考虑土体自重应力场的拱效计算方法

抗滑桩是用于加固边坡，防止边坡滑移失稳的主要措施，土拱体易在桩间形成.本文将桩间土拱简化为水平拱，并假定处于平面应变状态，在考虑土体自重应力场前提下，对桩侧摩阻力为拱座的拱体计算方法进行了研究，揭示了土体的自重应力场对桩土拱体的量化影响.研究结果表明：自重应力场的存在对桩间土拱效应起着明显的加强作用，不考虑土体的自重应力场，也就是把土体看成是无重介质，进行桩土拱体模式的设计过于安全.

Calculation of Soil Arch Effect in View of Gravity Stress Field

Anti-slide piles are a main measure to reinforce slope for slope stability engineering, in which soil arch is easily formed between piles. Soil arch supported by adjacent piles is assumed to be horizontal and usually kept in plane strain status in vertical direction. It studies the calculating method of the soil arch supported by side surface friction of piles, which is combined with soil mass gravity. Then the influence of the soil gravity on arch bodies is further investigated in the view of quantity calculation. The research results show that the arch body in soil mass if considered to be weightless,is very safe for design purpose, because the gravity stress of soil mass has an important strengthening effect on the soil arch bodies formed between adjacent piles.