【作者】 宋少华； 陈明； 王德平； 陶东军； 何良德； 陈志芳；

【Author】 Song Shaohua~1 Chen Ming~1 Wang Deping~1 Tao Dongjun~1 He Liangde~2 Chen Zhifang~3 (1.Suzhou Expressway Construction Headquarter,Jiangsu Suzhou 215007; 2.Communication College of Hehai University,Jiangsu Nanjing 210098; 3.Jiangsu Provincial Communication Planning and Design Institute,Jiangsu Nanjing 210005)

【机构】 苏州市高速公路建设指挥部； 河海大学交通学院； 江苏省交通规划设计院；

【摘要】 PTC疏桩复合地基由于置换率小,应力场、位移场的分布特点与一般刚性桩复合地基不同。本文基于荷载分配及其附加应力场的特点,提出了一种新的沉降计算方法,分别计算桩、土荷载所引起的沉降。认为对桩体荷载引起的沉降,可仅考虑下卧层的压缩;对桩间土荷载,可直接计算作用在天然地基上的沉降。通过实例计算分析,对沉降计算方法进行简化,提出了简单实用的拟应力修正法,以及通过控制桩帽、土应力比确定桩帽尺寸的方法。更多还原

【Abstract】 PTC sparse pile composite foundation is different from common rigid pile composite foundation because of small replacement rate and distribution characteristics of stress field and displacement field.Based on load distribution and its characteristics of additional stress field,the paper put forward a new settlement calculation method to calculate the settlement caused by pile load and earth load respectively.The paper believed that the settlement caused by pile load,only compression on underlying stratum can be considered;for the load caused by earth among piles,the settlement impacted on natural foundation may be calculated directly. Through analysis on actual example calculation,it simplified the method of settlement calculation and put forward a simple and practical method for quasi-stress modification, and a method to determine pile cap dimension by controlling pile cap,and earth stress ratio.更多还原