四川丹巴甲居滑坡动态变形过程三维系统监测及数值模拟分析

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摘要受青藏高原地质构造作用的影响，我国西南山区分布着大量成因类型多、机制复杂、突发性强、变形破坏发展趋势难以预测、失稳后破坏性大等特点的堆积体滑坡。甲居滑坡为大渡河上游一巨型松散堆积体古滑坡局部复活，针对滑坡动态变形过程和失稳破坏迹象，综合采用GPS地表位移监测、干涉InSAR监测和深部位移监测(测斜仪)，3种监测技术优势特点并相互结合构成三维系统监测网。根据监测成果分析，判别其当前为浅表层加速变形破坏和深部缓慢变形的演化阶段；研究其变形失稳模式为浅表层滑移–拉裂失稳破坏和深部蠕滑–拉裂变形的复合模式；并利用FLAC3D数值模拟滑坡在动态变形过程中滑坡体内的应力场、位移、塑性破坏区分布特征的变化。

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关键词 ：边坡工程, 堆积体滑坡, GPS, InSAR, 深部位移监测, FLAC3D

Abstract：Affected by Qinghai—Tibet Plateau tectonic structures，numerous accumulations slides which have the characteristics of multiple formation types，complex mechanism，sudden occurrence，difficult to predict the developing trend，huge damage，etc.，are distributed in Southwest China. Among of them，Jiaju landslide，which locates at the upper reach of Dadu River，is a typical ancient one with dramatically thick depth and localized resurrection tendency. A comprehensive monitoring system including GPS，InSAR and Inclinometer has been carried out to monitor both surface displacement and deep displacement. The result shows that Jiaju landslide nowadays is at an evolutionary stage with accelerating deformation in the surface and slow deformation in the deep body. And further analysis of the monitoring results indicates the deformation and failure modes are the combination of sliding and compression cracking in the surface and fracturing in the deep position. In order to testify the monitoring results，FLAC3D numerical simulation method is adopted and the stress field，distribution of displacement and plastic zone in the dynamic deformation process for Jiaju landslide are all simulated；and simulation results are consistent with monitoring results.

Key words： slope engineering accumulations slides global positioning system(GPS) interferometry synthetic aperture radar(InSAR) deep displacement monitoring fast lagrangian analysis of continua in 3-dimensions (FLAC3D)

收稿日期: 2010-12-29

引用本文:

白永健1，郑万模1，邓国仕1，倪化勇1，张清志1，贾俊2. 四川丹巴甲居滑坡动态变形过程三维系统监测及数值模拟分析[J]. 岩石力学与工程学报, 2011, 30(5): 974-981.
BAI Yongjian1，ZHENG Wanmo1，DENG Guoshi1，NI Huayong1，ZHANG Qingzhi1，JIA Jun2. THREE-DIMENSIONAL SYSTEM MONITORING AND NUMERICAL SIMULATION ON THE DYNAMIC DEFORMATION PROCESS OF JIAJU LANDSLIDE IN DANBA，SICHUAN. , 2011, 30(5): 974-981.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I5/974

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