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1、第30卷第2期公路交通科技v。1.30N。.22013年2月JournalofHighwayandTransportationResearchandDevelopmentFeb.2013============================—==—========doi:10.3969/j.issrl.1002-0268.2013.02.014深埋高水位同/J\1衛(wèi)山嶺隧道支護(hù)與襯砌外水壓力分析信春雷1,高波1,李蒼松2(1.西南交通大學(xué)交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室,四川成都6100312.中鐵西南科學(xué)研究院有限公司,四川成都610031)摘要:為
2、保護(hù)環(huán)境并盡可能降低隧道襯砌結(jié)構(gòu)所承受的水壓力,深埋高水位山嶺隧道一般采取堵水限排的設(shè)計(jì)原則。在隧道力學(xué)和滲流力學(xué)的基礎(chǔ)上進(jìn)行數(shù)值分析和模型試驗(yàn),研究滲流應(yīng)力耦合作用下支護(hù)和襯砌的力學(xué)特性。研究結(jié)果表明:對(duì)于受排水影響明顯的山嶺隧道,作用于初期支護(hù)上的水壓力不會(huì)隨排水條件的改變而發(fā)生顯著變化。當(dāng)排水通道從圍巖與初期支護(hù)的界面轉(zhuǎn)變?yōu)槌跗谥ёo(hù)與二次襯砌的界面后,會(huì)導(dǎo)致孔隙水壓力從初期支護(hù)向二次襯砌轉(zhuǎn)移,初期支護(hù)產(chǎn)生卸栽并朝向圍巖變形。隧道有效排水時(shí),二次襯砌承受的水壓力可忽略。隨著排水系統(tǒng)退化導(dǎo)致排水受阻時(shí),地下水流梯度逐漸下降,有效徑向應(yīng)力逐漸下降,朝
3、向隧道的徑向流量減少,且圍巖變形減小,二次襯砌上的水壓力增大。本研究為深埋高水位山嶺隧道的初期支護(hù)和二次襯砌的初步設(shè)計(jì)提供了一個(gè)合理的方法,并有助于確定地面、水和支護(hù)間的荷栽傳輸機(jī)制。關(guān)鍵詞:隧道工程;襯砌水壓力;模型試驗(yàn);排水模式:相對(duì)剛度法中圖分類號(hào):U45l+.4文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—0268(2013)02—0077—06AnalysisofExternalWaterPressure0nSupportandLiningofDeepMountainTunnelsbelowHighWaterTableXINChunleil,GAOB0
4、1,LICangson92(1.KeyLaboratoryofTransportTunnelEngineeringofMOE,SouthwestJiaotongUniversity,ChengduSiehuan610031,China;2.ChinaRailwaySouthwestResearchInstitute,ChengduSiehuan610031,China)Abstract:Toprotecttheenvironmentandreducethewaterpressureontunnelliningasfaraspossible,theco
5、ntrolleddrainagedesignprincipleisgenerallyadoptedindeepmountaintunnelsbelowhighwatertable.Themechanicalcharacteroftunnelsupportsandhningsundercouplingofseepageandstressarestudiedbyusingnumericalmethodandmodeltestbasedontunnelmechanicsandseepagemechanics.Theresultshowsthat(1)the
6、waterpressureontheprimarysuppoflswillnotchangenotablywhendrainageconditionsaletransformedeventhoughthemountaintunnelsaleimpactedbydrainageconditions;(2)theporewaterpressureonprimarysupportswoulddiverttotunnelliningswhenthedrainagechannelstransferredfromtheinterfacebetweenrockma
7、ssandprimarysuppoastotheinterfacebetweenprimarysuppoItsandsecondarylinings,andthepfimarysupportswouldbeunloadedandmovesoutwardstorockmass;(3)thewaterpressureontunnelliningscouldbeneglectedwhenthegroundwatercouldbedischargedsmoothly;(4)theundergroundflowgradientwouldbedecrease,t
8、heeffectiveradialstresswouldbedecrease,theradialflowto