均匀地基中的单桩竖向抗压刚度
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摘要
本文基于单桩竖向受压性状分析的传递函数法和剪切位移法,推导了均匀地基中单桩竖向抗压刚度的解析表达式,说明均匀地基中单桩竖向抗压刚度是确定地基条件下单桩本身固有的力学性质,取决于桩身刚度与桩周土层的地基弹性参数,并以工程实例对比了单桩竖向抗压刚度理论值与静载试验实测值。分析了桩长、桩径、桩身材料模量、桩侧土弹性模量、泊松比及桩端地基的基床系数对单桩竖向抗压刚度的影响。讨论了不同地基弹性参数及单桩几何尺寸与材料时提高单桩竖向抗压刚度、减少单桩沉降的工程措施。
Based on the load transfer method and shear displacement method for the analysis of vertical compression behavior of single pile, the analytical expression of vertical compression stiffness of single pile in uniform foundation is derived in this paper. It is shown that the vertical compressive stiffness of single pile in uniform subsoil is the inherent mechanical property of single pile, which depends on the stiffness of pile body and the elastic parameters of soil layer around pile. The theoretical value of vertical compressive stiffness of single pile and the measured value of static load test are compared with engineering examples. The influence of pile length, pile diameter, pile material modulus, pile side soil elastic modulus, Poisson's ratio and coefficient of subgrade reaction of pile tip foundation on the vertical compressive rigidity of single pile is analyzed. The engineering measures are discussed in order to improve the vertical compressive rigidity of single pile and reduce the settlement of single pile when the elastic parameters of different foundation and the geometrical dimensions and materials of single pile are different.
Based on the load transfer method and shear displacement method for the analysis of vertical compression behavior of single pile, the analytical expression of vertical compression stiffness of single pile in uniform foundation is derived in this paper. It is shown that the vertical compressive stiffness of single pile in uniform subsoil is the inherent mechanical property of single pile, which depends on the stiffness of pile body and the elastic parameters of soil layer around pile. The theoretical value of vertical compressive stiffness of single pile and the measured value of static load test are compared with engineering examples. The influence of pile length, pile diameter, pile material modulus, pile side soil elastic modulus, Poisson's ratio and coefficient of subgrade reaction of pile tip foundation on the vertical compressive rigidity of single pile is analyzed. The engineering measures are discussed in order to improve the vertical compressive rigidity of single pile and reduce the settlement of single pile when the elastic parameters of different foundation and the geometrical dimensions and materials of single pile are different.
引文
[1] 横山幸满. 桩结构物的计算方法和计算实例[M]. 唐业清,吴庆荪译.北京:中国铁道出版社,1984
[2] 王锡康,张新山.对桩竖向弹性刚度的讨论[J].工业建筑,2002,32(11):30-32
[3] 朱百里,沈珠江,等.计算土力学[M].上海:上海科学技术出版社,1990
[4] 潘时声.桩基础分层位移迭代法计算理论及其应用[D].上海:同济大学,1993
[5] 李靖森,王健,杨宇.桩的抗压刚度结构[J].土木工程学报,2008,41(11):99-105
[6] 刘纯康.桩的竖向刚度计算方法[J].建筑结构,1996,17(12):24-26
[7] GB 50040—1996,动力机器基础设计规范[S]
[8] 张武,张波,张少琴.基床系数静载试验取值方法与应用[J].岩土工程技术,2016,30(2):78-84
[9] 张武.竖向抗压单桩承载力实例分析[J]. 建筑科学,2008,24(1):75-79
[10] 顾晓鲁,钱鸿缙,刘惠珊,等.地基与基础(第三版)[M]. 北京:中国建筑工业出版社,2003
[2] 王锡康,张新山.对桩竖向弹性刚度的讨论[J].工业建筑,2002,32(11):30-32
[3] 朱百里,沈珠江,等.计算土力学[M].上海:上海科学技术出版社,1990
[4] 潘时声.桩基础分层位移迭代法计算理论及其应用[D].上海:同济大学,1993
[5] 李靖森,王健,杨宇.桩的抗压刚度结构[J].土木工程学报,2008,41(11):99-105
[6] 刘纯康.桩的竖向刚度计算方法[J].建筑结构,1996,17(12):24-26
[7] GB 50040—1996,动力机器基础设计规范[S]
[8] 张武,张波,张少琴.基床系数静载试验取值方法与应用[J].岩土工程技术,2016,30(2):78-84
[9] 张武.竖向抗压单桩承载力实例分析[J]. 建筑科学,2008,24(1):75-79
[10] 顾晓鲁,钱鸿缙,刘惠珊,等.地基与基础(第三版)[M]. 北京:中国建筑工业出版社,2003