基于颗粒破碎特性的盐岩集料基层级配组成设计研究  

Gradation composition design of salt rock aggregate base based on particle breakage characteristics

作　　者：王朝辉[1] 问鹏辉 宋亮 牛亮亮 奚鹤 WANG Chao-hui;WEN Peng-hui;SONG Liang;NIU Liang-liang;XI He(Key Laboratory for Special Area High Way Engineering of the Ministry of Education,Chang’an University,Xi’an,Shaanxi 710064,China;Xinjiang Transportation Planning Surveying and Design Institute Co.,Ltd.,Urumqi,Xinjiang 830006,China;Xinjiang Communications Investment Construction Management Co.,Ltd.,Urumqi,Xinjiang 830049,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]新疆交通规划勘察设计研究院有限公司,新疆乌鲁木齐830006 [3]新疆交投建设管理有限责任公司,新疆乌鲁木齐830049

出　　处：《岩土力学》2024年第2期340-352,共13页Rock and Soil Mechanics

基　　金：交通运输行业重点科技项目(No.2019-MS1-024);新疆维吾尔自治区自然科学基金(No.2020-D01-A92);新疆维吾尔自治区交通运输行业科技项目(No.2019-ZD1-015)。

摘　　要：为实现内陆干盐湖区盐岩集料基层级配组成的科学设计,以罗布泊盐岩为研究对象,分析了不同粒径及含卤水率条件下单粒组盐岩集料颗粒破碎演化特征,构建了复杂粒组下盐岩集料级配转移模型,提出了盐岩集料基层级配组成设计方法,验证了盐岩集料基层级配组成设计方法的合理性,并对比了不同级配组成及失水率下盐岩集料的工程性质。结果表明:击实作用下各粒组盐岩集料均发生颗粒破碎,随着击实能量增加,盐岩集料级配趋于稳定,卤水的赋存会降低单粒组盐岩颗粒破碎率。Weibull分布可有效表征盐岩集料破碎颗粒级配分布特征。推荐的盐岩集料基层级配组成设计方法可有效推演盐岩集料基层的级配演化特征并实现考虑卤水影响的级配修正。盐岩集料颗粒间卤水盐分结晶有利于盐岩集料基层强度形成,失水率为75%的盐岩集料无侧限抗压强度可达到4.1 MPa,盐岩集料可用于干盐湖区公路基层填筑工程。To achieve the scientifically designed gradation composition of a salt rock aggregate base in an inland dry salt lake,this study focused on the salt rock in Lop Nur as the research subject.The analysis examined the particle breakage evolution of a single particle group of salt rock aggregate under different particle sizes and brine contents.A gradation transition model for salt rock aggregate under complex gradation was constructed,and a gradation composition design method for salt rock aggregate base was proposed.The rationality of this design method was verified,and the engineering properties of the rock salt aggregate were compared under different gradations and water loss rates.The results demonstrated that all particle groups of the salt rock aggregate experienced breakage during compaction.The gradation of uniformly graded salt rock aggregate tended to stabilize with increasing compaction work.The presence of brine reduced the particle breakage rate of uniformly graded salt rock aggregate.The Weibull distribution effectively characterized the particle breakage distribution characteristics of the salt rock aggregate.The recommended gradation composition design method of salt rock aggregate base successfully deduced the gradation characteristics of salt rock aggregate base and realized the gradation correction considering the influence of brine.Salt crystallization of brine among salt rock particles was conducive to promoting the strength formation of salt rock aggregate base.The unconfined compressive strength of the salt rock aggregate with a water loss rate of 75% reached 4.1 MPa,indicating its suitability for road base engineering in dry salt lake areas.

关 键 词：道路工程 盐岩集料 级配组成设计 基层 颗粒破碎 罗布泊 

分 类 号：U419[交通运输工程—道路与铁道工程]