深厚软土中承式桩板复合地基受力与变形特性试验研究  

Experimental Study on Stress and Deformation Characteristics of Intermediate Pile-Plate Composite Foundation in Deep Soft Soil Area

作　　者：张元帅 ZHANG Yuanshuai(China Railway 22nd Bureau Group Co.,Ltd.,Harbin 150006,China)

机构地区：[1]中铁二十二局集团第一工程有限公司,黑龙江哈尔滨150006

出　　处：《河南科技》2022年第21期77-80,共4页Henan Science and Technology

摘　　要：开展现场试验,研究深厚软土区中承式桩板复合地基桩土应力和分层沉降。结果表明:当路基填土高度在桩板结构承台板以下时,随着路基填土荷载的增大,桩顶应力和桩间土压力逐渐增大;当填土高度大于承台板标高后,路肩下桩顶应力和桩间土压力大于承台板下的桩顶应力和桩间土压力;当承台板上基床填筑完成后,承台板下桩间土压力随着时间的推移逐渐减小,地基面桩间土压力呈缓慢减小规律,而桩顶应力逐渐增大,随着预压时间的增大,路基中心处、路肩下和最靠近坡脚处的桩土应力比均呈缓慢增大规律,但是增幅较小;当上部荷载恒定后,地基变形后期沉降主要发生在下卧层位置。Field tests were carried out to study the pile and soil stress and stratified settlement of composite foundation of intermediate pile-plate composite foundation.The results show that the stress on the pile top and the soil pressure between piles gradually increase with the increase of the embankment fill load when the embankment fill height is below the pile plate.The stress on the pile top and the soil pressure between piles under the road shoulder are greater than the stress on the pile top and the soil pressure between piles under the bearing plate is greater than the elevation of the bearing plate when the fill is height.When the foundation bed on the bearing platform is filled,the soil pressure between piles under the bearing platform decreases gradually with the passage of time,the soil pressure between piles on the foundation surface decreases slowly,and the stress on the pile top increases gradually.With the increase of preloading time,the pile-soil stress ratio at the center of the subgrade,under the road shoulder and nearest to the foot of the slope all increased slowly,but the increase was small.When the upper load is constant,the settlement in the later stage of foundation deformation mainly occurs in the lower horizontal layer.

关 键 词：深厚软土区 中承式桩板复合地基 变形特性 试验研究 

分 类 号：TU472[建筑科学—结构工程]