煤矸石风化对其物理力学性能影响的研究
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摘要
本文主要进行了不同风化时间的煤矸石路堤填料现场筛分试验、室内标准击实试验和抗剪强度试验.利用FLAC~(3D)软件建立了煤矸石路堤数值分析模型,分析了不同风化时间、最佳含水量、饱水状态不同路堤高度对路堤稳定性的影响.结果表明:未风化煤矸石和经过不同风化时间的煤矸石粒径分布都不均匀,级配良好.煤矸石风化36个月后,细料含量和最大干密度均达到最大.在最佳含水量状态,随着风化时间的增加,煤矸石的黏聚力持续增加,而在饱水状态下,煤矸石的黏聚力持续降低.数值模拟结果表明:在最佳含水量状态,路堤高度相同时,随着风化时间的增加,安全系数逐渐减小.饱水状态的安全系数明显比最佳含水量状态的低.
The on-site sieve tests,indoor standard compaction tests, and shear strength tests of coal gangue with different weathering time were performed. Using the FLAC~(3 D) software,a numerical analysis model of coal gangue embankment was established to analyze the effect of the embankment height, optimum moisture content and degree of saturation on the stability of embankment with different weathering time. The test results show that the initial coal gangue and the weathered coal gangue contain particles of strongly different grain sizes and they are denoted as well graded soils. After 36 months of weathering,the fines content and maximum dry density of coal gangue mixture reach peak values. Under the optimum moisture content, the cohesion of coal gangue increases with the increase of weathering time, while under the saturation state, the cohesion of coal gangue continues to decrease with the increase of weathering time. The numerical simulation results show that the safety factor of embankment decreases with the increase of weathering time under the optimal water content state. The safety factor in the saturated state is significant lower than that under the optimum moisture content state.
The on-site sieve tests,indoor standard compaction tests, and shear strength tests of coal gangue with different weathering time were performed. Using the FLAC~(3 D) software,a numerical analysis model of coal gangue embankment was established to analyze the effect of the embankment height, optimum moisture content and degree of saturation on the stability of embankment with different weathering time. The test results show that the initial coal gangue and the weathered coal gangue contain particles of strongly different grain sizes and they are denoted as well graded soils. After 36 months of weathering,the fines content and maximum dry density of coal gangue mixture reach peak values. Under the optimum moisture content, the cohesion of coal gangue increases with the increase of weathering time, while under the saturation state, the cohesion of coal gangue continues to decrease with the increase of weathering time. The numerical simulation results show that the safety factor of embankment decreases with the increase of weathering time under the optimal water content state. The safety factor in the saturated state is significant lower than that under the optimum moisture content state.
引文
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[2] 李爱国.京福国道徐州东绕城高速公路煤矿采空区治理[J].中南公路工程,2002,27(4):26-28.LI Aiguo.Control of the gob area of Xuzhou east ring expressway in Jingfu national road[J].Central South Highway Project,2002,27(4):26-28.
[3] 邱钰,缪林昌,刘松玉.煤矸石在道路建设中的应用研究现状及实例[J].公路交通科技,2002,19(2):1-5.QIU Yu,MIAO Linchang,LIU Songyu.Application study and practice of coal gangue applied in road construction[J].Journal of Highway and Transportation Research and Development,2002,19(2):1-5.
[4] 刘春荣,王东权,朱玉晓.矿产废料煤矸石作为路基填料的试验研究[J].重庆交通学院学报,2004,23(5):52-54.LIU Chunrong,WANG Dongquan,ZHU Yuxiao.Experiment study on using coal slack as the filling of roadbed[J].Journal of Chongqing Jiaotong University,2004,23(5):52-54.
[5] 姜振泉,赵道辉,隋旺华,等.煤矸石固结压密性与颗粒级配缺陷关系研究[J].中国矿业大学学报,1999,28(3):212-216.JIANG Zhenquan,ZHAO Daohui,SUI Wanghua,et al.Study on relationship between consolidation-compactness and size grade shortage of coal gangue[J].Journal of China University of Mining & Technology,1999,28(3):212-216.
[6] 刘松玉,童立元,邱钰,等.煤矸石颗粒破碎及其对工程力学特性影响研究[J].岩土工程学报,2005,27(5):505-510.LIU Songyu,TONG Liyuan,QIU Yu,et al.Crushable effects on engineering mechanical properties of colliery wastes[J].Chinese Journal of Geotechnical Engineering,2005,27(5):505-510.
[7] 刘松玉,邱钰,童立元,等.煤矸石的动力特性试验研究[J].东南大学学报(自然科学版),2005,35(2):280-283.LIU Songyu,QIU Yu,TONG Liyuan,et al.Experinental research on dynamic properties of coal mining wastes[J].Journal of Southeast University(Natural Science Edition),2005,35(2):280-283.
[8] 刘松玉,邱钰,童立元,等.煤矸石的强度特征试验研究[J].岩石力学与工程学报,2006,25(1):199-205.LIU Songyu,QIU Yu,TONG Liyuan,et al.Experimental study on strength properties of coal wastes[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):199-205.
[9] 黄方意,徐江.煤矸石风化试验研究及风化对煤矸石地基的影响[J].四川建筑,2004,2:61-62.HUANG Fangyi,XU Jiang.Experimental study on coal gangue weathering and influence of weathering on coal gangue foundation[J].Sichuan Architecture,2004,2:61-62.
[10] 张雁,孟凡凤,郭利勇,等.煤矸石的风化性质对公路路用性能的影响[J].煤炭工程,2011,12:94-96.ZHANG Yan,MENG Fanfeng,GUO Liyong,et al.Influence of coal gangue weathering on road performance[J].Coal Engineering,2011,12:94-96.
[11] 胡振华,王电龙,胡起跃,等.风化煤矸石入渗规律模拟[J].中国水土保持科学,2008,6(2):55-59.HU Zhenhua,WANG Dianlong,HU Qiyue,et al.Simulation of weathered coal gangue infiltration[J].Science of Soil and Water Conservation,2008,6(2):55-59.
[12] 严家平,陈孝杨,蔡毅,等.不同风化年限的淮南矿区煤矸石理化性质变化规律[J].农业工程学报,2017,33(3):168-174.YAN Jiaping,CHEN Xiaoyang,CAI Yi,et al.Physicochemical property change regularities of coal gangue with different weathering ages in Huainan minging area[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(3):168-174.
[13] 李东升,刘东升,贺文俊,等.风化煤矸石抗剪强度粒径影响试验研究[J].工程地质学报,2016,24(3):376-383.LI Dongsheng,LIU Dongsheng,HE Wenjun,et al.Experimental study on the effect of partical size to shier strength of weathering gangue[J].Journal of Engineering Geology,2016,24(3):376-383.
[14] 贺文俊.煤矸石风化强度特性及稳定性研究[D].重庆:重庆大学,2016:19-36.HE Wenjun.Coal gangue weathering strength characteristics and stability study[D].Chongqing:Chongqing University,2016:19-36.
[15] 王义川.采煤沉陷区煤矸石铁路路堤水稳定性研究[D].徐州:中国矿业大学,2014:23-53.WANG Yichuan.Study on water stability of coal gangue railway embankment in mining subsidence[D].Xuzhou:China University of Mining and Technology,2014:23-53.
[16] BIAN Zhengfu,INYANG H,DANIELS J,et al.Environmental issues from coal mining and their solutions[J].Mining Science and Technology,2010,20(2):215-223.
[17] DHARMAPPA H B,WINGROVE K,SIVAKUMAR M,et al.Wastewater and stormwater minimisation in a coal mine.[J].Journal of Cleaner Production,2000,8(1):23-34.
[18] 崔景彦.煤矸石衰变对路堤稳定性影响研究[D].徐州:中国矿业大学,2014:9-28.CUI Jingyan.Research on the stability of coal gangue embankment under decayed state[D].Xuzhou:China University of Mining and Technology,2014:9-28.
[19] 张克恭,刘松玉.土力学[M].北京:中国建筑工业出版社,2012:14-19.ZHANG Kegong,LIU Songyu.Soil mechanics[M].Beijing:China Building Industry Press,2012:14-19.
[20] 中华人民共和国行业标准编写组.公路土工试验规程:JTG E40—2007[S].北京:人民交通出版社,2007:132-258.The Professional Standards Compilation Group of People’s Republic of China.Test methods of soils for highway engineering:JTG E40—2007[S].Beijing:China Communications Press,2007:132-258.
[21] 陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2017:265-276.CHEN Yumin,XU Dingping.FLAC/FLAC3D foundation and engineering examples[M].Beijing:China Water Conservancy and Hydropower Press,2017:265-276.