吹填土地基应用CFG桩复合地基的施工与监测分析
摘要
本论文以厦门环东海域火炬工业园(通用厂房三期)2007G15-1、2地块为工程背景。该工程地质条件为东南沿海滩涂,其中的软弱层主要为吹填土层,地下水位受海水影响较大,具较强的腐蚀性。解决此类工程地质问题的主要方法是采用复合地基基础。根据工程地质报告,综合各方面因素考虑,采用了CFG桩复合地基处理,其特点有承载力高,施工方便快捷,质量易于控制,工程造价低等。
CFG桩复合地基应用于吹填土地基的施工方法有多种,该项目采用的是振冲法施工。本文详细阐述了振冲法施工工艺和步骤,振冲法施工的质量控制方法。作者在厦门环东海域火炬工业园通用厂房三期选择工点进行了CFG桩复合地基受力和沉降的长期监测。监测内容包括桩顶、桩间土压力和沉降、柱的应变。监测方法包括水准仪测量柱的沉降,利用安装在柱基础、桩顶和桩间土之间的沉降计观测桩顶和桩间土相对于基础的沉降。
监测结果表明,桩顶受力受荷载、桩型布置影响较大,桩间土受力较为平均,桩顶和桩间土的沉降满足设计要求,桩间土沉降是引起桩顶刺入褥垫层的沉降的主要原因。通过本监测活动了解了吹填土上CFG复合地基桩土受力状态和变形情况,分析了CFG桩复合地基的可行性和可靠性,为今后类似工程的设计和施工提供借鉴和指导。总体上看,CFG桩复合地基能够给上部建筑提供必要的承载力,该地基处理技术运用到环东海域吹填土地基建筑物是可行的和可靠的,在经济上也是合理的。
In this thesis, Xiamen east coastal area Torch Industrial District (general plant phase III) 2007G15-1,2 plot is the engineering background. The engineering geological condition of this project is southeast coastal beach, the weak layer of the soil is mainly dredger fill, groundwater table influenced by seawater, which is highly corrosive. To solve this engineering geological problem, a major way is adopting composite foundation. According to geological reports, taking all factors into account, the Cement Fly-ash Gravel pile composite foundation was selected, and its main characters are high bearing capacity, convenience of construction, easiness of quality control and low engineering cost, etc.
There are various construction methods of CFG pile composite foundation which is adopted for reclaimed soil foundation. This project selected the vibroflotation method to construct. The construction method of vibration technology and procedures, quality of construction method of vibration control are described in this paper. Author conducted the long-term of the force and the settlement of CFG pile composite foundation of the selected monitoring points in Xiamen east coastal area Torch Industrial District (general plant phase III). The monitor included the earth pressure and settlement of pile top, soil between piles and column strain. The methods of monitor included level measurement for settlement of the piles, the settlement gauge set on the pile foundation, pile top and soil between piles for the settlement of pile top and soil between piles.
The monitoring results show that, the force of the pile top influenced by the load and the arrangement of the piles, soil between piles force received more evenly. The settlement of the pile top and soil between piles meet the design requirements. The settlement of the soil between piles is the main reason of the settlement of the pile top pierce into the cushion. Through the monitoring results, we understand the soil stress state and deformation on CFG pile composite foundation, discriminated the feasibility and reliability of CFG pile composite foundation, provide reference and guidance for the similar projects in future design and construction. Overall, the result indicated that CFG pile could provide necessary bearing capacity to the upper structure, and it is feasible, reliable and economical to use this treatment measures on reclaimed soil foundation.
CFG桩复合地基应用于吹填土地基的施工方法有多种,该项目采用的是振冲法施工。本文详细阐述了振冲法施工工艺和步骤,振冲法施工的质量控制方法。作者在厦门环东海域火炬工业园通用厂房三期选择工点进行了CFG桩复合地基受力和沉降的长期监测。监测内容包括桩顶、桩间土压力和沉降、柱的应变。监测方法包括水准仪测量柱的沉降,利用安装在柱基础、桩顶和桩间土之间的沉降计观测桩顶和桩间土相对于基础的沉降。
监测结果表明,桩顶受力受荷载、桩型布置影响较大,桩间土受力较为平均,桩顶和桩间土的沉降满足设计要求,桩间土沉降是引起桩顶刺入褥垫层的沉降的主要原因。通过本监测活动了解了吹填土上CFG复合地基桩土受力状态和变形情况,分析了CFG桩复合地基的可行性和可靠性,为今后类似工程的设计和施工提供借鉴和指导。总体上看,CFG桩复合地基能够给上部建筑提供必要的承载力,该地基处理技术运用到环东海域吹填土地基建筑物是可行的和可靠的,在经济上也是合理的。
In this thesis, Xiamen east coastal area Torch Industrial District (general plant phase III) 2007G15-1,2 plot is the engineering background. The engineering geological condition of this project is southeast coastal beach, the weak layer of the soil is mainly dredger fill, groundwater table influenced by seawater, which is highly corrosive. To solve this engineering geological problem, a major way is adopting composite foundation. According to geological reports, taking all factors into account, the Cement Fly-ash Gravel pile composite foundation was selected, and its main characters are high bearing capacity, convenience of construction, easiness of quality control and low engineering cost, etc.
There are various construction methods of CFG pile composite foundation which is adopted for reclaimed soil foundation. This project selected the vibroflotation method to construct. The construction method of vibration technology and procedures, quality of construction method of vibration control are described in this paper. Author conducted the long-term of the force and the settlement of CFG pile composite foundation of the selected monitoring points in Xiamen east coastal area Torch Industrial District (general plant phase III). The monitor included the earth pressure and settlement of pile top, soil between piles and column strain. The methods of monitor included level measurement for settlement of the piles, the settlement gauge set on the pile foundation, pile top and soil between piles for the settlement of pile top and soil between piles.
The monitoring results show that, the force of the pile top influenced by the load and the arrangement of the piles, soil between piles force received more evenly. The settlement of the pile top and soil between piles meet the design requirements. The settlement of the soil between piles is the main reason of the settlement of the pile top pierce into the cushion. Through the monitoring results, we understand the soil stress state and deformation on CFG pile composite foundation, discriminated the feasibility and reliability of CFG pile composite foundation, provide reference and guidance for the similar projects in future design and construction. Overall, the result indicated that CFG pile could provide necessary bearing capacity to the upper structure, and it is feasible, reliable and economical to use this treatment measures on reclaimed soil foundation.
引文
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[28]娄国充.CFG桩复合地基设计及现场试验分析.铁道标准设计.2002,(2).
[29]刘希亮,罗静,马文定,赵光思.高应力下土与结构接触面剪切特性的试验研究.焦作工学院学报(自然科学版).2001,20(2).
[30]殷宗泽.裂隙对膨胀土强度影响的试验研究[J].水利水电技术.2010,41(9).
[31]张冬霁.接触面薄层单元的研究及其应用[J].河海大学.1997.
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[34]秦建庆,杨文龙.水泥土桩复合地基桩土应力比的量测与研究.中国土木工程学会第五届地基处理学术讨论会论文集.1997.
[35]郑俊杰,黄海松.水泥土桩复合地基桩土应力比的解析算法[J].岩土力学.2005,26(9).
[36]张良.CFG桩在地基处理中的应用.探矿工程-岩土钻掘工程.2003,(2).
[37]田小春,胡亚龙.CFG桩复合地基作用原理及设计[J].山西建筑.2007,33(15).
[38]宿英安.简介软土地基处理的几种方法.城市建设与商业网点.2009,(12).
[39]于孟秋,赵琳琳.浅谈振冲法施工工艺及其质量控制.水利科技与经济.2009,15(8).
[2]《建筑地基处理技术规范》,中国建筑工业出版社,2002.北京
[3]康景文.夯扩载体CFG桩承载力性状分析[D].建筑科学,2010.
[4]范伟霞,周建,于亚南,刘克萍.CFG桩复合地基承载力公式β参数取值分析[J].工业建筑.2006,36(3).
[5]《建筑地基基础设计规范》,中国建筑工业出版社,2002.北京
[6]杨素春.CFG桩桩土应力比及褥垫层厚度研究.工业建筑[J].2004,34(6)
[7]王明山,王广驰,闫雪峰,佟建兴,闫明礼.多桩型复合地基承载性状研究.岩土工程学报[J].2005,27(10).
[8]董道洋.CFG桩复合地基褥垫层设计的重要性.岩土工程界.2004,7(1).
[9]贾瑞杰,隆威,於法明.CFG桩复合地基褥垫层的合理厚度确定方法研究.探矿工程-岩土钻掘工程.2006,33(4).
[10]张建伟,戴自航.CFG桩复合地基褥垫层效用的有限元分析[J].岩土力学.2005.
[11]詹云刚.CFG桩复合地基褥垫层工作性状研究.探矿工程-岩土钻掘工程.2004,31(8).
[12]代宝刚,乔丽平.深圳地区CFG桩复合地基设计中两个问题的讨论.西部探矿工程.2007,19(7)
[13]陈东佐,梁仁旺.水泥土桩及CFG桩复合地基问题的探讨[J].太原理工大学学报.2003,34(3).
[14]陈昌仁.CFG桩复合地基承载力经验公式的修正及应用.河海大学学报[J].2006,34(3)
[15]张尚东,娄国充,刘俊彦.CFG桩复合地基特性分析及承载计算[J].石家庄铁道学院学报.2000,13(Z1)
[16]胡长明,王建平,吕江新.CFG桩复合地基承载力影响因素分析.施工技术.2005,34(9).
[17]张小敏,郑俊杰.CFG桩复合地基承载力可靠度分析[J].岩土力学.2002,23(6).
[18]潘星,何仕英.刚性桩复合地基设计计算探讨.工程建设与档案.2005,19(1).
[19]白翔宇.CFG桩复合地基变形特性及影响因素[J].平原大学学报.2006,23(2).
[20]董必昌,郑俊杰.CFG桩复合地基沉降计算方法研究[J].岩土力学与工程学报.2002,21(7).
[21]王瑞芳,雷学文.CFG桩复合地基沉降数值分析[J].建筑科学.2003,19(2).
[22]王建锋,陶俊杰,周晖.CFG桩复合地基有限元分析[J].山西建筑.2006,32(14).
[23]裴冬忙,唐彤芝,汪拾金.CFG桩复合地基加固高速公路深厚软基若干问题研究.探矿工程-岩土钻掘工程.2006,33(2).
[24]纪淑鹏,唐彤芝,詹云刚.CFG桩复合地基固结规律研究[J].路基工程.2006,(4).
[25]贺武斌,梁仁旺,王奎华.关于半刚性桩复合地基若干问题的研究[J].水利学报.2003,(5).
[26]易发成,李少和,于远忠,王殿刚.CFG桩复合地基负摩阻力的几个问题.建筑技术.2006,37(3).
[27]唐彤芝,詹云刚,裴冬芒.CFG桩加固软基复合地基桩间距设计计算方法[J].公路交通科技.2005,22(3).
[28]娄国充.CFG桩复合地基设计及现场试验分析.铁道标准设计.2002,(2).
[29]刘希亮,罗静,马文定,赵光思.高应力下土与结构接触面剪切特性的试验研究.焦作工学院学报(自然科学版).2001,20(2).
[30]殷宗泽.裂隙对膨胀土强度影响的试验研究[J].水利水电技术.2010,41(9).
[31]张冬霁.接触面薄层单元的研究及其应用[J].河海大学.1997.
[32]卢廷浩.接触面薄层单元耦合本构模型[J].水利学报.2000,(2).
[33]秦然,陈征宙,董平.水泥土桩复合地基桩土应力比的一种解析算法.岩土力学.2001,22(1).
[34]秦建庆,杨文龙.水泥土桩复合地基桩土应力比的量测与研究.中国土木工程学会第五届地基处理学术讨论会论文集.1997.
[35]郑俊杰,黄海松.水泥土桩复合地基桩土应力比的解析算法[J].岩土力学.2005,26(9).
[36]张良.CFG桩在地基处理中的应用.探矿工程-岩土钻掘工程.2003,(2).
[37]田小春,胡亚龙.CFG桩复合地基作用原理及设计[J].山西建筑.2007,33(15).
[38]宿英安.简介软土地基处理的几种方法.城市建设与商业网点.2009,(12).
[39]于孟秋,赵琳琳.浅谈振冲法施工工艺及其质量控制.水利科技与经济.2009,15(8).