河池机场填石高填方土基工后沉降离心模型试验研究  

Centrifugal model tests on post-construction settlement of high embankment of Hechi Airport

作　　者：张军辉 黄湘宁[1] 郑健龙[1] 韦建明 徐先进 

机构地区：[1]长沙理工大学公路工程教育部重点实验室,湖南长沙410004 [2]广西河池机场有限公司,广西河池547000

出　　处：《岩土工程学报》2013年第4期773-778,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划项目(973计划)(2011CB411910);国家高技术研究发展计划项目(863计划)(2012AA112504);国家自然科学基金项目(51108048);西部交通建设科技项目(2009318000062;2009319825090);交通运输部道路结构与材料行业重点实验室开放基金项目(kfj110202)

摘　　要：结合工程实例,采用不等应力模型设计方案,以梯形分布相似法配制填料,开展河池机场高填方土基工后沉降的离心模型试验研究。试验结果表明:无论是变化规律还是单位土基填高的沉降量,与现场监测结果具有良好的一致性;不同填料土基道肩沉降均大于场道中心,土基顶面呈"马鞍形"分布;试验结束后土基顶面、坡面未出现裂缝,表明河池机场填石高填方土基面临的主要工程问题不是失稳破坏,而是过大的沉降变形控制。最后,选择指数回归参数模型对工后沉降进行预测,预测结果表明,无论是工后沉降、残余沉降、沉降坡差还是沉降速率,煤矸石土基因针片状颗粒含量高、基材强度较低将导致更大的沉降变形和更长的工期。Taking the high embankment of Hechi Airport as an example, the centrifugal model tests are carried out based on an unequal stress model design plan. The filling stones for tests are made by means of the similarity method of trapezoid distribution. The test results of change and settlement of unit fill height are consistent with the field data. The settlement of the shoulder is larger than that in the center of the embankment surface which presents saddle shape. There are no cracks in the embankment. It is shown that the main problem of the high embankment of Hechi Airport is not landslide or failure, but too large settlement. Finally, the exponential model is selected to predict the final post-construction settlement. Regardless of the post-construction settlement, residual settlement, grade and settlement rate, the results show that the gangue filling embankment will have large settlement and long construction period because of high content of flat-elongated particles and low strength of base materials.

关 键 词：高填方土基 离心模型试验 粒径效应 工后沉降 指数模型 

分 类 号：TU41[建筑科学—岩土工程]