隧洞开挖渗流场变化对滑坡稳定性的影响数值模拟分析

doi:10.3969/j.issn.1001-5485.2015.05.012

院报 ›› 2015, Vol. 32 ›› Issue (5): 61-65.DOI: 10.3969/j.issn.1001-5485.2015.05.012

隧洞开挖渗流场变化对滑坡稳定性的影响数值模拟分析

张凡^1,2,韩爱果¹,任光明¹,杜飞¹,吴龙科¹,詹可¹

1.成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都 610059;
2.四川省地质矿产勘查开发局四〇五地质队成都 611830

收稿日期:2014-04-28 出版日期:2015-05-01 发布日期:2015-05-14
作者简介:张凡(1990-),男,四川大竹人,硕士研究生,主要从事地质灾害评价与预测的研究工作,(电话)15208486290

Numerical Simulation on Landslide Stability Affected by Seepage FieldVariation Caused by Tunnel Excavation

ZHANG Fan^1,2, HAN Ai-guo¹, REN Guang-ming¹, DU Fei¹, WU Long-ke¹, ZHAN Ke¹

1.State Key Laboratory of Geohazard Prevention and Geoenviroment Protection, Chengdu University of Technology, Chengdu 610059, China;
2.Sichuan geology and mineral exploration and development bureau of four O five geological team, Chengdu 611830, China

Received:2014-04-28 Online:2015-05-01 Published:2015-05-14

摘要/Abstract

摘要： 为研究隧洞开挖对滑坡渗流场、坡体变形及稳定性的影响,在对某滑坡滑体物理力学及水理性质进行研究的基础上,采用Modflow有限元差分三维软件对隧洞开挖前后的地下水位进行数值模拟计算,分析隧洞开挖后渗流场的变化,并以此结合Geo-Studio软件对滑坡处于天然及开挖情况下水位变化后的稳定性及变形进行了分析研究。结果表明:隧洞开挖后地下水渗流场发生改变,隧洞开挖处产生明显涌水现象,开挖2 a后地下水位降低约20 m,开挖区形成明显“落水洞”,地下水位变化主要体现在滑坡前缘;隧洞上部2^#次级滑体在抗滑力减弱和有效应力增大的双重作用下变形加剧,其下滑带动1^#次级滑体变形。隧洞上部2^#次级滑体最大变形量12.42 cm,但滑坡的稳定性变化较小。

关键词: 滑坡, 变形, 稳定性分析, 隧洞开挖, 渗流场

Abstract: The aim of this research is to investigate in landslide’s seepage field, slope deformation and stability affected by tunnel excavation. On the basis of analysing the physical and mechanical and water physical properties of a landslide slope, we simulated the variation of groundwater level and seepage field before and after tunnel excavation using 3D finite difference software Modflow. Furthermore, by employing Geo-Studio, we analyzed the stability and deformation of landslide after water level changed in natural and excavation conditions. Results reveal that the groundwater seepage field changed after tunnel excavation, and obvious water inflow was found at the excavation area. As a result, the groundwater level decreased about 20m and apparent “sinkholes” appeared in the excavation area. The change of groundwater level was mainly reflected in the front edge of landslide. The deformation of 2^# secondary sliding body, which caused the deformation of 1^# secondary sliding body, exacerbated under the combined actions of weakened sliding resistance and increased effective stress. The maximum slope deformation of secondary landslide above the tunnel reached 12.42 cm, but the stability changed slightly.

Key words: landslide, deformation, stability, tunnel excavation, seepage field

中图分类号:

张凡,韩爱果,任光明,杜飞,吴龙科,詹可. 隧洞开挖渗流场变化对滑坡稳定性的影响数值模拟分析[J]. 院报, 2015, 32(5): 61-65.

ZHANG Fan, HAN Ai-guo, REN Guang-ming, DU Fei, WU Long-ke, ZHAN Ke. Numerical Simulation on Landslide Stability Affected by Seepage FieldVariation Caused by Tunnel Excavation[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2015, 32(5): 61-65.

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隧洞开挖渗流场变化对滑坡稳定性的影响数值模拟分析

Numerical Simulation on Landslide Stability Affected by Seepage FieldVariation Caused by Tunnel Excavation

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