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具有挡土墙状锁固段滑坡的破坏机制研究及基于反速度法的失稳预测

Research on failure mechanism of landslide with retaining-wall-like locked segment and instability prediction by inverse velocity method.

作者信息

Chen Jia-Xing, Liu Han-Dong, Guo Zhi-Fei, Liu Jing-Jing, Feng Ling-Yun, Liu Shuai

机构信息

College of Architecture & Civil Engineering, Shangqiu Normal University, Shangqiu, 476000, China.

College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China.

出版信息

Sci Rep. 2024 Sep 12;14(1):21359. doi: 10.1038/s41598-024-72154-z.

DOI:10.1038/s41598-024-72154-z
PMID:39266643
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11393356/
Abstract

The locked segment is critical for determining the stability of locked segment-type landslides. Research indicates that the volume expansion point marks the transition from the secondary creep stage to the tertiary creep stage in a landslide's evolution, and also separates the stable crack growth stage from the unstable crack growth stage in the locked segment. Identifying the volume expansion point is essential for early warning and predicting locked segment-type landslides. A series of instruments (resistance strain gauges, acoustic emission system, piezoelectric acceleration sensors, etc.) were used to conduct physical model tests of the landslide with retaining-wall-like locked segment under external load on the landslide's trailing edge. The evolution process of this landslide was analyzed through changes in slope shape and stress response characteristics. The experimental results reveal the failure mechanism of the landslide with retaining-wall-like locked segment: the upper part of the landslide thrusts and slides, the middle part squeezes and uplifts, the retaining-wall-like locked segment produces a locking effect, and compression-shear fracture of the retaining-wall-like locked segment leads to landslide failure. Based on the deformation and acoustic emission characteristics of the locked segment, a method for identifying the volume expansion point was established. This point was used as the onset of acceleration point in the inverse velocity method to predict the failure time of the locked segment-type landslides, incorporating the three-stage creep model and Fukumoto's theory.

摘要

锁固段对于确定锁固段型滑坡的稳定性至关重要。研究表明，体积膨胀点标志着滑坡演化过程中从次蠕变阶段向第三蠕变阶段的转变，同时也将锁固段中稳定裂纹扩展阶段与非稳定裂纹扩展阶段区分开来。识别体积膨胀点对于锁固段型滑坡的早期预警和预测至关重要。使用了一系列仪器（电阻应变片、声发射系统、压电加速度传感器等）对具有挡土墙状锁固段的滑坡在滑坡后缘外部荷载作用下进行物理模型试验。通过边坡形状和应力响应特征的变化分析了该滑坡的演化过程。试验结果揭示了具有挡土墙状锁固段滑坡体的破坏机制：滑坡上部推滑、中部挤压隆起、挡土墙状锁固段产生锁固效应，挡土墙状锁固段的压剪断裂导致滑坡失稳。基于锁固段的变形和声发射特征，建立了一种识别体积膨胀点的方法。该点被用作反速度法中的加速起始点，结合三阶段蠕变模型和福本理论来预测锁固段型滑坡的破坏时间。

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本文引用的文献

1
Experimental study on tilting deformation and a new method for landslide prediction with retaining-wall locked segment.挡墙锁固段的倾斜变形试验研究与滑坡预测新方法
Sci Rep. 2023 Mar 29;13(1):5149. doi: 10.1038/s41598-023-32477-9.