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采用基于非连续介质的离散元软件PFC2d,对双排抗滑桩可能的布置方式(平行布置和交错布置)所形成的土拱效应进行分析研究,并基于土拱效应研究前后排桩间距及双排桩间距对每种布置方式下双排桩的支挡效果进行探讨。结果表明:交错布置的双排桩由于前排桩可以直接用来作为后排桩“溢出”荷载的拱脚,比平行布置的双排桩具有更优的支挡性能;随着双排桩间距的增大,两种布置方式的双排桩所能承载的荷载均呈现降低的趋势,同时交错布置的双排桩比平行布置的双排桩的极限和残余支挡荷载均要大;前后排桩间距对两种布置方式的双排桩支挡性能影响较大。建议使用交错布置来浇筑双排桩,其中双排桩间距和双排桩前后排桩间距不宜大于4倍的桩径。
Based on the discrete element software PFC2d based on discontinuous medium, the soil arching effect formed by the possible arrangement of double-row anti-slide piles (parallel arrangement and staggered arrangement) is analyzed and studied. Based on soil arching effect, Pitch spacing of piles for each arrangement of double-row pile support effect is discussed. The results show that the staggered double-row piles can be directly used as the “overflow” load of the rear piles because the front piles have better support characteristics than the double-row piles arranged in parallel. As the pile spacing increases, the loads that can be carried by the double row piles in both ways show a tendency of decreasing. At the same time, the double row piles staggered are larger than those of the double row piles arranged in parallel. Before and after the row of piles spacing of the two arrangements of double-row pile retaining performance greater impact. It is recommended to use staggered arrangement to cast double-row piles, in which the distance between double-row piles and the spacing between front and back rows of double-row piles should not be more than 4 times of pile diameter.