减沉桩在软土区浅地基加固中的分析和设计.pdfVIP

减沉桩在软土区浅地基加固中的分析和设计 徐赐敏 赵卫华 (上海宝冶工程技术有限公司 上海200941) 摘 要：在上海地区的大批校安抗震加固工程中，有些校舍抗震能力极差，上部采用钢筋混凝土板墙抗 震加固后，传递到基础的荷载增加量已超规范要求的“不超过原基础承受荷载的10%”，因此对原基础以减 少沉降而加固的锚杆静压短桩，通过ABAQUS 有限元对桩的荷载沉降曲线，桩侧摩擦力，桩周孔压力场，桩 端土体应力路径进行应用分析，再根据勘察报告提供的侧摩力数据，验算地基设计中强度安全满足规范要求 （安全系数取2.0），同时利用Lee 提供的单桩的沉降计算公式预估了桩的沉降值。分析认为：采用短桩进 行浅基础加固，让桩端位于第④层土淤泥质粘土，比第⑥层粉砂土，桩端土体更易破坏，从而桩与浅基础下 的土体共同载上部荷载。同时要保证强度验算要求。这样做经济又安全。本文对上海梅园小学教学楼浅基础 加固，对减沉桩分析和设计，工程实施后，根据检测数据方法是可行的。 关键词：减沉短桩；浅础加固；有限元分析；锚杆静压桩 REDUCE SEDIMENTATION PILE IN SOFT SOIL FOUNDATION REINFORCEMENT OF SHALLOW ANALYSIS AND DESIGN Xu cimin Zhao weihua （ShangHai Baoye Group Corp., LTD, ShangHai 200941, China ） Abstract: Large number of schools in the Shanghai area seismic retrofit project safety , some poor seismic capacity of school buildings , the upper seismic strengthening of reinforced concrete Wall , the load transmitted to the base amount of increase exceeded the regulatory requirements under load does not exceed the original basis of 10 % and therefore to reduce the basis of the original settlement static bolt reinforcement piling through the ABAQUS finite element pile load settlement curve , pile side friction , pore pressure field pile , pile soil stress path for application analysis , according to the survey report provides the frictional force data , checking the strength safety foundation design to meet regulatory requirements ( safety factor of 2.0 ) , while taking advantage of the pile settlement provided Lee formula estimates the pile settlement values. Analysis: using a short pile shallow foundation reinforcement, so that the pile in the first layer o