考虑填土压实度的主动破裂带模型试验研究  

Model Test of Active Fracture Zone Considering Compaction Degree of Fill Soil

作　　者：刘晓红[1] 王宇鑫 刘昱辰 蔡海星 刘三县 LIU Xiaohong;WANG Yuxin;LIU Yuchen;CAI Haixing;LIU Sanxian(School of Construction&Engineering,Hunan Institute of Science and Technology,Yueyang 414006,China;Yueyang Baili Surveying Technology Co.,Ltd.,Yueyang 414000,China)

机构地区：[1]湖南理工学院土木建筑工程学院,湖南岳阳414006 [2]岳阳百利勘测科技有限公司,湖南岳阳414000

出　　处：《湖南理工学院学报(自然科学版)》2025年第1期37-44,共8页Journal of Hunan Institute of Science and Technology(Natural Sciences)

基　　金：湖南省自然科学基金项目(2024JJ7209);湖南省研究生科研创新项目(CX20231231)。

摘　　要：基于数字图像测量技术及GOM图像分析软件,利用自主研发的刚性挡墙模型试验装置,针对填土压实度λ这一参数,展开三种变位模式(TT、RT、RB模式)下不同压实度填土的主动破坏模型试验.试验结果表明:(1)TT模式下不同压实度λ有限土体主动破裂带为始于墙踵、止于填土面的折线或直线.随λ的增大,破裂带由折线逐渐转变为直线,墙后填土由有限土体逐渐转变为半无限土体,其临界压实度λ_(cr)介于84.5%~89.7%.折线型破裂带由往返于固定挡墙与活动挡墙之间的多条线段组成,组成折线型破裂带的段数随λ的增大而减少,直线型破裂带随λ的增大逐渐变陡.(2)TT、RT模式下半无限土体主动破裂带形态特征基本相似,其破裂带均为始于墙踵、止于填土面的抛物线曲面,且均随λ的增大而逐渐变陡,破裂体体积均随λ的增大逐渐减小.(3)RB模式下半无限土体主动破裂带为始于填土表面、止于活动挡墙中下部的直线或一组近似平行的直线,均不经过墙踵,破坏体内所包含的破裂带条数随λ增大而减少.(4)TT、RT模式下主动破裂带自下而上逐层滑动的发展趋势类似于牵引式滑坡的形成机理,RB模式主动破裂带自上而下逐层滑动的发展趋势类似于推移式滑坡的形成机理.Based on digital image measurement technology and GOM image analysis software,the independently developed rigid retaining wall model test device is used,for the parameterλ,the compactness of filling soil,the active failure model tests of filled soil with different compaction degrees under three displacement modes(TT,RT,and RB modes)were carried out.The experimental results show that:(1)The active fracture zone of limited soil mass is a broken line or straight line starting from the wall heel to filling surface under different compaction degreesλin TT mode.With the increase ofλ,the fracture zone gradually changes from a broken line to a straight line,and the fill behind the wall gradually changes from a limited soil mass to a semi-infinite soil mass,with its critical compaction degreeλcr ranged from 84.5%~89.7%.The broken line fracture zone is composed of multiple line segments that travel back and forth between the fixed retaining wall and the movable retaining wall,the number of segments constituting the broken line fracture zone decreases with the increase ofλ,the linear fracture zone steepens gradually with the increase ofλ.(2)The morphological characteristics of active fracture zones of semi-infinite soil mass in TT and RT modes are basically similar,and their fracture zones are all parabolic curved surfaces starting from the wall heel to the filling surface,and they become gradually steeper with the increase ofλ,and the volume of the fracture body gradually decreases also.(3)The morphological characteristics of the active fracture zone of semi-infinite soil mass in RB mode is a straight line starting or a group of nearly parallel straight lines,from the filling surface and ending at the middle and lower parts of the movable retaining wall,which do not pass through the wall heel.With the increase ofλ,the number of rupture bands contained in the damaged body decreases.(4)The development trend of active fracture zone sliding layer by layer from bottom to top under TT and RT modes is similar to the forma

关 键 词：压实度 破裂带 变位模式 有限土体 半无限土体 

分 类 号：TU43[建筑科学—岩土工程]