圆截面静压挤土刚性短桩水平承载力研究  

STUDY OF LATERNAL BEARING CAPACITY FOR CIRCULAR RIGIDITY SHORT STATIC COMPACTION PILE

作　　者：杨庆光[1] 罗善煌[1] 刘杰[1] 周斌[1] 

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《工业建筑》2014年第1期75-78,共4页Industrial Construction

基　　金：国家自然科学基金项目(51208194);湖南省教育厅资助项目(11C0419)

摘　　要：基于Vesic圆孔扩张理论和M-C屈服准则,提出一种圆截面静压挤土桩不同深度位置桩侧土压力的计算方法;在此基础上,利用桩土接触面无相对位移的假设,建立了挤土刚性短桩发生水平位移时桩侧土压力计算公式,并根据力平衡关系得到静压挤土刚性短桩水平承载力估算方法。为了验证理论公式的可行性,对水平荷载作用下静压挤土刚性短桩进行理论和现场试验对比研究,试验及理论结果表明,在同一深度位置,挤土刚性短桩桩侧土压力比非挤土桩大得多,且桩侧土压力随水平位移的产生出现重新分布现象。此外,采用推荐的估算方法得到的桩身水平承载力理论值与实测结果吻合较好,验证了该方法的可行性。Based on Vesic theory of expansion of cavity and Mohr-Coulomb criterion, a method was proposed which can calculate earth pressure around static compaction pile in different depth. Further more, a new analytical solution for earth pressure around rigidity short static compaction pile with horizontal displacement was deduced based on assumed condition of no relative displacement on pile-soil contact boundary. Finally, according to the force balance condition, an estimation method for horizontal bearing capacity for rigidity short static compaction pile was presented. In order to validate the feasibility of the proposed approach, a comparative research was carried out. Experimental and theoretical results indicated that earth pressure on pile-soil contact boundary of pile with compaction was much higher than of the pile without soil compaction and earth pressure would redistributed with the change of horizontal displacement. Moreover, the horizontal bearing capacity calculated by the method in this paper accorded well with the result measured in field which verified the feasibility of the theoretic method.

关 键 词：静压桩 圆孔扩张 水平承载特性 挤土桩 

分 类 号：TU473.1[建筑科学—结构工程]