用三维有限元法对超长单桩承载性能的研究

为了研究超长单桩与普通单桩承载性能的异同,基于有限元-荷载传递联合法,利用通用有限元软件ABAQUS,对均匀土中超长单桩的承载性状进行了分析研究。具体分析了桩长、桩径对超长大直径桩承载性能的影响,桩长越长,单桩极限承载力越高,同样荷载条件下桩顶位移越小,但这种提高的趋势变缓;桩径越大,相应桩的极限承载力越低;桩顶荷载位移曲线基本呈缓变型。桩身压缩量随桩长增加而增加,随荷载增加的变化基本上呈线性变化,但是桩长越长,这种变化表现出非线性,即桩身压缩量随桩顶荷载增加的趋势变大。

Study on Bearing Characters of Super-long Single Pile Using 3D FEA Method

For studying the difference of bearing characters between super-long pile and common pile,bearing characters of super-long single pile was studied by using ABAQUS program based on FEA-load transfer hybric method.How pile length and pile diameter influence bearing characters of pile was studied in detail respectively.A conclusion was made that the longer the pile,the higher the pile bearing capacity is and the less the displacement of pile head is under the same load;the bigger the pile diameter,the lower pile bearing capacity would be.Load-displacement curve of pile head varies gradually.Compression of pile was also analyzed,showing that compression of pile increases as pile length increases and compression of pile is in proportion with load on pile head approximately.But the trend is nonlinear,in other words,compression of pile increases faster than the increase of load on pile head if pile is longer.