2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Lin, P

Tang, CA

Wong, RHC

Zhou, WY

PolyU Institutional Repository

ISSN 1000-0054CN 11-2223 /N　 ?????? (????? )J Tsingh ua Univ ( Sci & Tech ) ,2003? ? 43? ? 8?2003, Vo l. 43, No. 826 /361108-1111　断续节理岩石中开挖附近扰动区失稳行为的实验林　鹏1 , 　黄凯珠2 , 　唐春安 3 , 　周维垣 1( 1. ??????????? ,?? 100084; 2. ?????????????? , ? , ?? ;3. ??????????????? , ?? 110006)????: 2002-11-06????: ???????????? ( 59939190) ;?????????? ( PolyU 5050 /99E) ;???????????????: ?? ( 1972-) ,? (? ) , ?? ,???。E-mai l: celinpe@ mail. t singh ua. edu. cn?????: ??? ,?? , E-mai l: zhouw y@ tsingh ua. edu. cn?　?: 目的是用实验方法研究在一定加载条件下 ,断续节理岩体中裂纹萌生、扩展、贯通机制及开挖扰动区的破坏行为。实验试样用作者配制的模拟材料制成。利用作者设计的小型开挖系统 ,在双轴加压下 ,当轴向压力达到峰值力的75%时 ,保持径向加载和轴向加载的比值λ恒定 ,模拟开挖过程 ,并用数码摄像机全程跟踪开挖过程。 实验结果显示开挖附近断续节理滑移、贯通以及扰动区的变形决定了巷道的失稳行为和最终的破坏模式 ; 开挖过程明显影响着内部扰动区和外部压缩区的变形。 开挖后 ,内部扰动区的变形大于外部压缩区 ; 开挖后 ,继续保持λ恒定时 ,应力和变形作为时间的函数逐渐释放 ,并且造成一些节理的滑动和微破裂的相互作用 ; λ越大 ,则巷道破坏的时间越短。???: 结构实验 ; 断续节理岩体 ; 裂纹扩展 ; 失稳行为 ;裂纹贯通?????: TV 32 ?????: A????: 1000-0054( 2003) 08-1108-04Experimental study of failure behaviorof disturbed zone around an opening innon-persistent jointed rock massesLIN Peng 1, WONG Robina Hoichu2,TANG Chun 'an3 , ZHOUWeiyuan1( 1. Department of Hydraulic and Hydropower Eng ineering,Ts inghua Universi ty, Beijing 100084, China;2. Department of Civil& Structural Engineering,The HongKong Polytechnic Univers ity, HongKong, China;3. Center for Rockbursts& Induced Seismicity Research,Northeastern Univers ity, Shenyang 110006, China)Abs tract: A smal l ex cavat ing s ystem w as used to ex perim en tallyinves tig ate crack ini tiation, propagation and coales cence mechanismsand fai lu re behavior arou nd an opening in non-persi s tent jointed rockmasses wi th biaxial loading. Th e specimens were made of model lingmaterial wi th holes d ri lled to various st ress levels to simulateunderground excavation. Th e opening p rocess w as th en monitoredby a digi tal vid eo cam era. When the applied axial loading reach edab ou t 75% of th e peak axial loading , the ratio, λ, of th e lateralloading to the axial loading remained cons tan t. Th e experimen talresul ts sh ow ed th at the f inal failure behavior and modes around th eopening w ere dominated b y s liding along th e join ts , by coales cenceb etw een th e join ts and th e opening, and by the s train in thedis turbed zon e arou nd th e opening. The d eformation of th e innerdis turbed zone was g reater than that of the outer compressed zonedu ring the pos t-excavation process. Releas e of th e s t ress es du ringpos t-excavation increases th e in teraction b etw een micro-f racturesand causes pre-exis ting joint s to slip w hen λ is constant. Thespecimen fai lure s t ress d ecreased w ith increasing v alues ofλ.Key words: s t ructural experiment; non-persis tent join ted rockmass es; crack propagat ion; failure beh avio r; crackcoalescence　　?????????? ,?????????????? ,???????? ,??????????????????、??、???????。 ??????????????????????? ,???????????????? ,???????? (???、??、???、??? )???、?????????????。?????? ,???????????????????????? ,???????? ,??????????????????? ,???????????????? ,???????????。? ,???? Bo lu???????、??????????????????? [1 ] ,?? ,?????????????? ,??????????????? ,??????????????????????????。????????????????????DOI : 10. 16511 /j . cnki . qhdxxb. 2003. 08. 026????? [2～ 4 ] ,?? ,??????????????????????? ,??????????????????、?????????????????。??????????????? ,??????????????? ,??????????????????????? ; ???????? ,???????????????λ????? ,?????λ?????、????、???? ,?????????、?????????? ,???????????????????????。1　????? 1　?????1. 1　试样准备????????????? [5 ]?? ,???????????、?、????? 2 4 1 1. 15??????。 ????、?、???? 10、 10、2. 5 cm, ?????????? (?? 1)???? ,??????????? ,??????。??????? 105℃?????? 5 d, ???????? ,??????????。????????????????????????? (?? 2) , ???? B1, B2, B3????? ,? 12mm。?????????? 135°, ???????? 75°, 3??????????? 2c、 2b, ???? 12mm。????????? [2 ] ,?????????????????? ,???????? 20mm。 8???????????????????? (?? 2)。?????????????????????????????????: ???????? ,??????? 3 kN, ???? 70%～ 80%??????? ,?? ,????????? 75%?????????。? 2　??????1. 2　实验装置和测试过程?????? Wykeham Farrance W f55623?????、????、????????? (??3)。??????????????? ,????10 kN? 5 kN?????????????? ,?????????????????????????????????????。 ?????M AKITA DP4700????????? ,???????????、?????????? ,??????????。 ??????????? , DCR-TRV900E??????????????????????????、????。???????????????? UCAM-10B????? ,????????????????????。? 3　???????????? ,???????? 3 kN????? ,??????? 0. 5～ 3 kN?? ,? 0. 5 kN?? ,???????λ? ,????? 0. 002 kN /s。1109?　? ,?: 　????????????????????????????? ,????????????? ,???????????????????????? 3kN。???λ????? 2min? ,?????? ,?????????? 10min。????????????? ,????????????? ,??λ???????????。2　??????2. 1　扰动区的裂纹扩展和贯通? 4???λ= 1 /2? ,??????????????。?????????????????????? (?? 2)。?? 4??????????、??、??????????????????。??????????? 75% , ?????? ,????????? ,????????、?? ,?????????????? (? 4a, 4b )。??????? ,??????????????????? ,???????????? (? 4c, 4d)。????????? ,????????????? (?+ ? )????? (? 4e, 4f )。???????????????????????、?? ,????????????????? ,????????。?5????????????????????。? 4　λ= 1 /2?????????????? (?????????????? )? 5　???????????2. 2　扰动区的变形和破坏的演化?????????????????????? ,?? ,????????????????????????? [6 ]。??????? ,?????????????????????。? 6?????????λ( 1 /3, 1 /2, 2 /3)??? ,?????????????????????? ,?? 6?? , λ?? ,????????????????? ,? ,λ? 1 /3??? 2 /3? ,??? 1× 10- 4??? 1× 10- 3。????????????????? ,????????????????? ,???????????? (? 6? B? ) ,???? ,????????????????。 ?λ= 1 /3(?6a? C? )? ,????????????????? ,????????? ,????????????? ,?????? ,??????????????????????????? ,????????? 2 h。? λ= 1 /2? (? 6b? C? ) ,?????????????????? ,???????1110 ? ?? ?? ? (?? ?? ? ) 2003, 43( 8)??????? ,?????????? ,?????????????。????????? 20min。?λ= 2 /3? (? 6c? C? ) ,???? ,???????? ,???????????? ,????????? 17min。( A: ??? ; B: ??? ; C: ??? )? 6　??λ????????????????3　?　??????????????????????????、??????????? ,???????????????????????。????????????? λ??????? ,???????????????? ,???????????????????????。???????????????????????。??? ,???????????????。 ??? ,????λ??? ,???????????????? ,????????????????????。λ?? ,??????????。????　 (Ref erences)[1 ] Brox D, Hagedo rn H. Ex t reme d eformation and damag edu ring th e const ruction of large tun nels [ J] . Tunnel in g andUnd erground Space Technolog y , 1999, 14( 1): 23 28.[2 ] Hoek E, Brown E T. Underground Excavations in Rock[M ] . London: the Inst itution of M ining and Metallurgy,1980.[3 ] Gran J K, Senseny P E, Groeth e M A, et al. Dynamicresponse of an opening join ted rock [ J] . Int J Rock MechMin S ci , 1998, 35( 8): 1021 1035.[4 ] Sh en B, Barton N. Th e dis tu rbed zon e around tunn els injoin ted rock mass es [ J ]. Int J Rock Mech Min Sci , 1997,34( 1): 17 125.[5 ] Wong R H C, Chau K T. Crack coalescence in a rock-lik ematerial con taining tw o cracks [ J]. Int J Rock Mech MinSci , 1998, 35( 2): 147 164.[6 ] Rabcew icz L V. The new Aus trian tu nnel ling method [ J] .W ater Power , 1964, 16, 453 456; 1964, 16, 511 515;1965, 17, 19 24.[7 ] Lin P, Wong R H C. Mul ti-crack coales cence in rock-lik ematerial und er uniaxial and biaxial loading [ J] . KeyEng ineer ing Ma ter ials , 2000, 183 187: 809 814.1111?　? ,?: 　?????????????????????

Experimental study of failure behavior of disturbed zone around an opening in non-persistent jointed rock masses

Abstract

Similar works

Full text

Available Versions

PolyU Institutional Repository