静压桩承载力的球孔膨胀理论分析  

Theoretical analysis of spherical cavity expansion on the jacked pile bearing load

作　　者：于雪梅[1] 赵安平[1] 唐立强[2] 

机构地区：[1]黑龙江大学建筑工程学院,哈尔滨150080 [2]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001

出　　处：《黑龙江大学工程学报》2013年第3期10-13,共4页Journal of Engineering of Heilongjiang University

基　　金：黑龙江省自然科学基金项目(A2004-08)

摘　　要：利用球形孔洞膨胀模型模拟静压桩沉桩过程中桩周土体的变形,在弹塑性理论分析的基础上,采用椭圆型屈服准则描述土体的弹塑性变形,结合自相似假设建立了模型计算的控制方程,并用数值分析方法解出弹性区及塑性区的应力及其位移场,讨论了静压桩承载力、位移与土体压力敏感系数之间的变化规律。Spherical cavity expansion model is used to simulate the deformation behavior of soil foundation near jacked pile. Based on the elastic-plastic theory, the elliptic yield criterion is adopted to describe elasto-plastic behavior of soil foundation, the control equation is derived via self similar hypothesis, and the stresses field, displacement field in both elastic and plastic zone are worked out by numerical analysis methods. Numerical calculations show that the bearing stresses and displacement near the pile are much bigger and the values of them have relationship with the pressure sensitive coefficient of soil foundation being penetrated.

关 键 词：静压桩承载力 球形孔洞扩张 椭圆形屈服准则 压力敏感系数 

分 类 号：O344.3[理学—固体力学]