富水黄土隧道围岩软化对结构受力影响研究  

Study on the impact of surrounding rock softening on the stresses of the water-rich loess tunnel structure

作　　者：张堂杰 Zhang Tangjie(JSTI Group Co.,Ltd.,Nanjing Jiangsu 210017,China;Engineering Research Center of Underground Space Detection Technology of Jiangsu Province,Nanjing Jiangsu 210017,China)

机构地区：[1]苏交科集团股份有限公司,江苏南京210017 [2]江苏省地下空间探测技术工程研究中心,江苏南京210017

出　　处：《山西建筑》2024年第4期158-163,共6页Shanxi Architecture

摘　　要：以银百高速榆林子隧道为依托工程,通过有限元软件ABAQUS温度场模块摸拟隧道施工围岩软化过程,研究了富水黄土隧道围岩在不同软化阶段和软化范围工况下,隧道围岩、初期支护、仰拱填充层的位移和应力的变化规律。结果显示:拱顶沉降和仰拱填充层隆起随软化范围的扩大而增大,而隧底隆起减小,仰拱填充层隆起在软化范围3 m时趋于稳定;围岩软化对仰拱填充层中心影响最大,而仰拱填充层拱脚处几乎不受影响;围岩软化后在初期支护拱脚位置产生最大拉应力,拱墙和拱顶应力变化不明显;塑性区以内是围岩软化的主要影响范围,需特别关注塑性区内的地下水赋存状态。Based on the finite element software ABAQUS temperature field module,the softening process of surrounding rock during construction of the Yulinzi Tunnel of Yinbai Expressway have been simulated.And study on the water-rich loess tunnel surrounding rock under different softening stages and varied softening ranges was carried out,including the change laws of the displacement and stress of primary lining and backfill layer.The results show that as the softening range expands,the vault settlement and the uplift of backfill layer increase while the uplift of arch bottom decreases.And when the softening range expands to 3 meters,the uplift of backfill layer tends to be stable;It is the center of backfill that the surrounding rock softening exerts its greatest impact on and the arch foot of backfill stays almost unaffected;After surrounding rock is softened,the maximum tensile stress is generated at the arch foot of primary lining,and the stress of the arch wall and vault does not change significantly;The main influence area of surrounding rock softening proved to fall within the plastic zone which should be paid special attention to for its occurrence of groundwater.

关 键 词：富水黄土 软化 围岩变形 衬砌应力 数值模拟 

分 类 号：TU457[建筑科学—岩土工程]