抗滑桩截面尺寸对土拱性状的影响

INFLUENCE OF SECTIONAL DIMENSION OF STABILIZING PILES ON SOIL ARCHING CHARACTERISTICS

抗滑桩在高边坡的治理中应用广泛,土拱性状(包括土拱类型和土拱高度)对抗滑桩的设计有重要意义,而土拱性状会受抗滑桩截面尺寸的影响。本文首先采用数值模拟分析桩截面尺寸对土拱性状的影响;继而结合力学计算解释土拱类型及土拱高度变化的原因。结果表明,在桩间净距一定的情况下,随着桩截面尺寸的减小,土拱类型更易于从端承拱过渡到摩擦拱。对于端承拱,土拱高度主要受桩背宽度及桩背所受应力的影响,且随着桩背宽度的增大,土拱高度随之增大。对于摩擦拱,土拱高度主要受桩截面高度及桩截面高度所受应力的影响,且随着桩截面高度的增大,土拱高度也随之增大。

The stabilizing pile is widely used in the governance of the high slope.And the soil arch characters,including the soil arching type and the soil arching height,which may be affected by the sectional dimesion of the stabilizing pile,have an important role in the design of the stabilizing pile.This paper firstly adopts the numerical simulation technique to research the influence of the sectional dimesion to the soil arching characters,then this paper combines with the mechanical calculation to explain the reasons for changes of soil arching types and soil arching heights.The result shows that under the circumstance that the clear distance between piles is definite,along with the decrease of the pile sectional dimesion.The soil arching type is more likely to transfer from the end bearing arching to the friction arching.As for the end bearing arch,the soil arching height is mainly affected by the width and suffered pressure of the pile back.Along with the increase of the width of piles,the height of the soil arching increases.As for the friction arching,the soil arching height is mainly affected by the height and suffered pressure of the pile section.Along with the increase of the height of the pile section,the height of the soil arching increases accordingly.