基于土拱理论的两种桩型抗滑性能对比分析

摘要

In order to avoid the existence of the soil arch effect between adjacent anti⁃slide piles, the triangular compressive region, which locates in the rear side of the pile body, tends to be failure;as a result, pile spacing design cannot give full play to the role of anti⁃slide piles. Anti⁃slide piles, of which the section shape is isosceles triangle, is put forward to ensure that the triangular compression region is not produced. The spacing of anti⁃slide piles with rectangular and triangular cross section is given in the view of stress analysis of soil arch, static equilibrium condition and strength condition of arch foot section. Finally, anti⁃slide capacity per unit sectional area of triangular piles is proved to be better than that of rectangular piles. For better economic benefits, rectangular anti⁃slide piles with relatively small spacing can be used in practical engineering.%为避免由于相邻抗滑桩间土拱效应的存在，使得位于桩后三角形受压区的土体发生破坏，导致所设计的桩间距不能充分发挥抗滑桩作用，提出了一种不产生三角形受压区的截面形状为等腰三角形的抗滑桩。从土拱受力分析出发，并以桩间静力平衡条件、拱脚截面强度条件分别建立起矩形和三角形截面桩桩间距表达式。工程算例表明，三角形截面桩单位截面面积有效抗滑能力较强，在实际工程中可采用相对小间距的三角形截面桩，以提高整体经济效益。