摘要
针对巴基斯坦PKM高速公路桥梁桩基沉降问题,以QK667长桥1号桩基工点处的土工试验数据和现场单桩堆载试验测试成果为基础,分析了加载-卸载作用下桩侧土物理性参数与桩身形变规律,总结了承载力作用下桩-土沉降机理。结果表明:在瞬时荷载作用下,桩侧土密度、比重、压缩变形量与塑性指数呈正相关,呈现线弹性变化,桩顶最大沉降值为8.14mm;卸载完成后的桩侧土的孔隙比、天然含水率和压缩系数与沉降变化呈负相关,桩基和土体发生部分回弹变形,存在残余变形,最大残余量为1.94mm;短期加载-卸载过程中桩身压缩变形较大,随着埋深的增大,桩端阻力及桩侧摩阻力呈现增大的趋势,沿着桩身呈非线性分布。
This paper is focused on addressing the settlement of the pile foundation of the PKM highway bridge in Pakistan,according to the geotechnical and pile loading test results data at the QK667 Long Bridge.The study describes a compression and settlement mechanism of the soil and pile,and analysis about the physical parameters of soil and defornation of the pile under loading or unloading.Results show that,under instantaneous load,a positive correlation exists between the natural density,specific gravity,compression deformation and the plastic index,showing a linear elasticity change,and the maximum settlement value at the pile top is 8.14 mm;a relative correlation exists between natural moisture content,compression coefficient and settlement changes.Part of the pile foundation and soil mass undergoes spring deformation and residual deformation,with a maximum residual amount of 1.94 mm.During short-term loading-unloading process,the compression deformation of the pile body is larger.The resistance and the friction of the pile tend to have a gradual increase from depth,which is distributed non-linearly along the pile body.
作者
马大男
韩雪
周远海
MA Danan;HAN Xue;ZHOU Yuanhai(Sinohydro Bureau 11 Co.,Ltd.,Zhengzhou,Henan 450001,China;School of Civil Engineering,Heilongjiang University of Science&Technology,Harbin,Heilongjiang 150022,China)
出处
《施工技术》
CAS
2020年第S01期1618-1622,共5页
Construction Technology
基金
黑龙江省自然科学基金项目(E201462)
关键词
单桩
荷载
沉降机理
相关性
非线性
single pile
load
settlement mechanism
correlation
nonlinearity
作者简介
马大男,工程师,E-mail:898531033@qq.com
