制分析: 以三峡库区白水河滑坡为例[J]. 工程地质学报, 2014, 22(5): 869-875.
[6] 贺可强, 王荣鲁, 李新志, 等. 堆积层滑坡的地下水加卸载动力作用规律及其位移动力学预测:以三峡库区八字门滑坡分析为例[J]. 岩石力学与工程学报, 2008, 27(8): 1644-1651.
[7] 许强, 汤明高, 徐开祥,等. 滑坡时空演化规律及预警预报研究[J]. 岩石力学与工程学报, 2008, 27(6):1104-1104.
[8] HUANG D, GU D M, SONG Y X, et al. Towards a Complete Understanding of the Triggering Mechanism of a Large Reactivated Landslide in the Three Gorges Reservoir[J]. Engineering Geology, 2018, 238: 36-51.
[9] 林鸿州, 于玉贞, 李广信,等. 降雨特性对土质边坡失稳的影响[J]. 岩石力学与工程学报, 2009, 28(1):198-204.
[10] 地质矿产部编写组.长江三峡工程库岸稳定性研究[M].北京 :地质出版社,1988.
[11]殷坤龙,汪洋,唐仲华.降雨对滑坡的作用机理及动态模拟研究[J]. 地质科技情报,2002,21(1):75-78.
[12]许强. 滑坡的变形破坏行为与内在机理[J]. 工程地质学报, 2012, 20(2):145-151.
[13]陈洪凯, 魏来, 谭玲. 降雨型滑坡经验性降雨阈值研究综述[J]. 重庆交通大学学报(自然科学版), 2012, 31(5):990-996.
[14]LUMB. Effect of Rainstorm on Slope Stability [M]. Hong Kong: Local Property & Printing Company, 1962: 73-87.
[15]COROMINAS J. Landslides and climate[C]//Proceedings of the 8th International Symposium on Landslide. Cardiff: A. A. Balkema Publishers. June 26-30, 2000: 125-132.
[16]PASUTO A,SILVANO S.Rainfall as a Triggering Factor of Shallow Mass Movement:A Case Study in the Dolomites,Italy[J]. Environmental Geology,2000,35(2/3):84-189.
[17]李卓骏, 邓茂林, 周剑,等.靠椅状土质滑坡形成条件及时空演化特征[J].水土保持通报, 2019,39(3):65-69.
[18]邓茂林,周剑,易庆林,等.三峡库区靠椅状土质滑坡变形特征及机制分析[J].岩土工程学报,2020,42(7):1296-1303.
[19]黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J]. 岩石力学与工程学报, 2007, 26(3):433-454.
[20]黄润秋, 许强. 中国典型灾难性滑坡[J]. 工程地质学报, 2008,16(5):714-714.
[21]张倬元, 王士天, 王兰生,等. 工程地质分析原理[M]. 3版,北京:地质出版社,2009:367-380.
[22]常金源, 包含, 伍法权,等. 降雨条件下浅层滑坡稳定性探讨[J]. 岩土力学, 2015, 36(4):995-1001.