长江三峡工程蓄水对链子崖危岩体T_8—T_(12)缝段稳定性影响研究
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摘要
三峡水库蓄水后 ,已治理的链子崖危岩体 ,特别是T8—T12 缝段岩体将受到江水的长期作用和影响 ,直接关系到防治工程的成败 .通过大量实地调查和岩体测试 ,着重论述水库蓄水对T8—T12 裂缝及其充填物的作用和影响 ;并以此为基础 ,用改进的Sarma法对该段危岩体的稳定性进行重新计算和评价 ,得出一系列新的结论 :总体上 ,长江水位抬升后 ,水对裂缝的溶蚀作用和劈裂作用 ,使裂缝整体加宽 ,不利于危岩体的稳定 ;考虑岩体和承重阻滑键取长期强度和江水位骤然升降 ,以及地震影响 ,链子崖危岩体整体稳定性将恶化 ,但NE2 0°方向稳定程度好于NW 35 0° .
The controlled Lianziya hazardous rock, especially T 8-T 12 fracture segment will be affected over a long period of time when the Three Gorges reservoir stores water, which also relates to efficacy of the control project to the rock. Through mass field investigations and rock tests, this paper concerns with the long term effects of the reservoir to T 8-T 12 fracture segment and its deposits, and also recalculates the stability of the rock by using improved Sarma program. Then some new conclusions are obtained: generally, when the water level of Yangtze River rises, the water actions of erosion and tension will widen the fractures, and deteriorate the rock stability. On considering long term strengths of rock and control project, as well as rapid water rising and dropping, and also earthquake affection, the stability of hazardous rock will turn worse than before, whereas the condition in NE20° direction will be better than that in NW350°.
The controlled Lianziya hazardous rock, especially T 8-T 12 fracture segment will be affected over a long period of time when the Three Gorges reservoir stores water, which also relates to efficacy of the control project to the rock. Through mass field investigations and rock tests, this paper concerns with the long term effects of the reservoir to T 8-T 12 fracture segment and its deposits, and also recalculates the stability of the rock by using improved Sarma program. Then some new conclusions are obtained: generally, when the water level of Yangtze River rises, the water actions of erosion and tension will widen the fractures, and deteriorate the rock stability. On considering long term strengths of rock and control project, as well as rapid water rising and dropping, and also earthquake affection, the stability of hazardous rock will turn worse than before, whereas the condition in NE20° direction will be better than that in NW350°.
引文
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[2]刘世凯,宋春节,袁涛,等.长江三峡工程库区交通工程地质环境研究[J].地球科学———中国地质大学学报,2001,26(4):340-342.LIUSK ,SONGCJ ,YUANT ,etal.Researchoncom municationengineeringgeologyenvironmentintheThreeGorgesreservoirarea[J].EarthScience—JournalofChinaUniversityofGeosciences,2001,26(4):340-342.
[3]晏鄂川,唐辉明,杨裕云,等.陆浑水库坝基断层破碎带渗透稳定性评价[J].地球科学———中国地质大学学报,2001,26(1):80-92.YANEC ,TANGHM ,YANGYY ,etal.AsystemicevaluationofseepagestabilityforfracturezoneinLuhundamfoundation[J].EarthScience—JournalofChinaU niversityofGeosciences,2001,26(1):80-92.
[4]刘传正.链子崖危岩体T8—T12缝段开裂变形机制的研究[J].工程地质学报,1995,3(2):28-41.LIUCZ .StudyonmechanismoffracturedistortioninT8—T12 segmentofLianziyahazardousrock[J].Engi neeringGeologyJournal,1995,3(2):28-41.
[5]刘传正.链子崖T8—T12缝段地下水侵蚀性及工程对策[J].地质灾害与环境保护,1996,(1):7.LIUCZ .ErosionofgroundwatertoT8—T12 segmentofLianziyahazardousrockandengineeringcountermeasures[J].GeologyDisasterandEnvironmentProtection,1996,(1):7.
[6]汤连生,王思敬.水-岩化学作用对岩体变形破坏力学效应研究进展[J].地球科学进展,1999,14(5):61-69.TANGLS ,WANGSJ.Progressinthestudyonme chanicaleffectofthechemicalactionofwater rockonde formationandfailureofrock[J].AdvanceinEarthSci ences,1999,14(5):61-69.
[7]李继昌,邵圣福.武汉至十堰高速公路西段隧道围岩稳定性研究[J].地球科学———中国地质大学学报,2001,26(4):398-401.LIJC ,SHAOSF .Stabilityoftunnelwallrocksofwest ernsectionofWuhanShiyanspeedway[J].EarthScience—JournalofChinaUniversityofGeosciences,2001,26(4):398-401.
[8]方灯明.南京长江二桥南汊桥塔基主要工程地质问题与力学参数的确定[J].地球科学———中国地质大学学报,2001,26(4):406-409.FANGDM .Mainproblemsanddeterminationoffounda tionstrengthofpierofthesecondNanjingbridge[J].EarthScience—JournalofChinaUniversityofGeo sciences,2001,26(4):406-409.
[9]袁道先.“岩溶作用与碳循环”研究进展[J].地球科学进展,1999,14(5):425-431.YUANDX .Progressinthestudyonkarstprocessesandcarboncycle[J].AdvanceinEarthSciences,1999,14(5):425-431.
[10]胡亚波.链子崖危岩体深大裂缝形成机制的断裂力学研究[A].见:湖北工程地质环境地质五十年[C].武汉:中国地质大学出版社,1999.291-297.HUYB .Fracturemechanicsresearchonformmechanismofthedeep widthfissureinLianziyahazardousrock[A].In:FivedecadesofengineeringandenvironmentgeologyinHubeiProvince[C ].Wuhan:ChinaUniversityofGeosciencesPress,1999.291-297.
[11]邓清禄,王学平.黄土坡滑坡的发育历史:坠覆-滑坡-改造[J].地球科学———中国地质大学学报,2000,25(1):44-52.DENGQL ,WANGXP .GrowthhistoryofHuangtupolandslide:down slopeoverlapping landsliding modification[J].EarthScience—JournalofChinaUniversityofGeo sciences,2000,25(1):44-52.
[12]何庆芝,郦正能.工程断裂力学[M ].北京:航天航空大学出版社,1993.70-77.HEQZ ,LIZN .Engineeringfracturemechanics[M ].Beijing:UniversityofSpaceandAviationPress,1993.70-77.
[13]唐辉明.岩体断裂力学理论与工程应用[M ].武汉:中国地质大学出版社,1990.45.TANGHM .Theoryandengineeringapplicationofrockfracturemechanics[M].Wuhan:ChinaUniversityofGeo sciencesPress,1990.45.
[14]NewmanJCJr,RajuIS .Anempiricalstressintensityfactorequationforsurfacecracks[J].EngineeringFrac tureMechanics,1981,15:189-192.
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