Reactivation mechanism of old landslide triggered by coupling of fault creep and water infiltration: a case study from the east Tibetan Plateau

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2023-07-04 DOI:10.1007/s10064-023-03290-5

Yongshuang Zhang, Sanshao Ren, Xiaoyi Liu, Changbao Guo, Jinqiu Li, Junbo Bi, Lina Ran

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引用次数: 2

Abstract

The platforms of old landslides triggered by historical earthquakes have often been important residential and agricultural places in active tectonic regions. In recent years, many old landslides have been reactivated due to various causes. Previous studies have shown that the hydrodynamic effect is an important triggering factor for landslide reactivation. However, as an old landslide has undergone a long consolidation period, the permeability of deposits is generally very low, and surface water can hardly infiltrate into deep zones of landslide deposits. Through field investigation, it is found that many old landslides are reactivated due to the coupled action of water infiltration and cracks in the east Tibetan Plateau. The cracks are controlled by fault creep in the initial formation process. In this paper, taking the Chashushan old landslide in the upstream of Jinsha River as a case study, field investigation, experimental study, numerical simulation, and PS-InSAR technique are performed to investigate the reactivation mechanism of the old landslide. The influences of cracks, rainfall, and canal leakage on old landslide reactivation are discussed. The cracks controlled by fault creep provide channels or media for the rapid infiltration of surface water, which is the triggering factor of landslide reactivation. The results in this paper can provide an important reference for research on the reactivation mechanism and risk control of old landslides in the east Tibetan Plateau and even in active tectonic areas around the world.

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断层蠕变与水入渗耦合诱发老滑坡的再活化机制——以青藏高原东部为例

摘要历史地震诱发的老滑坡台地往往是构造活跃区重要的居住和农业场所。近年来，许多旧的山泥倾泻因各种原因而重新活化。前人的研究表明，水动力效应是滑坡再激活的重要触发因素。然而，由于老滑坡经历了较长的固结期，沉积物的渗透性一般很低，地表水很难渗透到滑坡沉积物的深层。通过野外调查发现，青藏高原东部由于水入渗和裂缝的耦合作用，许多老滑坡被重新激活。裂缝形成初期受断层蠕变控制。本文以金沙江上游茶树山老滑坡为例，采用野外调查、试验研究、数值模拟、PS-InSAR技术等方法，探讨了老滑坡的活化机理。讨论了裂缝、降雨和渠道渗漏对老滑坡恢复的影响。受断层蠕变控制的裂缝为地表水的快速入渗提供了通道或介质，是滑坡再活化的触发因素。研究结果可为青藏高原东部乃至全球构造活动区老滑坡的活化机制研究和风险控制提供重要参考。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.