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Corresponding Author

吴谦，男，博士，讲师.E-mail：282497832@qq.com

Abstract

The application of carbonaceous shale for subgrade filling not only alleviates the shortage of subgrade filler in carbonaceous shale distribution areas but also meets the strategic requirements of “resource conservation and saving ” and “green development ” for infrastructure construction in China.However，such rocks are weak and susceptible to weathering and disintegration，and they exhibit significant strength deterioration when exposed to water.To fully apply them，their performance must be comprehensively understood.In this paper，the basic properties of the carbonaceous shale were studied，and filler gradation was designed.The tests on compaction characteristics of the filler and particle crushing characteristics after compaction，RCBR （California bearing ratio ） variation characteristics under dry and wet cycle conditions，compression properties of the filler and particle crushing characteristics after compression under dry and wet conditions，as well as the rebound modulus of subgrade during water immersion were conducted.The results show that with an increasing degree of weathering，the original shale tends to become clayey，and the microstructure becomes loose.In the compaction process，coarser filler particles mean that they are more difficult to adjust their position to achieve a stable dense state，and particle crushing is more significant.The filler shows strong softening and disintegration properties when exposed to water.The initial RCBR of the filler is 54%，which exhibits a fast-to-slow decreasing trend under dry and wet cycles and finally stabilizes at about 26%.In the compression tests，additional deformation of the filler by wetting after water immersion is extremely significant，and the crushing particles increase greatly.Particle groups that do not crush at optimum water content also crush after saturation.The rebound modulus of the subgrade without water immersion is 140.4 MPa and declines to 82.1 MPa after 6 h of water immersion，after which the decay of the rebound modulus with increasing immersion time is not significant.For practical application，it is recommended to optimize the gradation of the filler，control the maximum particle size，and adopt subgrade structures that can effectively prevent water and control moisture.In addition，it is necessary to avoid using carbonaceous shale filler in positions with developed surface and ground water.

Publication Date

5-7-2024

DOI

10.14048/j.issn.1671-2579.2024.02.002

First Page

9

Last Page

17

Submission Date

February 2025

Reference

[1]PARVIAINEN A ,LOUKOLA-RUSKEENIEMI K .Environmental impact of mineralised black shales [J].Earth Science Reviews ,2019 ,192:65-90.
[2]KANJI M A .Critical issues in soft rocks [J].Journal of Rock Mechanics and Geotechnical Engineering ,2014 ,6(3):186-195.
[3]BRYSON L S ,GOMEZ-GUTIERREZ I C ,HOPKINS T C .Development of a new durability index for compacted shale [J].Engineering Geology ,2012 ,139/140:66-75.
[4]BRYSON L S ,KIRKENDOLL J S ,MAHMOODABADI M.A new rapid method to assess the durability of shale [J].Geotechnical and Geological Engineering ,2019 ,37(5):4135 -4150 .
[5]张利涛 ,陈常明 ,黄亚飞 ,等.炭质页岩高填路堤合理结构形式比选研究 [J].中外公路 ,2021 ,41(S2):93-98.ZHANG Litao ,CHEN Changming ,HUANG Yafei ,et al .Study on comparison and selection of reasonable structural forms of high-filled embankment with carbon shale [J].Journal of China & Foreign Highway ,2021 ,41(S2):93-98.
[6]谈云志 ,胡莫珍 ,周玮韬 ,等.荷载 ‒干湿循环共同作用下泥岩的压缩特性 [J].岩土力学 ,2016 ,37(8):2165 -2171 .TAN Yunzhi ,HU Mozhen ,ZHOU Weitao ,et al .Effects of drying-wetting cycle and loading on compressive property of mudstone [J].Rock and Soil Mechanics ,2016 ,37(8):2165 -2171 .
[7]杜秦文 ,刘永军 ,曹周阳 .变质软岩路堤填料湿化变形规律研究 [J].岩土力学 ,2015 ,36(1):41-46.DU Qinwen ,LIU Yongjun ,CAO Zhouyang .Large-scale triaxial tests on metamorphic soft rock embankment filler for wetting deformation characteristics [J].Rock and Soil Mechanics ,2015 ,36(1):41-46.
[8]付宏渊 ,刘杰 ,曾铃 ,等.考虑荷载及干湿循环作用的炭质泥岩崩解特征试验 [J].中国公路学报 ,2019 ,32(9):22-31.FU Hongyuan ,LIU Jie ,ZENG Ling ,et al .Disintegration characteristics of carbonaceous mudstone under loading and wet-dry cycles [J].China Journal of Highway and Transport ,2019 ,32(9):22-31.
[9]LIU F F ,MAO X S ,FAN Y S ,et al.Effects of initial particle gradation and rock content on crushing behaviors of weathered phyllite fills-a case of eastern Ankang section of Shiyan-Tianshui highway ,China [J].Journal of Rock Mechanics and Geotechnical Engineering ,2020 ,12(2):269-278.
[10]ZENG L ,YU H C ,LIU J ,et al .Mechanical behaviour of disintegrated carbonaceous mudstone under stress and cyclic drying/wetting [J].Construction and Building Materials ,2021 ,282:122656 .
[11]ZHANG C L ,JIANG G L ,BUZZI O ,et al.Full-scale model testing on the dynamic behaviour of weathered red mudstone subgrade under railway cyclic loading [J].Soils and Foundations ,2019 ,59(2):296-315.
[12]ZHANG B Y ,ZHANG J H ,SUN G L .Deformation and shear strength of rockfill materials composed of soft siltstones subjected to stress ,cyclical drying/wetting and temperature variations [J].Engineering Geology ,2015 ,190:87-97.
[13]ZHANG B Y ,ZHANG J H ,SUN G L .Particle breakage of argillaceous siltstone subjected to stresses and weathering[J].Engineering Geology ,2012 ,137/138:21-28.
[14]YIN Y ,ZHANG B Y ,ZHANG J H ,et al .Effect of densification on shear strength behavior of argillaceous siltstone subjected to variations in weathering-related physical and mechanical conditions [J].Engineering Geology ,2016 ,208:63-68.
[15]张静波 ,吕岩松 ,王云 .贵州地区炭质页岩填料路用性能与路基结构设计研究 [J].公路 ,2016 ,61(11):35-40.ZHANG Jingbo ,LYU Yansong ,WANG Yun .Research on performance and subgrade structure design of carbonaceous shale filler in Guizhou area [J].Highway ,2016 ,61(11):35-40.
[16]付泓锐 .炭质泥岩填料静止侧压力系数试验研究 [J].五邑大学学报 (自然科学版 ),2017 ,31(3):67-72.FU Hongrui .An experimental study of static pressure coefficients of carbonaceous mudstone [J].Journal of Wuyi University (Natural Science Edition ),2017 ,31(3):67-72.
[17]付宏渊 ,邱祥 ,李光裕 ,等.降雨入渗条件下炭质泥岩路堤动态稳定性 [J].长安大学学报 (自然科学版 ),2017 ,37(1):33-42.FU Hongyuan ,QIU Xiang ,LI Guangyu ,et al .Dynamic stability of carbonaceous mudstone embankment under rainfall infiltration [J].Journal of Chang ’an University (Natural Science Edition ),2017 ,37(1):33-42.
[18]曾铃 ,邱祥 ,付宏渊 ,等.水位升降过程中崩解预处理炭质泥岩路堤稳定性分析 [J].中国公路学报 ,2017 ,30(5):10-19.ZENG Ling ,QIU Xiang ,FU Hongyuan ,et al .Analysis of stability of carbonaceous mudstone embankment after disintegration pretreatment during process of water level fluctuation [J].China Journal of Highway and Transport ,2017 ,30(5):10-19.
[19]耿帆，刘杰 .荷载与干湿循环作用下预崩解炭质泥岩抗剪强度及渗透特性 [J].中外公路 ，2021 ,41（4） ：357-361.Geng Fan ,Liu Jie .Shear strength and permeability characteristics of predisintegrated carbonaceous mudstone under load and dry-wet cycles [J].Journal of China & Foreign Highway ,2021，41(4):357-361.
[20]王立久 ,刘慧 .矿料级配设计理论的研究现状与发展趋势[J].公路 ,2008 ,53(1):170-175.WANG Lijiu ,LIU Hui .Current status and future trends of aggregate grading design theory [J].Highway ,2008 ,53(1):170-175.
[21]ZHAO Y L ,XU T ,HUANG X M ,et al .Gradation design of the aggregate skeleton in asphalt mixture [J].Journal of Testing and Evaluation ,2012 ,40(7):20120142 .
[22]ŠERNAS O ,ZOFKA A ,VAITKUS A ,et al .The effect of exposed aggregate concrete gradation on the texture characteristics and durability [J].Construction and Building Materials ,2020 ,261:119921 .
[23]王萌 ,肖源杰 ,王小明 ,等.道砟压实质量与颗粒运动关联特征及内在机制研究 [J].铁道科学与工程学报 ,2021 ,18(8):2055 -2065 .WANG Meng ,XIAO Yuanjie ,WANG Xiaoming ,et al .Investigating correlation characteristics and intrinsic mechanism between compaction quality and particle movement of railway ballasts [J].Journal of Railway Science and Engineering ,2021 ,18(8):2055 -2065 .
[24]WU Q ,MAO X S ,ZHAO Y ,et al .Model experiments to study the hydrothermal variation and resilient modulus of soil subgrade subjected to freeze-thaw conditions [J].Case Studies in Construction Materials ,2022 ,16:e01145 .
[25]曾铃 ,肖柳意 ,刘杰 ,等.预崩解炭质泥岩路堤填料工程性能试验研究 [J].铁道科学与工程学报 ,2020 ,17(1):73-81.ZENG Ling ,XIAO Liuyi ,LIU Jie ,et al .Experiment study on road mechanical properties and permeability characteristics of pre-disintegration carbonaceous mudstone [J].Journal of Railway Science and Engineering ,2020 ,17(1):73-81.
[26]甘文宁 ,朱大勇 ,刘拴奇 ,等.皖南山区崩解性红砂岩路用性能研究 [J].合肥工业大学学报 (自然科学版 ),2014 ,37(2):209-214.GAN Wenning ,ZHU Dayong ,LIU Shuanqi ,et al .Road performance of disintegrated red sandstone in mountainous areas of southern Anhui [J].Journal of Hefei University of Technology (Natural Science ),2014 ,37(2):209-214.
[27]毛雪松 ,周雷刚 ,马骉 ,等.强风化千枚岩填筑路基改良技术研究 [J].中国公路学报 ,2012 ,25(2):20-26.MAO Xuesong ,ZHOU Leigang ,MA Biao ,et al .Research on improvement technology of filling subgrade with highly-weathered phyllite [J].China Journal of Highway and Transport ,2012 ,25(2):20-26.
[28]张莎莎 ,杨晓华 ,王明皎 ,等.泥质软岩土石混合料弃渣路用性能研究 [J].公路交通科技 ,2015 ,32(2):55-59.ZHANG Shasha ,YANG Xiaohua ,WANG Mingjiao ,et al .Study on road performance of argillaceous soft rock earth mixture spoil [J].Journal of Highway and Transportation Research and Development ,2015 ,32(2):55-59.
[29]张静波 ,何斌 ,杨露 ,等.软岩路堤填料干湿循环大型压缩变形试验研究 [J].公路 ,2017 ,62(10):46-50.ZHANG Jingbo ,HE Bin ,YANG Lu ,et al .Test and study of large scale compression deformation test for soft rock filling under dry wet cycles [J].Highway ,2017 ,62(10):46-50.

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