某地下水库在不同降雨条件下非稳定渗流分析
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摘要
降雨入渗是地下水库主要来水之一,为了研究降雨对地下水库水位的影响以及分析地下水库的蓄水能力,分别以设置单道防渗地下坝的单库和多道防渗地下坝库群形式为研究对象,基于GeoStudio有限元软件中的Seep/W模块建立二维有限元模型,研究在不同降雨强度和雨型下的地下水库非稳定渗流场变化。降雨强度考虑年平均降雨量和年最大降雨量,持续时间为1年。降雨雨型考虑总降雨量为100mm的平均型、前锋型、中锋型和后锋型。计算结果表明,在不同降雨强度下单库的地下坝前上游水位增加了71.1%,下游水位增加了11.7%。库群水位变化剧烈主要集中在1号和6号储水空间,水位增加量最高分别为8.8m和12.5m,而处于中间的储水空间水位变化较平缓;单库的整体水位变化较小,而库群主要对各个储水空间的水位影响较大,对取水有利;不同降雨雨型下对单库和库群上、下游表层孔压达到最大值的时间,以及表层体积含水量所能达到的峰值有一定的影响,且在前锋型最大含水量持续时间最长。研究成果可为地下水库在降雨条件下的蓄水提供一定的参考。
Rainfall infiltration is one of the main sources of water for the underground reservoir.The influence of rainfall on the groundwater reservoir water level and the water storage capacity of the groundwater reservoir are investigated in this study with a single reservoir of single-channel anti-seepage underground dam and a reservoir group of multi-channel anti-seepage underground dam.A two-dimensional finite element model was established to estimate the unsteady seepage field of the groundwater reservoir under different rainfall intensities and different rainfall patterns,with the Seep/W module in GeoStudio finite element software.Rainfall intensity was chosen by taking into account annual average rainfall and annual maximum rainfall for a period of 1 year.Rainfall types include average type,forward type,center type and post-peak type,with a total rainfall of 100 mm.The simulation results show that the upstream water level of the single-base underground dam increased by 71.1% and the downstream water level increased by 11.7% under different rainfall intensities.The water level changes are mainly occurred in the#1 and#6 water storage spaces under multiple water storage spaces in an actual underground reservoir group,and the maximum water level changes are 8.8 mand 12.5 munder average rainfall and maximum rainfall,respectively.The water level in the middle storage space has only a minor change.The single reservoir has little changes of an overall water level.The installation of the reservoir group has a great influence on the water level for each water storage space,which might be beneficial to the water intake.Under different rainfall patterns,the pressures of the upper and lower surface pores of the single reservoir and the reservoir group reached their maximum.The peaks of the surface water content could be affected,and the maximum water content lasts the longest time with forward-type rainfall.The research results provide a reference for the groundwater reservoir to store water under different rainfall conditions.
Rainfall infiltration is one of the main sources of water for the underground reservoir.The influence of rainfall on the groundwater reservoir water level and the water storage capacity of the groundwater reservoir are investigated in this study with a single reservoir of single-channel anti-seepage underground dam and a reservoir group of multi-channel anti-seepage underground dam.A two-dimensional finite element model was established to estimate the unsteady seepage field of the groundwater reservoir under different rainfall intensities and different rainfall patterns,with the Seep/W module in GeoStudio finite element software.Rainfall intensity was chosen by taking into account annual average rainfall and annual maximum rainfall for a period of 1 year.Rainfall types include average type,forward type,center type and post-peak type,with a total rainfall of 100 mm.The simulation results show that the upstream water level of the single-base underground dam increased by 71.1% and the downstream water level increased by 11.7% under different rainfall intensities.The water level changes are mainly occurred in the#1 and#6 water storage spaces under multiple water storage spaces in an actual underground reservoir group,and the maximum water level changes are 8.8 mand 12.5 munder average rainfall and maximum rainfall,respectively.The water level in the middle storage space has only a minor change.The single reservoir has little changes of an overall water level.The installation of the reservoir group has a great influence on the water level for each water storage space,which might be beneficial to the water intake.Under different rainfall patterns,the pressures of the upper and lower surface pores of the single reservoir and the reservoir group reached their maximum.The peaks of the surface water content could be affected,and the maximum water content lasts the longest time with forward-type rainfall.The research results provide a reference for the groundwater reservoir to store water under different rainfall conditions.
引文
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[8]徐映雪,薛伟,代俊宁.大沽河地下水库调蓄功能数值模拟研究[J].中国农村水利水电,2015(4):126-129,132.(XU Y X,XUE W,DAI J N.The numerical simulation of groundwater reservoir regulation in Dagu river[J].China Rural Water and Hydropower,2015(4):126-129,132(in Chinese)).DOI:10.3969/j.issn.1007-2284.2015.04.031.
[9]杜新强,李砚阁,冶雪艳.地下水库的概念、分类和分级问题研究[J].地下空间与工程学报,2008,4(2):15-20.(DU X Q,LI Y G,YE X F.Study on concept,type and grades of groundwater reservoir[J].Chinese Journal of Underground Space and Engineering,2008,4(2):15-20.(in Chinese))DOI:10.3969/j.issn.1673-0836.2008.02.003.
[10]李柱和,祝树红,顾雪明.防渗堵漏技术在煤矿建设中的应用[J].建井技术,2000,21(1):18-20.(LI Z H,ZHU G H,GU X M.Application of anti-seepage and plugging technology in coal mine construction[J].Mine Construction Technology,2000,21(1):18-20.(in Chinese))DOI:8/j.cnki.cn11-2456/td.2000.01.006.
[11]杨亚慧,卢玉东,李鑫,等.贺兰山西麓地下水库系统分析[J].干旱区资源与环境,2017,31(9):62-67.(YANG Y H,LU Y D,LI X,et al.Analysis of groundwater reservoir system in the piedmont of the west side of Helan Mountain[J].Journal of Arid Land Resources and Environment,2017,31(9):62-67.(in Chinese))DOI:10.13448/j.cnki.jalre.2017.281.
[12]杜尚海.滹沱河地下水库人工补给效果模拟[D].长春:吉林大学,2009.(DU S H.Simulation of artificial recharge effects in Hutuo river groundwater reservoir[D].Changchun:Jilin University,2009.(in Chinese))
[13]陈末,卢文喜,侯泽宇.基于ArcGIS的潮白河地下水库三维地质建模及动态模拟[J].节水灌溉,2013(8):43-47,53.(CHEN M,LU W X,HOU Z Y.Three-dimensional Geological modeling and dynamic simulation based on ArcGIS in groundwater reservoir of Chaobai river.Water Saving Irrigation.2013(8):43-47,53.(in Chinese))
[14]MA L Q,ZHANG D S,LI X,et al.Technology of groundwater reservoir construction in goafs of shallow coalfields[J].Mining Science and Technology(China),2009,19(6):730-735.DOI:10.1016/s1674-5264(09)60133-2.
[15]ZUURBIER K G,ZAADNOORDIJK W J,STUY-FZAND P J.How multiple partially penetrating wells improve the freshwater recovery of coastal aquifer storage and recovery(ASR)systems:A field and modeling study[J].Journal of Hydrology,2014,509(4):430-441.DOI:10.1016/j.jhydrol.2013.11.057.
[16]ZHANG Y Q,WANG J H,CHEN J J,et al.Numerical study on the responses of groundwater and strata to pumping and recharge in a deep confined aquifer[J].Journal of Hydrology,2017,548:342-352.DOI:10.1016/j.jhydrol.2017.03.018.
[17]BODEUX S,PUJADES E,ORBAN P,et al.Interactions between groundwater and the cavity of an old slate mine used as lower reservoir of an UPSH(Underground Pumped Storage Hydroelectricity):A modelling approach[J].Engineering Geology,2017,217:71-80.DOI:10.1016/j.enggeo.2016.12.007.
[18]谢轶,周丹卉,张峥,等.基于GMS和ArcGIS的地下水库库容计算---以大庆西部地下水库为例[J].环境保护科学,2009,35(2):98-100.(XIE Y,ZHOU DH,ZHANG Z,et al.Underground reservoir volume calculation based on GMS and ArcGIS-Taking underground reservoir in west Daqing as an example[J].Environmental Protection Science,2009,35(2):98-100.(in Chinese))DOI:10.3969/j.issn.1004-6216.2009.02.031.
[19]刘昌军,赵华,张顺福,等.台兰河地下水库辐射井抽水过程的非稳定渗流场的有限元分析[J].吉林大学学报(地球科学版),2013,43(3):922-930.(LIU C J,ZHAO H,ZHANG S F,et al.Finite element analysis on unsteady seepage field of groundwater reservoir of Tailan River during the pumping water of the radiation well[J].Journal of Jilin University(Earth Science Edition),2013,43(3):922-930.(in Chinese))DOI:10.13278/j.cnki.jjuese.2013.03.009.
[20]刘毓氚,缪宏杰.降雨入渗条件下新型路面排水系统性能研究[J].中国公路学报,2017,30(5):1-9.(LIUY C,MAO H J.Research on performance of new pavement drainage system under rainfall infiltration[J].China Journal of Highway and Transport,2017,30(5):1-9.(in Chinese))DOI:10.3969/j.issn.1001-7372.2017.05.001.
[21]李炎隆,陈波,马成成,等.基于ABAQUS的降雨入渗条件下基坑边坡稳定性分析[J].应用力学学报,2017,34(1):155-161.(LI Y L,CHEN B,MA C C,et al.Study on the stability of the foundation pit slope under rainfall infiltration conditions based on ABAQUS[J].Chinese Journal of Applied Mechanics,2017,34(1):155-161.(in Chinese))DOI:10.11776/cjam.34.01.B084.
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