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叶巴滩水电站拱坝坝肩深部卸荷带影响研究
引用本文:张文,陈媛,张林,杨宝全,张冲. 叶巴滩水电站拱坝坝肩深部卸荷带影响研究[J]. 地下空间与工程学报, 2019, 15(1): 134-141
作者姓名:张文  陈媛  张林  杨宝全  张冲
作者单位:四川大学水力学与山区河流开发保护国家重点实验室水利水电学院;中国电建集团成都勘测设计研究院有限公司
基金项目:国家重点研发计划(2016YFC0401908);国家自然科学基金(51609163)
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。

关 键 词:叶巴滩拱坝  深部卸荷带  地质力学模型  超载法试验  工作性态  
收稿时间:2018-08-18

Study on Effect of Deep Unloading Zone in Abutment of Yebatan Hydropower Station
Zhang Wen,Chen Yuan,Zhang Lin,Yang Baoquan,Zhang Chong. Study on Effect of Deep Unloading Zone in Abutment of Yebatan Hydropower Station[J]. Chinese Journal of Underground Space and Engineering, 2019, 15(1): 134-141
Authors:Zhang Wen  Chen Yuan  Zhang Lin  Yang Baoquan  Zhang Chong
Abstract: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 IVs and the combination with faults near the arch abutment. The strongly relaxed rock mass IVs in 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.
Keywords:Yebatan arch dam  deep unloading zone  geomechanical model  overloading method test  working performance  
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