Control Mechanism and Early Warning of Rainfall- Induced Landslide Based on NPR Anchor Cable

doi:10.12068/j.issn.1005-3026.2024.04.015

Abstract

Abstract:

In order to study the control and the early?warning prediction technology for rainfall?induced landslide， the similar model test was designed by analyzing the spatial and temporal characteristics of slope deformation of Xiongjia Mountain landslide. Using ordinary Poisson’s ratio （PR） anchor cable and negative Poisson’s ratio （NPR） anchor cable as reinforcement materials， the law of rainfall?induced landslide and control mechanism of anchor cable were analyzed by using high?speed photography， pore pressure， earth pressure and anchor cable force sensors， and the evolution law of the Newtonian force during landslide was explored based on field tests. The results show that the sudden drop in pore water pressure is approximately synchronized with the local collapse of slope. NPR anchor force drop abruptly， causing local deformation in slope. The PR anchor cables fail because they cannot withstand large deformation， while the NPR anchor cables have high?stress energy absorption control functions due to the constant resistance and large deformation characteristics， enabling the slope to reach a secondary equilibrium state. The NPR anchor cable exhibits a significant deformation?slip dynamic law characterized by a first sudden increase followed by a sudden drop before the landslide. The field test revealed the Newtonian force evolution law in the whole process of the landslide， and obtained the early?warning time parameters of the Xiongjia Mountain landslide 7.5 h in advance.

Key words: landslide, rainfall, negative Poisson’s ratio （NPR） anchor cable, control mechanism, monitoring and early?warning

CLC Number:

P 694

Zhi-gang TAO, Guang-cheng SHI, Xiao-jie YANG, Man-chao HE. Control Mechanism and Early Warning of Rainfall- Induced Landslide Based on NPR Anchor Cable[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 573-583.

Figures/Tables 25

References 14

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材料类型	容重/（kN·m^-3）		单轴抗压强度/MPa		黏聚力/kPa		摩擦角/(°)		泊松比	弹性模量
材料类型	天然	饱和	天然	饱和	天然	饱和	天然	饱和	泊松比	GPa
滑体	21.3	22.6	1.1	0.8	5.4	2.5	33.1	26.5	0.35	2.2
滑床	24.9	25.4	80.7	60.3	493.4	451.3	35.6	33.8	0.29	25.5
基岩	26.2	26.4	109.1	103.9	3 126.9	3 045.5	36.8	35.4	0.27	35.4

材料类型	容重/（kN·m^-3）		单轴抗压强度/MPa		黏聚力/kPa		摩擦角/(°)		泊松比	弹性模量
材料类型	天然	饱和	天然	饱和	天然	饱和	天然	饱和	泊松比	GPa
滑体	21.3	22.6	1.1	0.8	5.4	2.5	33.1	26.5	0.35	2.2
滑床	24.9	25.4	80.7	60.3	493.4	451.3	35.6	33.8	0.29	25.5
基岩	26.2	26.4	109.1	103.9	3 126.9	3 045.5	36.8	35.4	0.27	35.4

材料类型	容重/（kN·m^-3）		单轴抗压强度/MPa		黏聚力/kPa		摩擦角/(°)		泊松比	弹性模量
材料类型	天然	饱和	天然	饱和	天然	饱和	天然	饱和	泊松比	MPa
滑体	19.6	21.3	0.03	0.01	0.06	0.03	26.7	20.3	0.38	17
滑床	22.4	23.5	0.92	0.71	4.5	3.9	30.3	28.5	0.26	246
基岩	25.9	26.2	1.05	0.93	30.2	27.6	34.1	30.4	0.23	341

材料类型	容重/（kN·m^-3）		单轴抗压强度/MPa		黏聚力/kPa		摩擦角/(°)		泊松比	弹性模量
材料类型	天然	饱和	天然	饱和	天然	饱和	天然	饱和	泊松比	MPa
滑体	19.6	21.3	0.03	0.01	0.06	0.03	26.7	20.3	0.38	17
滑床	22.4	23.5	0.92	0.71	4.5	3.9	30.3	28.5	0.26	246
基岩	25.9	26.2	1.05	0.93	30.2	27.6	34.1	30.4	0.23	341

阶段	降雨时间	静置时间
Ⅰ-1	60	76
Ⅰ-2	60	60