挤密碎石桩成孔器的桩端应力分析
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摘要
以南水北调中线一期总干渠潮河段第六施工标段为例,针对工程实际当中遇到夹层或砂层较密时,挤密碎石桩施工进展缓慢甚至成孔器无法穿透的问题,提出了用圆锥形桩端代替现用的圆形平板桩端的措施,并用FLAC3D进行了数值模拟,得出了不同桩端模型的应力分布图.通过对2种不同形状的成孔器桩端的应力大小和分布图的对比分析,认为圆锥形成孔器桩端的应力数值较大且集中于桩端中心部位,穿透能力大大超过圆形平板式桩端;圆锥形桩端的成孔器自身应力较小,不易被压变形,验证了圆锥形桩端的优越性和实际工程价值.
Taking the sixth bid section of Chaohe river section of main canal in the middle route of South-to-north Water Transfer Project for an example,aiming at the problem of which the construction progress of gravel compaction plies is slow even the pore-forming device can't penetrate when encountering interbeds or dense sand layers in actual engineering,the measure that the conical pile tip takes the place of the current round plate one is proposed.Then FLAC3D is used for numerical simulations,and the stress distributions of different pile tip models are obtained.By comparing and analyzing the stress distributions of two different pore-forming devices,it is showed that the stress of the conical pile tip is greater and focuses on the center of the pile tip,and its penetrability is much higher than the round plate pile tip as well as the stress of the conical pile tip itself is so less that it can't be easily crushed,which verify the superiority and the actual project value of conical pile tips.
Taking the sixth bid section of Chaohe river section of main canal in the middle route of South-to-north Water Transfer Project for an example,aiming at the problem of which the construction progress of gravel compaction plies is slow even the pore-forming device can't penetrate when encountering interbeds or dense sand layers in actual engineering,the measure that the conical pile tip takes the place of the current round plate one is proposed.Then FLAC3D is used for numerical simulations,and the stress distributions of different pile tip models are obtained.By comparing and analyzing the stress distributions of two different pore-forming devices,it is showed that the stress of the conical pile tip is greater and focuses on the center of the pile tip,and its penetrability is much higher than the round plate pile tip as well as the stress of the conical pile tip itself is so less that it can't be easily crushed,which verify the superiority and the actual project value of conical pile tips.
引文
[1]孙文怀.基础工程设计与地基处理[M].北京:中国建筑工业出版社,1999.
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[4]水利部水利电力规划设计总院,长江水利委员会长江勘测规划设计研究院.GB50487—2008水利水电工程地质勘察规范[S].北京:中国计划出版社,2008.
[5]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[2]林宗元.岩土工程治理手册[M].北京:中国建筑工业出版社,2005.
[3]中国地震局分析预报中心.南水北调中线工程沿线设计地震动参数区划报告[R].北京:中国地震局分析预报中心,2009.
[4]水利部水利电力规划设计总院,长江水利委员会长江勘测规划设计研究院.GB50487—2008水利水电工程地质勘察规范[S].北京:中国计划出版社,2008.
[5]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
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