新疆大石峡面板砂砾石坝坝体分区安全性分析  

Safety Analysis of the Zoning of Dashixia Concrete Faced Sand-gravel Dam in Xinjiang

作　　者：李学强[1] 苗喆[1] 邓成进[1,2] LI Xueqiang;MIAO Zhe;DENG Chengjin(Powerchina Northwest Engineering Corporation Limited,Xi'an 710065,China;Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西安理工大学岩土工程研究所,西安710048

出　　处：《西北水电》2020年第S02期51-57,共7页Northwest Hydropower

摘　　要：新疆大石峡水利枢纽工程地形地质条件复杂,坝址区地震基本烈度高,国内国际250 m级面板砂砾石坝建设成功经验甚少。大石峡坝址区分布有丰富的符合高面板坝筑坝材料工程特性要求的砂砾料,同时坝址区微晶灰岩也是较优良的筑坝块石料。砂砾料具有变形指标较高,对坝体变形控制有利的突出优点,人工堆石料具有抗剪强度高、抗震动力指标高、渗透抗震稳定性较好的有利条件。初设阶段通过面板砂砾石坝坝体分区设计研究,综合利用2种材料的特点,推荐一种堆石料半包砂砾石料的坝体分区型式,在确保大坝变形控制的前提下,提高大坝的抗震安全性、渗透稳定性、坝顶及坝坡抗滑(剪)安全性,进而确保大坝的综合安全。Dashixia Water Control Project in Xinjiang has complex topographic and geological conditions,and the basic seismic intensity of the dam site area is high.Few 250 m-level concrete faced sand-gravel dam has been built at home and abroad.The Dashixia dam site is rich in sand and gravel materials that meet the engineering requirement of high concrete faced dam.At the same time,the microcrystalline limestone at the dam site is also a favorable dam-embankment material.Sand gravel material has the outstanding advantages of high deformation index which is beneficial to dam deformation control.Artificial rockfill material has the advantages of high shear strength,high vibration resistance index,and good permeability and seismic stability.In the preliminary design stage,through the design of the dam body partition of the concrete faced sand-gravel dam,the characteristics of the two materials are comprehensively utilized,and a dam body partition type with rockfill material half surrounding the sand-gravel material was recommended to improve the anti-seismic safety,seepage stability,dam crest and dam slope anti-sliding(shear)safety of the dam under the premise of ensuring the deformation control,hence ensuring the comprehensive safety of the dam.

关 键 词：坝体分区 变形控制 抗震安全性 渗透稳定性 

分 类 号：TV641.4[水利工程—水利水电工程]