土石混合填料工程力学性能试验研究  

Experimental study on engineering mechanical properties of soil rock mixture

作　　者：苏利华 谭璐璐 冯守中 孙立强[4] 李琪蕾 郎瑞卿 SU Li-hua;TAN Lu-lu;FENG Shou-zhong;SUN Li-qiang;LI Qi-lei;LANG Rui-qing(Anhui Provincial Bureau of Comprehensive Law Enforcement and Supervision of Transportation,Hefei,Anhui 230051,China;Anhui Chuning Expressway Co.,Ltd.,Chuzhou,Anhui 239200,China;School of Civil and Architectural Engineering,Chuzhou University,Chuzhou,Anhui 239001,China;School of Architecture and Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Tianjin Urban Construction University,Tianjin 300384,China)

机构地区：[1]安徽省交通运输综合执法监督局,安徽合肥230051 [2]安徽滁宁高速公路股份有限公司,安徽滁州239200 [3]滁州学院土木与建筑工程学院,安徽滁州239001 [4]天津大学建筑工程学院,天津300072 [5]天津城建大学土木工程学院,天津300384

出　　处：《中国港湾建设》2024年第9期55-60,共6页China Harbour Engineering

基　　金：国家自然科学基金(52078336,42277133);中国博士后基金面上项目(2022M721000);中国科协青年托举工程(YESS20230586);天津市研究生科研创新项目(2022SKYZ179)。

摘　　要：土石混合填料力学性能是影响路堤设计和施工的重要参数,相关研究一直是热点问题。为分析不同含水率、土石混合比例、击实功、土料厚度条件下土石混合体工程力学性能,开展了不同组合下土石混合体击实试验和大型直剪试验,揭示了上述因素对混合料最优含水率和力学指标的影响,并建立了土石混合填料力学指标计算方法。研究表明:总击实功、含水率和含石量对试样干密度影响较大,且随着含石量的增大,土石混合料最大干密度逐渐增大但最优含水率逐渐降低;干密度随着每层击实次数的增加而增加;随着法向应力的增大,土石混合料应力-应变曲线由应变硬化型逐渐变为应变软化型;随着含石量的增大,其内摩擦角随之减小但黏聚力随之增大,但增大幅度较小。成果可为土石混合填料路堤施工和设计提供理论参考。The mechanical properties of soil rock mixture are important parameters affecting the design and construction of embankment.Therefore,the related research has always been a hot topic.To analyze the mechanical properties of soil rock mixture under different moisture content,soil rock mixing ratio,compaction work and soil material thickness conditions,compaction tests and large-scale direct shear tests were conducted on soil rock mixture under different combinations.The influence of the above factors on the optimal water content and mechanical index of the mixture was revealed,and a calculation method for the mechanical indicators of soil rock mixture was established.The research shows that the total compaction work,moisture content,and stone content have a significant impact on the dry density of the sample.As the stone content increases,the maximum dry density of the soil rock mixture gradually increases but the optimal moisture content gradually decreases.The dry density increases with the increase of compaction times per layer.As the normal stress increases,the stress-strain curve of soil rock mixture gradually changes from strain hardening type to strain softening type.As the stone content increases,the internal friction angle decreases but the cohesion increases slightly.The results can provide theoretical reference for the construction and design of the embankment with soil rock mixture.

关 键 词：土石混填料 力学性能 击实功 土石比 最优含水率 

分 类 号：U654[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]