软粘土海床中单桩基础水平循环承载与变形特性试验研究  

The study on single pile model test in soft clay under cyclic lateral loading

作　　者：张方 刘继滨[2] 吴金标[3] 

机构地区：[1]四川省建筑科学研究院,四川成都610081 [2]中铁西南科学研究院有限公司,四川成都611731 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《四川建筑科学研究》2017年第6期56-60,共5页Sichuan Building Science

摘　　要：通过开展室内软粘土海床地基中单桩基础水平静载和水平循环荷载模型试验,研究了单桩基础的水平承载与变形特性。主要有以下结论:(1)水平静载作用下,单桩基础极限承载力约为100 N,桩身最大弯矩大约位于z=4D位置处;(2)水平循环荷载作用下,单桩基础桩身弯矩和位移随着循环加载次数增加,桩身最大弯矩位于z=3~4D位置处,并提出了水平循环荷载下桩身位移计算模型。同时,基于试验结果,本文建议用于表征土体在循环荷载作用下的弱化效应系数A取值为0.52较为合理。A series of indoor laboratory tests were conducted to investigate the behavior of single pile foundation under lateral static and cyclic loads. The conclusions are shown as followed ： （1） The ultimate lateral capacity of single pile under lateral static loading is 100 N and the maximum bending moment is located at ^ =4Z）; （2） During the lateral cyclic loading, the deflection and bending moment along the pile increase with loading cycles,and the maximum bending moment is located at z = 3 - 4Z）. Calculation model of pile displacement under the lateral cyclic loading is put forward. Meanwhile,based on the test results,the cyclic reduction values A of the soil resistance under cyclic loads is suggested to take 0. 52 which is more reasonable.

关 键 词：单桩基础 软粘土海床地基 水平循环荷载 P-Y曲线 

分 类 号：TU473[建筑科学—结构工程]