摘要
目的为了定量分析预制桩承载力的时间效应,从而有效地发挥预制桩承载力的潜能,减少建筑物的建造成本.方法笔者应用圆柱形小孔扩张理论分析了预制桩施工的挤土机理,并提出了一种根据常见土体参数估算桩周土体密度的方法.在此基础之上又根据土体抗剪强度与土体密度的惟一性关系,最终建立了沉桩休止期后桩周土体抗剪强度增量的理论计算公式.结果根据沉桩休止期后桩周土体抗剪强度增量的理论计算公式,可以得到估算软土地区预制桩最终极限承载力的修正方法,从而能定量估算出预制桩的最终极限承载力.结论将笔者提出的修正方法应用于工程实践,其结果与工程实测结果相比,两者较接近,说明该修正计算方法有一定的工程应用价值.
In order to analyze time effect of prefabricated pile quantificationally and use the bearing capacity of pile effectively, the author analyzed the squeezing mechanism of the pile driving in soft clay using the theory of cylindrical cavities expansion. And a method was presented to calculate the density of clay around the pile using common parameters. Subsequently, based on the unique relation between the shear bearing capacity and the density of the soil, a formula was presented, which could be used to estimate the increment of shear bearing capacity of soil around the pile and latest ultimate-bearing capacity of pile quantificationally as well. The correctional approach presented was applied to engineering in practice. The calculated results using the formula were in good agreement with that of the site measurement.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
2005年第6期663-666,670,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
霍英东青年教师基金(91079)
江苏省"六大人才高峰"项目
江苏省青年科技创新人才基金(BK2003418)
关键词
预制桩
最终极限承载力
抗剪强度
小孔理论
时间效应
软土地区
prefabricated pile, latest ultimate-bearing capacity, shear bearing capacity, theory of cylindricalcavities expansion, time effect, soft clay
