Reactivation Characteristics and Mechanism of Engineering Disturbed Dumi Landslide in Western Sichuan Province, China

doi:10.19657/j.geoscience.1000-8527.2022.084

Abstract

Abstract:

Human engineering activities are an important factor that induce the reactivation and instable failure of landslides. In this study, taking the Dumi landslide in Yajiang County in Sichuan Province as an example, we summarize the deformation and failure characteristics and zoning evaluation, based on the Dumi landslide characteristics investigation by field investigation, Insar interpretation, engineering drilling, numerical analysis, and stability calculation. We analyzed the formation mechanism of the Dumi landslide reactivation, and the relationship between the stability coefficient FOS and excavation distance to the toe of the Dumi landslide. The results show three sliding surfaces, corresponding to strong, medium, and weak deformation areas. Slope toe excavation is the main trigger for the reactivation of the Dumi landslide, and a consequent deterioration in the shear strength of sliding zone soil caused by rainfall infiltration is the boosting factor. When the horizontal excavation distance at the slope toe is over 10.0 m, the sliding body would be clearly deformed and damaged under rainstorm conditions. Our results have good reference significance for avoiding small geological disasters in generating large losses, caused by landslides similar to that at Dumi.

Key words: engineering disturbance, landslide reactivation, stability analysis, formation mechanism

CLC Number:

P642.22

ZHOU Hongfu, FANG Tian, XIA Chenhao, RAN Tao, XU Ruge, ZHANG Jinghua. Reactivation Characteristics and Mechanism of Engineering Disturbed Dumi Landslide in Western Sichuan Province, China[J]. Geoscience, 2023, 37(04): 1044-1053.

Figures/Tables 11

References 14

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编号	裂缝性质	位置	平面走向(°)	延伸长度(m)	可见深度(m)	宽度(cm)	错距(m)
LF1	拉张裂缝	滑坡后缘	69	30.0	0.30~1.00	8.9~40.5	0.15~0.45
LF2	拉张裂缝	滑坡后缘	85	7.9	0.12~0.20	5.7~9.8	0.05~0.10
LF3	拉张裂缝	滑坡后缘	102	9.2	0.20~0.65	10.5~33.5	0.15~0.85
LF4	拉张裂缝	滑坡中部道路	80	14.3	0.12~0.38	9.5~22.2	0.05~0.10
LF5	拉张裂缝	滑坡中部道路	72	21.3	0.20~0.35	7.8~18.8	0.10~0.20
LF6	拉张裂缝	滑坡中部道路	81	28.6	0.15~0.30	5.9~25.2	0.15~1.00
LF7	拉张裂缝	滑坡中部道路	96	28.5	0.15~0.70	8.6~20.5	0.10~2.00
LF8	拉张裂缝	滑坡中部道路	79	23.3	0.15~0.40	5.1~9.4	0.05~0.10
LF9	拉张裂缝	滑坡下部斜坡缓坡平台	86	28.1	0.2~0.55	7.5~15.8	0.05~0.15
LF10	拉张裂缝	滑坡中部土路	48	12.5	0.12~0.49	4.2~15.2	0.10~0.20
LF11	拉张裂缝	滑坡中部斜坡	83	25.1	0.15~0.60	7.1~20.2	0.15~0.55
LF12	剪张裂缝	滑坡下部左边界剪切裂缝	25	7.0	0.10~0.30	3.8~10.4	0.05~0.10
LF13	拉张裂缝	滑坡下部斜坡缓坡平台	101	7.4	0.15~0.40	5.6~12.2	0.10~0.30
LF14	拉张裂缝	滑坡下部斜坡缓坡平台	158	8.2	0.12~0.45	4.0~12.0	0.10~0.22
LF15	拉张裂缝	滑坡中部斜坡	122	15.1	0.10~0.40	4.5~10.2	0.10~0.20
LF16	拉张裂缝	滑坡前缘省道外侧缓坡平台	77	17.2	0.10~0.40	4.0~13.5	0.10~0.28

编号	裂缝性质	位置	平面走向(°)	延伸长度(m)	可见深度(m)	宽度(cm)	错距(m)
LF1	拉张裂缝	滑坡后缘	69	30.0	0.30~1.00	8.9~40.5	0.15~0.45
LF2	拉张裂缝	滑坡后缘	85	7.9	0.12~0.20	5.7~9.8	0.05~0.10
LF3	拉张裂缝	滑坡后缘	102	9.2	0.20~0.65	10.5~33.5	0.15~0.85
LF4	拉张裂缝	滑坡中部道路	80	14.3	0.12~0.38	9.5~22.2	0.05~0.10
LF5	拉张裂缝	滑坡中部道路	72	21.3	0.20~0.35	7.8~18.8	0.10~0.20
LF6	拉张裂缝	滑坡中部道路	81	28.6	0.15~0.30	5.9~25.2	0.15~1.00
LF7	拉张裂缝	滑坡中部道路	96	28.5	0.15~0.70	8.6~20.5	0.10~2.00
LF8	拉张裂缝	滑坡中部道路	79	23.3	0.15~0.40	5.1~9.4	0.05~0.10
LF9	拉张裂缝	滑坡下部斜坡缓坡平台	86	28.1	0.2~0.55	7.5~15.8	0.05~0.15
LF10	拉张裂缝	滑坡中部土路	48	12.5	0.12~0.49	4.2~15.2	0.10~0.20
LF11	拉张裂缝	滑坡中部斜坡	83	25.1	0.15~0.60	7.1~20.2	0.15~0.55
LF12	剪张裂缝	滑坡下部左边界剪切裂缝	25	7.0	0.10~0.30	3.8~10.4	0.05~0.10
LF13	拉张裂缝	滑坡下部斜坡缓坡平台	101	7.4	0.15~0.40	5.6~12.2	0.10~0.30
LF14	拉张裂缝	滑坡下部斜坡缓坡平台	158	8.2	0.12~0.45	4.0~12.0	0.10~0.22
LF15	拉张裂缝	滑坡中部斜坡	122	15.1	0.10~0.40	4.5~10.2	0.10~0.20
LF16	拉张裂缝	滑坡前缘省道外侧缓坡平台	77	17.2	0.10~0.40	4.0~13.5	0.10~0.28

材料名称	E(GPa)	γ(MN·m^-3)	C(MPa)	φ(°)	T(MPa)	μ
强风化岩体	3.0	0.026	0.60	43	0.1	0.30
弱风化岩体	12.0	0.027	1.50	50	0.5	0.23
滑坡体	0.2/0.2	0.02/0.0205	0.04/0.03	28/23	0/0	0.37/0.37
第四系碎块石土	0.5/0.5	0.02/0.0205	0.06/0.05	31/25	0/0	0.36/0.36

材料名称	E(GPa)	γ(MN·m^-3)	C(MPa)	φ(°)	T(MPa)	μ
强风化岩体	3.0	0.026	0.60	43	0.1	0.30
弱风化岩体	12.0	0.027	1.50	50	0.5	0.23
滑坡体	0.2/0.2	0.02/0.0205	0.04/0.03	28/23	0/0	0.37/0.37
第四系碎块石土	0.5/0.5	0.02/0.0205	0.06/0.05	31/25	0/0	0.36/0.36

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