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1、水泥搅拌桩试验桩施工方案PileTestConstructionPlanofCementMixingPile一、原理I.PrincipleandTheory水泥搅拌桩是利用水泥作为固化剂的主剂，通过搅拌桩机将水泥喷入土体并充分搅拌，水泥与土发生一系列物理化学反应，使软土硬结而提高路基强度。水泥搅拌桩是软基处理常见的有效方法。Cementmixingpile,aneffectivewaytosofttreatment,whichadoptscementasthemainhostofcuringagent,insertceme
2、ntintosoilbodythroughmixingpilemachine,toimprovethestrengthandintensionofsubgradeinthesourceofsoftsoilhardeningbyaseriousphysicalandchemicalreaction.二、试验段里程Sectionsoftest确定试验段里程为DK12+773～DK12+833。ItwasconfirmedthatthetestsectionfromDK12+773-DK12+833.三、工程概况Thebrief
3、conditionofprojectDK12+673～DK12+833段软土路基分布在丘间谷地中，该段地形平坦，表层主要为流塑-软塑状黏土，灰色、灰黑色，含有机质，土质不均，含少量细砂颗粒；下伏可塑—硬塑状砂黏土。采用水泥土搅拌桩复合地基加固，桩径0.5m。DK12+673-DK12+833locatedinvalleybetweenhills,softsubgrade,withplatandsmoothlandform,thetopsoilisgrayandgray-blackfluidplasticclay,conta
4、iningorganicmaterialsandfewfinesanddust,underlyingwaxyandhardplasticsandclay.Adoptingcementmixingpiletohardenfoundation,dimensionofpileis0.5m.四、设计参数Designationparameter.1、试验桩位置：DK12+803～DK12+833。Locationoftestpile:DK12+803-DK12+833.2、桩长：根据设计图纸确定为5m。Lengthofpile:5m
5、asindicatedindrawing.3、桩径：Ф500mm；桩底穿透软土至硬底层不小于1.0m。Dimensionofpile:Ф500mm；pilebottomthroughsoftsoiltohardbottomasleast1.0m.4、水泥掺入量：按室内配合比进行试桩，水泥用量在35kg/m、40kg/m、45kg/m、50kg/m、55kg/m中进行比选，进行室内配合比试验，每种配合比现场施工试桩2根。Insertquantityofcement:accordingtoindoorratiototestpi
6、le,thequantityofcementcomparisonandselectionfrom35kg/m,40kg/m,45kg/m,50kg/m,55kg/m,toperformindoormixratiotest,2pilesneedtobeperformedforeverymixratio.5、无侧限抗压强度值：28d无侧限抗压强度值不小于1.2Mpa。Nonlateralconfinementpressureresistancevalue:thenonlateralconfinementpressureresi
7、stancepressure(28d)shouldhigherthan1.2Mpa.6、搅拌桩复合地基承载力：符合设计要求。Loadofmixingpilecompositefoundation:asperthedesignationrequirements.五、试桩目的Targetofpiletest.通过试验桩研究桩体水泥土强度与龄期的关系，找出最佳的水泥用量、水泥浆的水灰比、搅拌次数、喷浆次数；确定泵送压力、搅拌机提升速度、下钻速度和复搅深度等技术和工艺参数。试桩结束后及时整理资料，形成试验桩总结报告，报请业主工程师
8、审批，以便指导水泥搅拌桩的施工。Tofindouttheoptimalcementcontent,watercementratioofcementpast,mixingandgunitingtimes,andconfirmthepumpingpressure,liftingspeedofmixer,sp
