ASTM D5920-2014 5414 Standard Test Method [Analytical Procedure] for Tests of Anisotropic Unconfined Aquifers by Neuman Method《用诺埃曼法各向异非承压含水层试验用标准试验方法(分析程序)》.pdf
《ASTM D5920-2014 5414 Standard Test Method [Analytical Procedure] for Tests of Anisotropic Unconfined Aquifers by Neuman Method《用诺埃曼法各向异非承压含水层试验用标准试验方法(分析程序)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5920-2014 5414 Standard Test Method [Analytical Procedure] for Tests of Anisotropic Unconfined Aquifers by Neuman Method《用诺埃曼法各向异非承压含水层试验用标准试验方法(分析程序)》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D5920 14Standard Test Method (Analytical Procedure) forTests of Anisotropic Unconfined Aquifers by NeumanMethod1This standard is issued under the fixed designation D5920; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers an analytical procedure fordetermining the transmissivity, storage coefficient,
3、specificyield, and horizontal-to-vertical hydraulic conductivity ratio ofan unconfined aquifer. It is used to analyze the drawdown ofwater levels in piezometers and partially or fully penetratingobservation wells during pumping from a control well at aconstant rate.1.2 The analytical procedure given
4、 in this test method isused in conjunction with Guide D4043 and Test MethodD4050.1.3 The valid use of the Neuman method is limited todetermination of transmissivities for aquifers in hydrogeologicsettings with reasonable correspondence to the assumptions ofthe theory.1.4 The values stated in SI unit
5、s are to be regarded asstandard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitati
6、ons prior to use.2. Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil, Rock, and ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4043 Guide for Selection of
7、Aquifer Test Method inDetermining Hydraulic Properties by Well TechniquesD4050 Test Method for (Field Procedure) for Withdrawaland Injection Well Tests for Determining Hydraulic Prop-erties of Aquifer SystemsD4105 Test Method for (Analytical Procedure) for Deter-mining Transmissivity and Storage Coe
8、fficient of Non-leaky Confined Aquifers by the Modified Theis Nonequi-librium MethodD4106 Test Method for (Analytical Procedure) for Deter-mining Transmissivity and Storage Coefficient of Non-leaky Confined Aquifers by the Theis NonequilibriumMethodD6026 Practice for Using Significant Digits in Geot
9、echnicalData3. Terminology3.1 DefinitionsFor definitions of general technical termsused within this guide, refer to Terminology D653.3.2 Symbols and Dimensions:3.2.1 b Linitial saturated thickness of the aquifer.3.2.2 d Lvertical distance between top of screen inpumping well and initial position of
10、the water table.3.2.3 dDnddimensionless d, equal to d/b.3.2.4 J0(x)zero-order Bessel function of the first kind.3.2.5 KrLT1hydraulic conductivity in the plane of theaquifer, radially from the control well.3.2.6 KZLT1hydraulic conductivity normal to the planeof the aquifer.3.2.6.1 DiscussionThe use o
11、f the symbol K for the hy-draulic conductivity is the predominant usage in groundwaterliterature by hydrogeologists, whereas, the symbol k is com-monly used for this term in soil and rock mechanics and soilscience.3.2.7 l Lvertical distance between bottom of screen incontrol well and initial positio
12、n of water table.3.2.8 lDnddimensionless l, equal to l/b.3.2.9 QL3T1discharge rate.3.2.10 r Lradial distance from control well.3.2.11 s Ldrawdown.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater an
13、dVadose Zone Investigations.Current edition approved June 1, 2014. Published July 2014. Originally approvedin 1996. Last previous edition approved in 2006 as D5920-96(2006), which waswithdrawn February 2014 and reinstated in June 2014. DOI: 10.1520/D5920-14.2For referenced ASTM standards, visit the
14、ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr
15、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.12 scLcorrected drawdown.3.2.13 sDnddimensionless drawdown, equal to 4Ts/Q.3.2.14 swtLdrawdown of the water table.3.2.15 S ndstorage coefficient, equal to Ssb.3.2.16 SsL1specific storage.3.2.17 Syndspecific yield.3.2.18
16、t Ttime since pumping started.3.2.19 trTtime since recovery started.3.2.20 tsnddimensionless time with respect to Ss, equalto Tt/Sr2.3.2.21 tynddimensionless time with respect to Sy, equalto Tt/Syr2.3.2.22 tTtime, t, corresponding to intersection of ahorizontal line through the intermediate data wit
17、h an inclinedline through late data on semilogarithmic paper.3.2.23 tynddimensionless time, ty, corresponding to theintersection of a horizontal line through intermediate data withan inclined line through late data in Fig. 1.3.2.24 (t/r2)eTt/r2corresponding to the intersection of astraight line thro
18、ugh the early data with s = 0 on semilogarith-mic paper TL2.3.2.25 (t/r2)lTt/r2corresponding to the intersection of astraight line through the late data with s = 0 on semilogarith-mic paper.3.2.26 TL2T1transmissivity, Krb.3.2.27 z Lvertical distance above the bottom of theaquifer.3.2.28 z1Lvertical
19、distance of the bottom of the obser-vation well screen above the bottom of the aquifer.3.2.29 z2Lvertical distance of the top of the observationwell screen above the bottom of the aquifer.3.2.30 zDnddimensionless elevation, equal to z/b.3.2.31 z1Dnddimensionless elevation of base of screen,equal to
20、z1/b.3.2.32 z2Dnddimensionless elevation of top of screen,equal to z2/b.3.2.33 degree of anisotropy, equal to Kz/Kr.3.2.34 nddimensionless parameter r2/b2.3.2.35 seLthe difference in drawdown over one logcycle of time along a straight line through early data onsemilogarithmic paper.3.2.36 slLthe dif
21、ference in drawdown over one logcycle of time along a straight line through late data onsemilogarithmic paper.3.2.37 nddimensionless parameter S/Sy.4. Summary of Test Method4.1 ProcedureThis test method describes a procedure foranalyzing data collected during a withdrawal well test. Thistest method
22、should have been selected using Guide D4043 onthe basis of the hydrologic characteristics of the site. The fieldtest (Test Method D4050) requires pumping a control well thatis open to all or part of an unconfined aquifer at a constant ratefor a specified period and observing the drawdown in piezom-e
23、ters or observation wells that either partly or fully penetratethe aquifer. This test method may also be used to analyze aninjection test with the appropriate change in sign. The rate ofdrawdown of water levels in the aquifer is a function of thelocation and depths of screened open intervals of the
24、controlwell, observation wells, and piezometers. The drawdown maybe analyzed to determine the transmissivity, storage coefficient,FIG. 1 Aquifer-Test Analysis, Example TwoD5920 142specific yield, and ratio of vertical to horizontal hydraulicconductivity of the aquifer. The accuracy with which anypro
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