水平荷载作用下斜桩承载变形性状数值分析

发布时间：2018-08-29 12:30

【摘要】：为研究水平受荷斜桩的承载变形性状,采用有限元软件模拟了斜桩在水平荷载作用下的性状并与直桩进行了比较,分析了桩身倾角、桩顶竖向荷载对斜桩桩身水平位移、桩身弯矩及剪力的影响,研究了斜桩与桩侧土之间的挤压、剪切相互作用,对水平受荷斜桩有效桩长的影响因素进行了探讨。结果表明:正斜桩的水平承载力比直桩大,负斜桩的水平承载力比直桩小;桩身倾角对斜桩水平位移、桩身弯矩及剪力有较大的影响;正斜桩桩顶水平位移小于直桩,负斜桩桩顶水平位移大于直桩,桩身倾角越大,斜桩与直桩桩顶水平位移差异越大;正斜桩、负斜桩的桩身弯矩均小于直桩,桩身倾角越大,正斜桩桩身弯矩越小,负斜桩桩身弯矩越大;正斜桩及负斜桩桩身剪力均小于直桩,正斜桩桩身剪力小于负斜桩桩身剪力;桩顶竖向荷载对正斜桩、负斜桩水平承载力的影响不同,竖向荷载提高了负斜桩的水平承载力,削弱了正斜桩的水平承载力;水平受荷斜桩与桩侧土之间的相互作用以挤压为主,剪切作用较弱;水平受荷斜桩存在一个有效桩长,对于相同的土层,无论是正斜桩、负斜桩,其有效桩长基本相同;桩侧上部土体剪切模量增大对减小有效桩长有显著的影响,下部土体剪切模量变化对有效桩长影响不大。
[Abstract]:In order to study the load-bearing deformation behavior of horizontal inclined pile, the behavior of inclined pile under horizontal load is simulated by finite element software and compared with that of vertical pile, and the slope angle of pile body and vertical load of pile top to horizontal displacement of inclined pile body are analyzed. The influence of pile bending moment and shear force on the extrusion and shear interaction between inclined pile and pile-side soil is studied. The factors affecting the effective pile length of horizontally loaded inclined pile are discussed. The results show that the horizontal bearing capacity of positive inclined pile is greater than that of straight pile, the horizontal bearing capacity of negative inclined pile is smaller than that of straight pile, the inclination angle of pile body has great influence on horizontal displacement, bending moment and shearing force of inclined pile, and the horizontal displacement of the top of positive inclined pile is smaller than that of straight pile. The horizontal displacement of the top of the negative inclined pile is greater than that of the vertical pile, and the greater the inclination angle of the pile is, the greater the difference between the horizontal displacement of the inclined pile and the top of the vertical pile is, and the moment of the pile body of the positive inclined pile is smaller than that of the vertical pile, and the greater the inclined angle of the pile is, the smaller the bending moment of the positive inclined pile is. The greater the bending moment of negative inclined pile is, the smaller the shear force of positive inclined pile and negative inclined pile is less than that of straight pile, the smaller the shear force of positive inclined pile is less than that of negative inclined pile body, and the effect of vertical load on the horizontal bearing capacity of negative inclined pile is different. The vertical load increases the horizontal bearing capacity of the negative inclined pile, weakens the horizontal bearing capacity of the positive inclined pile, the interaction between the horizontally loaded inclined pile and the soil around the pile is mainly squeezed, and the shear effect is weak, and there is an effective pile length in the horizontal inclined pile. For the same soil layer, the effective pile length is basically the same whether it is a positive inclined pile or a negative inclined pile, and the increase of the shear modulus of the upper part of the pile has a significant effect on the reduction of the effective pile length, while the change of the lower soil shear modulus has little effect on the effective pile length.
【作者单位】：西安建筑科技大学土木工程学院;特变电工新疆新能源股份有限公司;
【基金】：国家自然科学基金项目(51078308) 陕西省自然科学基础研究计划项目(2015JM5260)
【分类号】：TU473.1

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