【作者】 严伟；

【导师】 徐进；

【作者基本信息】 四川大学 ， 岩土工程， 2006， 硕士

【摘要】 在土石坝的各种坝型中,土质心墙堆石坝占有很大的比例。近几十年来,土质心墙堆石坝已逐渐成为世界上高坝建设的主流坝型之一。据20世纪90年代初统计,世界上已建和在建的坝高230m以上的高坝中,土质心墙堆石坝约占55.5%。国内自20世纪90年代以来,高土质心墙堆石坝的发展速度有所加快。在土质心墙堆石坝的设计中,起防渗作用的心墙土料的选择与设计至关重要。作为土石坝防渗体的心墙土料,国内外实践中曾经用过残积土、风成土、冰渍土、洪积土、古河川沉积及近代河滩沉积土。砾石土在自然界分布广泛、储量丰富,具有压实性能好、填筑密度大、抗剪强度高、沉陷变形小、承载力高等工程特性,因此已经在土石坝防渗体中得到了较为广泛应用。宽级配砾石土是一种粘性粗粒土,是天然土石的混合料,它通常以5mm为界被分为粗料和细料两部分,颗粒组成是决定宽级配砾石土工程特性的主要因素。本文结合水牛家心墙堆石坝,以大量试验数据为依据,对砾石土的压实性、渗透性以及抗剪强度等方面,作进一步研究。主要的研究内容有:1、详细的阐述了国内外利用砾石土作为心墙料的研究现状;2、鉴于现阶段对粗粒土的没有一个统一的命名,本文结合水利部现行《土工试验规程》(SL237-1999),并参考相关资料,对现阶段关于粗粒土的命名作出一些概括;3、室内进行系列击实试验,结合相关文献研究宽级配砾石土的压实性能,以及影响砾石土的压实性能的主要因素;讨论不同P5含量对砾石土击实特性的影响规律。更多还原

【Abstract】 Among different type of embankment dam, the Earth Core Rock-fill Dam (ERCD) possessed prodigious proportion. In these latter years, ECRD has gradually evolved as one of trunk stream type of dam in the world. According to the statistics at the beginning of nineties of 20th century,among the constructed and being constructed high dam, ECRD is in the proportion of 55.5% around the world. Since the nineties of 20th century. ECRD has developed a lot inland. When we design ECRD, the material of core for anti seepage is in the extreme important. At home and abroad, the native soil, the eolian soil, the moraine, the diluvial soil, the age-old river sediments and the recent river shoal sediments were researched as material core for ECRD.Gravelly soil is wide-ranging distributing in nature. The reservers of gravelly soil is rich. And the engineering properties, etc. compaction performance, reclamation density, shear strength, little subsidence, bearing capacity, is great. So gravelly soil has been widely used for impervious element of embankment dam. The spreading gradation gravelly soil is a kind of clayey coarse-grained soil. It’s also a soil-rock mixtures. It’s often divided into fine material and coarse material by the save of 5mm and the distributed gradation affects its project characteristics directly. The paper is combined with Shui Niujia soil core rock-fill dam. The paper studied more the physical properties of更多还原