水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2011年
6期
19-23
,共5页
沉渣厚度%端承摩擦桩%端阻力%侧摩阻力%钻孔灌注桩
沉渣厚度%耑承摩抆樁%耑阻力%側摩阻力%鑽孔灌註樁
침사후도%단승마찰장%단조력%측마조력%찬공관주장
dregginess thickness%end-bearing friction pile%point resistance force%side friction%bored pile
施工中孔底沉渣对桩基承载力的影响较大。通过试桩试验对孔底沉渣厚度与端承摩擦桩极限承载力关系进行了探讨，在同一桩径下，当孔底沉渣厚度相同（均为10mm）时，最大单位摩阻力变化率、单位端阻力变化率均不大，当孔底沉渣厚度相差较大（分别为10mm／1与250mm）时，最大单位摩阻力下降了45．15％，单位端阻力下降了69．92％，经分析可知，孔底沉渣厚度变大导致桩侧摩阻力与端阻力同时降低，孔底沉渣厚度对桩极限承载力影响显著。
施工中孔底沉渣對樁基承載力的影響較大。通過試樁試驗對孔底沉渣厚度與耑承摩抆樁極限承載力關繫進行瞭探討，在同一樁徑下，噹孔底沉渣厚度相同（均為10mm）時，最大單位摩阻力變化率、單位耑阻力變化率均不大，噹孔底沉渣厚度相差較大（分彆為10mm／1與250mm）時，最大單位摩阻力下降瞭45．15％，單位耑阻力下降瞭69．92％，經分析可知，孔底沉渣厚度變大導緻樁側摩阻力與耑阻力同時降低，孔底沉渣厚度對樁極限承載力影響顯著。
시공중공저침사대장기승재력적영향교대。통과시장시험대공저침사후도여단승마찰장겁한승재력관계진행료탐토，재동일장경하，당공저침사후도상동（균위10mm）시，최대단위마조력변화솔、단위단조력변화솔균불대，당공저침사후도상차교대（분별위10mm／1여250mm）시，최대단위마조력하강료45．15％，단위단조력하강료69．92％，경분석가지，공저침사후도변대도치장측마조력여단조력동시강저，공저침사후도대장겁한승재력영향현저。
The influence of the dregginess in hole bottom on the bearing capacity of pile foundation is comparatively large. The relationship of the dregginess thickness in hole bottom and the ultimate beating capacity of end-bearing friction pile is explored here by test-pile test. In same pile diameter, when the dregginess thickness in hole bottom is identical （10mm）, both the variation of maximum unit side friction and the variation of maximum unit point resistance force are slight. When the dregginess thickness in hole bottom has large difference （lOmm and 250mm respectively）, the variation of maximum unit side friction is decreased by 45.15 %, and the variation of maximum unit point resistance force is decreased by 69.92%. In conclusion, the increasing of the dregginess thickness in hole bottom would make the side friction and point resistance force decreasing simultaneously. The influence of the dregginess in hole bottom on the ultimate beating capacity of pile foundation is significant.
