雨水入渗对膨胀岩隧道及其围岩渗流场与应力场的影响分析  

Analysis of the Influence of Rainwater Infiltration on the Seepage Field and Stress Field of Expansive Rock Tunnel and its Surrounding Rock

作　　者：黄韬 欧孝夺[2] HUANG Tao;OU Xiaoduo(Nanning Urban and Rural Planning and Design Research Institute,Nanning,Guangxi 530002,China;Guangxi University,Nanning,Guangxi 530000,China)

机构地区：[1]南宁市城乡规划设计研究院市政设计一所,广西南宁530002 [2]广西大学,广西南宁530000

出　　处：《公路工程》2021年第1期23-28,共6页Highway Engineering

基　　金：国家自然科学基金地区项目(51168004)。

摘　　要：膨胀岩土在降雨的情况下会出现明显的体积变化。采用数值模拟方法研究了雨水入渗对膨胀岩隧道及其围岩稳定性能的影响。主要的结论如下:膨胀岩土体的含水率大小直接影响着其膨胀量。土体的含水率越高,随着时间的增加,其最终形成的膨胀量越小。不同的含水率下,土体的膨胀量随着时间的变化趋势基本一致;雨水入渗的情况下,膨胀岩隧道顶部的围岩会发生沉降的现象,而隧道底部围岩基本不受降雨的影响;随着降雨时间的增加,膨胀岩隧道的围岩土体膨胀力会随着其含水率的增加而增大,隧道围岩发生剪切破坏的范围也会逐步扩大。Expansive rock and soil will show obvious volume changes under rainfall.In this paper,numerical simulation method is used to study the influence of rainwater infiltration on the stability of swelling rock tunnel and its surrounding rock.The main conclusion is as follows:The water content of swelling rock and soil directly affects its swelling capacity.The higher the water content of the soil,the smaller the amount of swelling that will eventually be formed as time increases.Under different water content,the swelling volume of the soil has basically the same trend with time;under the condition of rainwater infiltration,the surrounding rock at the top of the swelling rock tunnel will settle,while the surrounding rock at the bottom of the tunnel is basically not affected by rainfall.Impact:As the rainfall time increases,the swelling force of the surrounding rock and soil mass of the swelling rock tunnel will increase with the increase of its water content,and the range of shear failure of the tunnel surrounding rock will gradually expand.

关 键 词：膨胀岩隧道 雨水入渗 含水率 剪切破坏 

分 类 号：U451[建筑科学—桥梁与隧道工程]