静载作用下新疆戈壁砾石土高填方路基稳定性分析  

Stability Analysis of High-fill Subgrade of Xinjiang Gobi Gravel Soil under Static Loading

作　　者：高鹏举 丁建文[1] 孙帅 魏霞[1] GAO Pengju;DING Jianwen;SUN Shuai;WEI Xia(School of Transportation,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学交通学院,江苏南京211189

出　　处：《防灾减灾工程学报》2024年第6期1448-1456,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51978159)资助。

摘　　要：为了研究荷载作用下戈壁砾石土填筑路基的变形规律,以新疆乌鲁木齐机场改扩建工程中路基填筑采用的戈壁砾石土填料为研究对象,采用室内模型试验对荷载作用下新疆戈壁砾石土高填方边坡的变形破坏特征展开了探讨,并结合三维有限元方法分析了填料压实度和边坡坡比对边坡安全系数的影响,得到了静载加压下以及土工格栅加固之后的高填方边坡位移荷载曲线。研究结果表明:边坡竖向位移最大值发生在荷载下方靠近坡面一侧;边坡水平位移最大值出现在坡肩处;土工格栅的加入使得同等荷载下的土体变形减小约61%。戈壁砾石土填料压实度变化会影响土体黏聚力c值,从而影响边坡的安全系数;压实度小于86%或者大于92%时,安全系数趋于稳定变化;压实度介于86%~92%时,边坡的安全系数增长显著。In order to study the deformation characteristics of the embankment subgrade made of Gobi gravel soil under load,this study chose the Gobi gravel soils used in the embankment filling of the Urumqi International Airport expansion project as the research object.Indoor model tests were con-ducted to explore the deformation and failure characteristics of high embankment side slopes of Xinji-ang Gobi gravel soil under load.Additionally,a three-dimensional finite element method was applied to analyze the effect of compaction degree and side slope ratio on the slope safety factor.The displace-ment-load curves of the high embankment side slopes under static load and after reinforcement with geogrid were obtained.The results indicated that the maximum vertical displacement of the slope oc-curred beneath the load near the slope surface.The maximum horizontal displacement of the slope oc-curred at the slope shoulder.The inclusion of geogrids reduced the soil deformation by about 61%un-der the same load.The compaction degree of Gobi gravel soil affected the soil cohesion(c value),thus affecting the slope safety factor.When the compaction degree was less than 86%or greater than 92%,the safety factor of the slope tended to stabilize;when the compaction degree was between 86%and 92%,the safety factor increased significantly.The research findings provide a reference for the ex-pansion of Urumqi Airport and similar engineering projects.

关 键 词：道路工程 边坡稳定性 模型试验 戈壁砾石土 高填方边坡 数值模拟 

分 类 号：U416.14[交通运输工程—道路与铁道工程]