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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。
In order to study the load-bearing deformation characters of inclined-piles under horizontal load, finite element software was used to simulate the behavior of inclined piles under horizontal load and compared with straight piles. The results showed that the inclination of piles, Body horizontal displacement, bending moment of pile body and shear force, the squeezing and shearing interaction between inclined pile and pile side soil is studied, and the influencing factors of effective pile length of inclined loaded pile are discussed. The results show that the horizontal bearing capacity of the inclined piles is larger than that of the straight piles and the horizontal bearing capacity of the negative piles is smaller than that of the straight piles. The inclination of the piles has a great influence on the horizontal displacement of the inclined piles and the bending moment and the shear force of the piles. The horizontal displacement of inclined pile top is less than that of straight pile. The horizontal displacement of negative gradient pile top is greater than that of straight pile. The greater the inclination of pile body, the greater the horizontal displacement of inclined pile and straight pile top. The bending moment is less than that of straight piles. The greater the inclination of piles, the smaller the bending moment of piles, the greater the bending moment of piles is. The shear capacity of inclined pile is smaller than that of negative gradient pile. The vertical load of pile top has different effect on the horizontal bearing capacity of the skewed pile and negative skewed pile. The vertical load increases the horizontal bearing capacity of negative skewed pile and weakens The horizontal bearing capacity of the diagonally inclined piles; horizontal interaction between the inclined piles and the lateral piles is mainly by extrusion, and the shearing action is weak; there is an effective pile length for the horizontally loaded piles; for the same soil , The effective pile length is basically the same whether it is a normal slant pile or a negative slant pile. The increase of the shear modulus in the upper part of the pile has a significant effect on reducing the effective pile length, and the lower soil cutting Modulus change little effect on the effective length.