袋装砂井在沿海高速公路软基处理中的应用研究  

Application Study of Bagged Sand Well in Soft Foundation Treatment of Coastal Highway

作　　者：杨晓翠 Yang Xiaocui(China Railway 18th Bureau Group First Engineering Co.,Ltd.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《市政技术》2023年第9期156-162,共7页Journal of Municipal Technology

摘　　要：以湛江东海岛至雷州高速公路某软基路段为研究实例,对袋装砂井堆载预压法处理的3个断面进行表面沉降、最终沉降、边桩位移和孔隙水压力研究。研究结果表明,袋装砂井在沿海高速公路软基处理中可以提高软基承载力和稳定性,减小沉降量;除K30+102断面左监测点沉降量与其中、右监测点之间偏差稍大外,其余2个断面各个监测点之间沉降量偏差很小,且随着荷载的增加边桩的沉降逐渐增大,在停止加载后,沉降增加缓慢,恒载180 d后沉降趋于稳定;在深度为0.5 m处的水平位移最大,并随着深度的增加,水平位移逐渐减小;越接近排水面孔隙水压力变化越快,越远离排水面则越缓慢。通过监测数据分析可知,袋装砂井在沿海高速公路软基处理中起到了显著的效果,但随着时间的推移,仍需要定期监测和维护,以确保袋装砂井的有效性。Taking a soft foundation section of the expressway from Donghai Island to Leizhou in Zhanjiang as an example,surface settlement,final settlement,displacement of side piles and pore water pressure of three sections treated by bagged sand well preloading method were studied.The study shows that bagged sand well can improve the bearing capacity and stability of soft foundation and reduce the settlement in the soft foundation treatment of coastal expressway;Except the settlement of the left monitoring point of K30+102 section has a large deviation from that of the middle and right monitoring points,the settlement deviation of the other two monitoring points are very small.With the increase of load,the settlement of side pile gradually increase.After the loading stopping,the settlement increases slowly and tends to be stable after 180 days of dead load;The maximum horizontal displacement appears at the depth of 0.5 m,which decreases gradually with the increase of depth.The closer to the drainage surface is,the faster the pore water pressure changes.The farther away from the drainage surface is,the slower it changes.Through monitoring data analysis,bagged sand well plays a significant role in the soft foundation treatment of coastal highway.The regular monitoring and maintenance will still be required to ensure the effectiveness of bagged sand wells with times.

关 键 词：高速公路 软基 袋装砂井 沉降 监测 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU447[建筑科学—岩土工程]