MiniLecture9章水文地质试验原理及应用.pptx

1、HydrogeologicaltestandapplicationPumpingTest水文地质试验及应用技术中心：章李坚技术中心：章李坚目 录contents1234水文地质试验简介hydrogeological test Introduction抽水试验操作Pumping test operation抽水试验介绍pumping test Introduction相关案例cases1、水文地质试验简介压水抽水注水渗水pressurewatertestWaterinjectiontestWaterseepagetestGroundwatervelocitytestGroundwaterdisp

2、ersiontestPumpingtesthydrogeological test pressurewatertestPumpingtestWaterinjectiontestWaterseepagetest2、抽水试验介绍2.1抽水试验目的及应用范围抽水试验目的及应用范围试验目的 test purposev记录涌水量，评价含水层富水性，计算最大涌水量、单位涌水量；vRecord the water inflow,evaluate the water yield of the aquifer,and calculate the maximum water inflow and unit wat

3、er inflow;v确定含水层水文地质参数，主要为渗透系数，其余参数有给水度、导水系数等；vDetermine the hydrogeological parameters of the aquifer,mainly the permeability coefficient,and the other parameters include water yield,hydraulic conductivity,etc;v确定抽水影响半径、降落漏斗的形态等；vDetermine the influence radius of pumping and the shape of falling fu

4、nnel;v分析地下水与地表水之间的水力联系关系（补给来源）。vAnalyze the hydraulic connection between groundwater and surface water(supply source).应用范围 application scopeSimplepumpingSingleholepumpingPumpingtestwithobservationholeRoughlyestimatethepermeabilitycoefficientoftheaquitardPreliminarydeterminationofpermeabilityparamete

5、rsofaquiferMoreaccuratedeterminationofvariousparametersofaquifer2、抽水试验介绍2.2抽水试验类型抽水试验类型潜水潜水完整井完整井承承压压水完水完整井整井非完整井非完整井TypeofpumpingtestWellnumbersWelltypeSeepagetheoryAquifertypePumpingsequenceSingleholepumpingtestPorouspumpingtestInterferencewellgrouppumpingtestCompletewellpumpingtestIncompletewellp

6、umpingtestSteadyflowpumpingtestUnsteadyflowpumpingtestStratifiedpumpingtestSectionalpumpingtestMixedpumpingtestPhreaticaquiferConfinedaquiferForwardpumpingtestReversepumpingtestPhreaticaquiferConfinedaquiferImpermeable surfaceImpermeable surface完整井完整井2、抽水试验介绍v潜水 phreatic aquifer单孔完整井：Single hole com

7、plete well 多孔完整井multihole complete well：承压水 Confined aquifer单孔完整井：多孔完整井：基本假定及基础理论Basic assumptions and theories2.3抽水试验原理抽水试验原理裘布依公式裘布依公式Jobouy formula公式潜水潜水层2、抽水试验介绍潜水井原理公式推导Principleformuladerivation2.3抽水试验原理抽水试验原理裘布依公式裘布依公式3、抽水试验操作v根据场地影响含水层的数量，确定抽水孔的数量；v根据场地含水层的厚度大小，决定完整孔或非完整孔；v一般采用稳定流计算模型，以多孔抽水试

8、验为主（相对较准确）。布置原则Layout principle3.1布置要求布置要求Layoutrequirements相关要求Determinethenumberofdrainageholesaccordingtothenumberofaquifersaffectedbythesite;Determinethecompleteholeorincompleteholeaccordingtothethicknessofthesiteaquifer;Generally,thesteadyflowcalculationmodelisadopted,mainlytheporouspumpingtest

9、(relativelyaccurate)Theradiusofthepumpinghole 0.01(isthethicknessoftheaquifer),multiholepumpinggenerallyhasonepumpingholewithtwoobservationholes,andthespacingshouldbe12M;Thegeneralpumpingprocessisdividedintothreedropsandrises,andtheflowandwaterlevelvaluesareobservedandrecordedrespectively.Themaximum

10、dropandriseisclosetothedesigndynamicwaterlevel;Differentcalculationformulasneedtobeselectedfordifferentboundaryconditions,suchasJilinskiandBabushkin.3、抽水试验操作3.2现场操作流程现场操作流程准准备备工作工作钻进钻进成孔成孔下管下管洗孔洗孔填填砾砾料料洗孔洗孔试试抽水抽水抽水抽水取水取水样样水位恢复水位恢复观测观测preparationDrillingPipeinstallionHolewashingGravelfillingHole wash

11、ingTestpumpingPumpingTestwatersamplingWaterlevelrecoveryobservation3、抽水试验操作现场整理3.3数据处理数据处理室内整理On-site treatmentIndoortreatment4、相关案例v基坑方案 开挖深度10.0m，局部11.0m，有影响土层为潜水含水层；v抽水孔类型 多孔潜水完整井（稳定流）v抽水孔信息 直径130mm（实际带两个观测孔）3次降深：3.3m，4.8m，8.2mv抽水设备 水泵、流量计、水位计 抽水孔设计4.1杭州潜水层杭州潜水层2m4mfillSandysiltSandysiltSiltysand

12、withsandySiltSiltySandMuckyclayFoundationpitschemeMultiholephreaticcompletewell(steadyflow)The excavation depth is 10.0m,and the local area is 11.0m.The affected soil layer is phreatic aquiferDiameter130mm(actuallywithtwoobservationholes)3falling:3.3m,4.8m,8.2mWaterpump,flowmeterandwaterlevelgauge4、

13、相关案例数据处理4.1杭州潜水层杭州潜水层本试验实际为多孔潜水完整井抽水，但在数据处理过程中，按多孔抽水处理，其得出的数据成果与实际不符！含含水水层抽抽水水孔孔类型型降降深深次次序序水水温温()涌涌水水量量Q（m3/d）水位降升水位降升S(m)影影响响半半径径（m）渗渗透透系系数数（cm/s）平平均均值（cm/s）主孔观1观2潜水潜水多孔完整井12076.653.300.820.61160.05.20E-039.45E-03220117.534.810.980.73165.96.76E-03320191.68.191.110.943325.671.64E-02含含水水层抽抽水水孔孔类型型降降深

14、深次次序序水水温温()涌涌水水量量Q（m3/d）水水位位降降升升S(m)影影响响半半径径（m）渗渗透透系系数数（m/d）渗渗透透系系数数（cm/s）平平均均值（cm/s）潜水潜水单孔完整井12076.653.30311.521.76E-033.39E-03220117.534.81592.572.97E-03320191.68.191374.705.44E-03Thistestisactuallyacompletewellpumpingofporousphreaticwater,butintheprocessofdataprocessing,itistreatedasporouspumping

15、,andthedataresultsobtainedarenotconsistentwiththeactual!Permeabilitycoefficientinfluencedradius4、相关案例v抽水孔类型 多孔承压含水层完整井（稳定流）v抽水孔信息 直径350mm（带两个观测孔）针对1t层粉砂层，层厚1.2m，分三次降升（6m，12m，18m）v抽水设备 空压机、三角围堰、水位计 抽水孔设计4.2宁波承压含水层宁波承压含水层TypeofpumpingholeCompletewellmultiholeconfinedaquifer(stableflow)Pumpingholeinfor

16、mation350millimeterdiameter(withtwoobservationholes)For1tlayerofsiltysand,thelayerthicknessis1.2m,anditisloweredandraisedinthreetimes(6m,12m,18m)Aircompressor,triangularcofferdam,waterlevelgaugeHydrogeologicalprofile4、相关案例数据处理4.2宁波承压含水层宁波承压含水层Permeabilitycoefficientinfluencedradiusflowfalling汇报完毕 谢 谢！