摘要
针对高速公路拓宽工程高填方路段新老路堤拼接问题,通过室内物理力学试验确定地基土、素土填料及其石灰改性土在拼接路堤填筑时的含水量和压实度控制参数;利用离心模型试验手段,进行提高填料压实度和石灰改性措施下拼接路堤协调变形试验研究。试验结果表明,将拼接路堤不同位置填料压实度从90%,93%和95%相应提高到93%,94%和96%时,能够有效减小路堤本身变形,但对差异沉降的控制效果不大。进而对素土填料进行6%石灰改性后,不但可大大减小路堤本身的变形,而且还能减小路面不同部位之间的差异沉降,提高拼接路堤的协调变形效果。现场监测数据资料表明,离心模型试验能够反映原型施工工况效果。
Based on the project of high-embankment widening of highway,the water content and degree of compaction of foundation soil,filling and improved soil by lime were determined by means of indoor physico-mechanical test.The centrifugal modeling tests were used to simulate increasing degree of compaction and improve soil by lime for coordinating deformation between new and old high-embankment widening.The test results show that the deformation of high-embankment widening was decreased,but differential settlement was not controlled effectively when the degree of compaction of high-embankment widening was increased to 93%,94% and 96% from 90%,93% and 95% correspondingly.Then both deformation of high-embankment widening and differential settlement were decreased when the filling was improved by 6% lime mixture;and the effects of deformation compatibility of high-embankment widening were enhanced.The in-situ monitoring data agree well with the results of centrifugal modeling test.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第3期580-586,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
江苏省交通科学研究计划项目
湖北省环境岩土工程重点实验室开放课题(T000508)
关键词
土力学
路堤拼接
离心模型试验
石灰改性
变形协调
soil mechanics
embankment widening
centrifugal modeling test
lime improving
compatibility of deformation
