基于“天—空—地”协同观测的西宁市南川东路滑坡变形特征与稳定性分析

王志超; 赵健赟; 温兰冲; 高崇越; 姜传礼; 赵利江; 韩国财

doi:10.13961/j.cnki.stbctb.2024.02.024

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基于“天—空—地”协同观测的西宁市南川东路滑坡变形特征与稳定性分析

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- 基于“天—空—地”协同观测的西宁市南川东路滑坡变形特征与稳定性分析
- Deformation Characteristics and Stability Analysis of Nanchuan East Road Landslide in Xining City Based on Space-Air-Ground Observation Technology
- 水土保持通报 2024年44卷第2期页码：223-235
- 作者机构：
  
  1. 青海大学地质工程学院,青海,西宁,810016
  2. 青海省基础测绘院,青海,西宁,810001
  3. 青海省水利水电勘测设计研究院有限公司,青海,西宁,810000
- 作者简介：
- 基金信息：
  
  青海省重点研发与转化计划项目“青海省湟水流域潜在地质灾害风险识别与监测预警关键技术研究与应用”(2023-SF-122)
- DOI：10.13961/j.cnki.stbctb.2024.02.024
  中图分类号： P642.22
- 纸质出版：2024
- 稿件说明：
移动端阅览
王志超, 赵健赟, 温兰冲, 等. 基于“天—空—地”协同观测的西宁市南川东路滑坡变形特征与稳定性分析[J]. 水土保持通报, 2024,44(2):223-235.

Wang Zhichao, ZhaoJianyun, Wen Lanchong, et al. Deformation Characteristics and Stability Analysis of Nanchuan East Road Landslide in Xining City Based on Space-Air-Ground Observation Technology[J]. Bulletin of Soiland Water Conservation, 2024, 44(2): 223-235.
王志超, 赵健赟, 温兰冲, 等. 基于“天—空—地”协同观测的西宁市南川东路滑坡变形特征与稳定性分析[J]. 水土保持通报, 2024,44(2):223-235. DOI： 10.13961/j.cnki.stbctb.2024.02.024.

Wang Zhichao, ZhaoJianyun, Wen Lanchong, et al. Deformation Characteristics and Stability Analysis of Nanchuan East Road Landslide in Xining City Based on Space-Air-Ground Observation Technology[J]. Bulletin of Soiland Water Conservation, 2024, 44(2): 223-235. DOI： 10.13961/j.cnki.stbctb.2024.02.024.

摘要

[目的] 明确降雨对西宁市浅层滑坡失稳的影响，为该市降雨型浅层滑坡灾害的监测预警防治提供依据。 [方法] 以青海省西宁市南川东路H7滑坡为例，采用“天—空—地”协同观测技术对滑坡体进行观测调查，基于流固耦合原理和非饱和土强度理论进行水力耦合数值模拟，得出降雨作用下斜坡的孔隙水压力、应力、位移演化及塑性区分布，通过强度折减法计算不同降雨时长下斜坡安全系数。 [结果] ①南川东路H7滑坡整体形态呈长条状，为“牵引—推移”式滑坡，运动模式表现为坡脚失稳牵引、中部变形滑移及顶部失稳推移。 ②雨水入渗引发斜坡土体饱和度上升、基质吸力消散、有效应力降低、抗剪强度衰弱，导致斜坡的下滑力增大、抗滑力减小，诱使南川东路滑坡稳定性持续下降。 ③ 模拟降雨72 h后，在浅层土体内形成接近贯穿的圆弧形塑性滑动面，斜坡的安全系数从1.17降至1.01，处于“暂时稳定—变形”的欠稳定状态。水平位移在坡脚处最大，为6.89 cm；竖向位移在坡体上部最大，为5.98 cm。 [结论] ①“天—空—地”协同观测技术可有效支撑滑坡灾害的调查与评估，有限元水力耦合数值模拟对降雨型滑坡稳定性研究适用性强、效果较好。 ②南川东路H7滑坡在高强度持续降雨下稳定性将进一步降低，威胁道路、建筑及居民安全，需重视潜在滑坡风险。

Abstract

[Objective] The influence of rainfall on the instability of shallow landslides was determied in Xining City in order to provide a basis for the monitoring

early warning and prevention of rainfall-type shallow landslide disasters in Xining City. [Methods] The H7 landslide of Nanchuan East Road in Xining City

Qinghai Province was observed and investigated by using space-air-ground observation technology. Based on the fluid-solid coupling principle and unsaturated soil strength theory

hydraulic coupling numerical simulation was carried out to obtain the evolution of porewater pressure

stress

displacement

and plastic zone distribution of the slope under the action of rainfall. The intensity reduction method was used to calculate the slope safety factor under different rainfall durations. [Results] ① The overall landslide form of the H7 landslide on Nanchuan East Road was a long strip

which was a tractor-push landslide. The movement mode was manifested as unstable traction at the slope foot

deformation and sliding in the middle of the slope

and unstable pushing at the top of the slope. ② Rainwater infiltration caused soil saturation to rise

matric suction to dissipate

effective stress to decrease

and shear strength to weaken

resulting in the slope sliding force to increase and the anti-sliding force to decrease

thereby inducing the landslide stability of Nanchuan East Road to continue to decline. ③ After 72 h of simulated rainfall

a nearly penetrating arc-shaped plastic sliding surface was formed in the shallow soil

and the safety factor of the slope decreased from 1.17 to 1.01

indicating an unstable state of temporary stability-deformation. The maximum horizontal displacement was 6.89 cm at the foot of slope. The maximum vertical displacement was 5.98 cm in the upper part of the slope. [Conclusion] ① Space-air-ground observation technology can effectively support the investigation and evaluation of landslide disasters

and finite element hydraulic coupling numerical simulation has strong applicability and good effect for the study of the stability of rainfall-type landslides. ② The stability of the H7 landslide on Nanchuan East Road will be further reduced under high-intensity continuous rainfall

which will threaten the safety of roads

buildings and residents

therefore attention should be given to the potential landslide risk.

关键词

Keywords

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