第39募第2期 2017年4月
土木建筑与环境工程
Journal of Civil,Architectural&Environmental Engineering
doi:10.11835/j.issn.1674-4764.2017.02.015
m法下的双曲线型p-y曲线
李微哲1,2，娄平1
Vol. 39 No. 2 Apr.2017
台然尚
(1.中南大学土木工程学院，长沙410012;2.中煤科工集团重庆设计研究院有限公司，重庆400016) 摘要：工程中基桩大多处于复杂的成层地基中，鲜有位于单一土层中，从宏观角度出发，引入初始地基比例系数，提出了基于m法的双曲线型p-y曲线。某现场7根试桩地基土非线性显著，实测和理论计算的地面处柱身水平位移一水平荷载关系曲线均呈良好的二次抛物线关系，且理论与实测曲线吻合良好，验证了本文P-y曲线模型。地基土非线性对桩身最大矩、桩侧地基土压力影响显著，不容急略。工程实际中采用m法计算基桩最大害矩值偏小，建议乘以1.05～1.25的系数，以计入地基土非线性影响。
关键词：m法；初始地基比例系数；双曲线型p-y曲线；基桩
中图分类号：TU473.1
文献标志码：A
文章编号：1674-4764(2017)02-0115-08
Analysisofpilebyp-ycurvemethodbased onm-method
Li Weizhe1-2,Lou Ping
(1., College of Civil Engineering,Central South University, Changsha 410000,P, R, China;2, China Coal
Technology &. Engineering Group, Chongqing Design &. Research Institute Co. Ltd. , Chongqing 400016,P. R, China)
Abstract:Most piles are set in layered soils. The initial foundation coefficient, a hyperbolic p-y curve containing a parameter, is derived to generally simulate the nonlinear soil around the pile. The soil around the tested pile is nonlinear, and both the tested and the calculated lateral displacement of the tested pile at the ground have a parabolic relation with the horizontal loads. The calculated lateral displacements of the tested pile at the ground fit the tested lateral displacements very well, and the hyperbolic p-y curve is proved good. The nonlinear soil will greatly increase both the maximum moment of the pile and the soil pressure. Thus it is suggested that the designed moment of the pile which is calculated by m-method,
should magnified 1. 05~1. 25 times in order to consider the nonlinearity of the soil around the pile. Keywords:m-method; the initial foundation coefficient, hyperbolic p-y curve; pile
模拟桩侧非线性土一般采用p-y曲线法。学者们此进行了大量室内模型试验研究，提出了很多不同形式的P-曲线。但基于现场试桩水平承载力试验并从宏观角度研究p-y曲线的极少。
Matlock(2}，Reese等(}，Stvens等提出了粘性土P-y曲线，其桩侧土压力与桩身水平位移成幕
收稿日期：2016-07-08
函数关系；王惠初等6]、田平等[]基于钢管模型桩试验提了河海大学新统一法，其桩侧粘土压力与桩身水平位移为双曲线函数关系。API规范中砂土p-y 曲线、王腾等"基于钢管模型桩试验提出的粉土P-3 曲线、戚春香等提出的弱饱和土p-y曲线，其桩侧土压力与水平位移为双曲正切函数关系。王国粹
作者简介：李微暂（1981-），男，高级工程师，博士生，主要从事桩基础及路基稳定研究，(E-mail)46414461①qq.com。 Received;2016-0708
Author brief:Li Weizhe(1981-), senior engineer, PhD candidate, main research interests; pile foundation and subgrade
engineering, (E-mail)46414461@qq. com.
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