叶巴滩水电站拱坝坝肩深部卸荷带影响研究
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摘要
针对叶巴滩拱坝左右坝肩内存在的深部卸荷带等不良地质缺陷,采用地质力学模型试验超载法,对叶巴滩2 750 m高程拱坝和坝肩的工作性态开展平面地质力学模型试验研究。通过试验获得拱坝、坝肩及深部卸荷带的变形特性和破坏形态,探明了深部卸荷带对拱坝和坝肩的工作性态的影响,揭示了工程的薄弱部位。研究表明深部卸荷带对拱坝和坝肩的工作性态有明显影响,其影响程度与强松弛IVs类岩体所处位置及与拱端附近断层的组合作用有关。位于左坝肩强松弛IVs类岩体对拱坝和坝肩的变位、拱推力的传递影响较大,位于右坝肩的断层f29(f74)对坝肩稳定有明显影响。对左右坝肩内的这些薄弱部位需采取相应的加固措施,以改善拱坝和坝肩的工作性态。
According to the adverse geological defects such as deep unloading zone in both abutments of the Yebatan arch dam,the plane geomechanical model test based on the overloading method was conducted to research the working performance of the arch dam and abutment at EL. 2 750 m. The deformation characteristics and failure patterns of the arch dam,abutment and deep unloading zone were obtained by the test. In addition,the effect degree of the deep unloading zone on the working performance of dam and abutment was studied. The weak parts of the project were revealed as well. The deep unloading zone has an evident impact on the working performance of dam and abutment. The effect degree is related to the position of the strongly relaxed rock mass IVsand the combination with faults near the arch abutment. The strongly relaxed rock mass IVsin the left abutment has a great effect on the deformation of the arch dam and abutment and the transmission of arch thrust. The stability of right abutment is affected by the fault f29( f74). Some reinforcement measures should be adopted to treat these weak parts in the left and right abutment to improve the working performance of the arch dam and abutment.
According to the adverse geological defects such as deep unloading zone in both abutments of the Yebatan arch dam,the plane geomechanical model test based on the overloading method was conducted to research the working performance of the arch dam and abutment at EL. 2 750 m. The deformation characteristics and failure patterns of the arch dam,abutment and deep unloading zone were obtained by the test. In addition,the effect degree of the deep unloading zone on the working performance of dam and abutment was studied. The weak parts of the project were revealed as well. The deep unloading zone has an evident impact on the working performance of dam and abutment. The effect degree is related to the position of the strongly relaxed rock mass IVsand the combination with faults near the arch abutment. The strongly relaxed rock mass IVsin the left abutment has a great effect on the deformation of the arch dam and abutment and the transmission of arch thrust. The stability of right abutment is affected by the fault f29( f74). Some reinforcement measures should be adopted to treat these weak parts in the left and right abutment to improve the working performance of the arch dam and abutment.
引文
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[17]李聪,朱杰兵,汪斌,等.顺层边坡不同开挖锚固过程力学响应模型试验[J].地下空间与工程学报,2017,13(1):271-278.(Li Cong,Zhu Jiebing,Wang Bin,et al.Model tests for mechanical respond of bedding rock during different excavation and anchoring process[J].Chinese Journal of Underground Space and Engineering,2017,13(1):271-278.(in Chinese))
[2]陈林,潘燕芳,刘小强.叶巴滩高拱坝抗震安全分析与评价[J].地下空间与工程学报,2018,14(6):1667-1675.(Chen Lin,Pan Yanfang,Liu Xiaoping.Seismic safety analysis and evaluation of yeba beach high arch dam[J].Chinese Journal of Underground Space and Engineering,2018,14(6):1667-1675.(in Chinese))
[3]蔡斌,徐敬武,朱可俊.坝基岩体开挖卸荷松弛效应工程特性研究[J].地下空间与工程学报,2018,14(5):1313-1321.(Cai Bin,Xu Jingwu,Zhu Kejun.Study on characteristics and engineering properties of in a dam hydropower station[J].Chinese Journal of Underground Space and Engineering,2018,14(5):1313-1321.(in Chinese))
[4]刘恋嘉,赵其华,韩刚.叶巴滩水电站坝址区深部变形破裂特征[J].岩土工程学报,2017,39(3):501-508.(Liu Lianjia,Zhao Qihua,Han Gang.Characteristics of deep-seated crack in dam site of Yebatan Hydropower Station[J].Chinese Journal of Geotechnical Engineering,2017,39(3):501-508.(in Chinese))
[5]荣冠,朱焕春,王思敬.锦屏一级水电站左岸边坡深部裂缝成因初探[J].岩石力学与工程学报,2008,27(增1):2855-2863.(Rong Guan,Zhu Huanchun,Wang Sijing.Primary research on mechanism of deep fractures formation in left bank of Jinping first stage hydropower station[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Supp.1):2855-2863.(in Chinese))
[6]徐湘涛.金沙江白鹤滩水电站高边坡岩体力学特性及其稳定性研究[D].成都:成都理工大学,2012.(Xu Xiangtao.Research on rock mass mechanical characteristics and stability of high slope of baihetan hydropower station[D].Chengdu:Chengdu University of Technology,2012.(in Chinese))
[7]杨金旺,陈媛,张林,等.基于地质力学模型试验综合法的顺层岩质高边坡稳定性研究[J].岩石力学与工程学报,2018,37(1):131-140.(Yang Jinwang,Chen Yuan,Zhang Lin,et al.Stability of high bedding slope of rock based on comprehensive geo-mechanical model test[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(1):131-140.(in Chinese))
[8]李璐,陈秀铜.大型地下洞室群稳定性地质力学模型试验研究[J].地下空间与工程学报,2016,12(增2):510-517.(Li Lu,Chen Xiutong.Experimental study on the stability of large underground cavern group by geo-mechanical model[J].Chinese Journal of Underground Space and Engineering,2016,12(Supp.2):510-517.(in Chinese))
[9]董建华,张林,徐远飞,等.突变理论在地质力学模型试验失稳判据中的应用[J].四川大学学报(工程科学版),2017,49(4):18-25.(Dong Jianhua,Zhang Lin,Xu Yuanfei,et al.Application of catastrophe theory to determine the instability criterion for geo-mechanical model tests[J].Advanced Engineering Sciences,2017,49(4):18-25.(in Chinese))
[10]肖诗荣,刘德富,姜福兴,等.三峡库区千将坪滑坡地质力学模型试验研究[J].岩石力学与工程学报,2010,29(5):1023-1030.(Xiao Shirong,Liu Defu,Jiang Fuxing,et al.Geomechanical model experiment on Qianjiangping landslide in three gorges reservoir area[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(5):1023-1030.(in Chinese))
[11]张泷,刘耀儒,杨强,等.基于地质力学模型试验的大岗山拱坝整体稳定性分析[J].岩石力学与工程学报,2014,33(5):971-982.(Zhang Long,Liu Yaoru,Yang Qiang,et al.Geomechanical model tests on global stability of an arch dam at Dagangshan[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(5):971-982.(in Chinese))
[12]Chen Y,Zhang L,Yang B Q,et al.Geomechanical model test on dam stability and application to Jinping high arch dam[J].International Journal of Rock Mechanics and Mining Sciences,2015,76:1-9.
[13]庞明亮,胡筱,尤林,等.雅砻江孟底沟水电站拱坝拱座抗滑稳定研究[J].地下空间与工程学报,2017,13(6):1678-1687.(Pang Mingliang,Hu Xiao,You Lin,et al.Study on arch dam abutment stability of mengdigou hydropower station[J].Chinese Journal of Underground Space and Engineering,2017,13(6):1678-1687.(in Chinese))
[14]He Z,Liu Y R,Pan Y W,et al.Evaluating the safety of high arch dams with fractures based on numerical simulation and geomechanical model testing[J].Science China(Technological Sciences),2015,58(10):1648-1659.
[15]Yang B Q,Zhang L,Liu E L,et al.Deformation monitoring of geomechanical model test and its application in overall stability analysis of a high arch dam[J].Journal of Sensors,2015,2015(5):1-12.
[16]蔡睿堃,张林,胡成秋,等.含不同倾角结构面的重力坝坝基深层抗滑稳定研究[J].工程科学与技术,2017,49(增2):51-55.(Cai Ruikun,Zhang Lin,Hu Chengqiu,et al.Study on deep anti-sliding stability of gravity dam foundation with different inclined structural planes[J].Advanced Engineering Sciences,2017,49(Supp.2):51-55.(in Chinese))
[17]李聪,朱杰兵,汪斌,等.顺层边坡不同开挖锚固过程力学响应模型试验[J].地下空间与工程学报,2017,13(1):271-278.(Li Cong,Zhu Jiebing,Wang Bin,et al.Model tests for mechanical respond of bedding rock during different excavation and anchoring process[J].Chinese Journal of Underground Space and Engineering,2017,13(1):271-278.(in Chinese))