水泥土加固对刚性桩横向承载特性影响试验研究  

Experimental Study on Influence of Cement Soil Reinforcement on Lateral Bearing Capacity of Rigid Pile

作　　者：牛承志 Niu Cheng-zhi

机构地区：[1]中铁十九局集团第六工程有限公司,江苏无锡214028

出　　处：《建筑技术开发》2021年第6期129-131,共3页Building Technology Development

摘　　要：为研究水泥土加固效应对侧向受荷桩承载特性的影响,开展了天然地基及水泥稳定砂回填土地基下刚性桩现场侧向载荷对比试验。试验通过改变水泥土加固土柱直径及加固深度,研究加固土对桩侧向承载力的影响。试验结果表明,当采用水泥稳定砂土置换桩周土后桩侧向承载力有显著增长,且与水泥土加固直径、深度,以及天然地基土与加固土抗剪强度密切相关。同时,通过施加极限荷载,对桩顶位移及地面裂缝发展规律进行观测,揭示了侧向受荷短桩的破坏失效机制。研究结果可为新计算方法的发展提供试验支撑。In order to study the effect of cement soil reinforcement on the bearing characteristics of laterally loaded piles,field lateral load tests of rigid piles under natural foundation and cement stabilized sand backfill soil foundation were carried out.By changing the diameter and depth of soil column reinforced by cement soil,the influence of soil reinforcement on the lateral bearing capacity of pile is studied.The test results show that the lateral bearing capacity of the pile increases significantly when the soil around the pile is replaced by cement stabilized sand,which is closely related to the diameter and depth of cement soil reinforcement,as well as the shear strength of natural foundation soil and reinforced soil.At the same time,the failure mechanism of laterally loaded short piles is revealed by observing the displacement of pile top and the development law of ground cracks by applying ultimate load.The results can provide experimental support for the development of the new calculation method.

关 键 词：水泥稳定砂土 刚性短桩 侧向承载力 试验研究 破坏机理 

分 类 号：TU54[建筑科学—建筑技术科学] U213.1[交通运输工程—道路与铁道工程]