干湿循环条件下水泥改良泥质板岩粗粒土的静力特性试验研究
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摘要
为研究水泥改良泥质板岩粗粒土静力性质的干湿循环效应,首先,使标准养护龄期达到28 d以上的试样经受干湿循环作用,然后,该试样开展大型三轴压缩试验。通过试验得到改良土样的轴向最大应力差、内摩擦角、黏聚力和弹性模量等力学参数随干湿循环次数变化的规律,并分析围压和养护龄期对这些变化规律的影响。研究结果表明:随着干湿循环作用次数增加,轴向最大应力差、内摩擦角、黏聚力和弹性模量等力学参数均有所衰减,但衰减到一定程度后逐渐趋于稳定,其中,内摩擦角的衰减幅度最小;轴向最大应力差和弹性模量的衰减幅度均随围压的增大而减小;随着养护龄期增大,轴向最大应力差和黏聚力的衰减幅度均减小,但养护龄期对弹性模量和内摩擦角的衰减幅度影响不大。
In order to research drying-wetting cycle effects on static mechanical properties of cement-improved argilliteslate coarse-grained soil, large tri-axial compression tests were conducted on the cement-improved soil samples with over28 d of the standard curing ages when the samples were subjected to drying-wetting cycles. Changes of the axial maximum stress difference, internal friction angle, cohesion and elastic modulus of the samples with the drying-wetting cycle indexes were obtained by the tests. On that basis, the relationship between the changes and confining pressure as well as that between the changes and standard curing age were analyzed. The results show that with the increase of the drying-wetting cycle index, mechanical parameters such as the axial maximum stress difference, the internal friction angle, the cohesion and the elastic modulus of the soil all decay until they become stable. The decay of the internal friction angle in drying-wetting cycles is smaller than that of the other mechanical parameters. With the increase of the confining pressure, the decay of both the axial maximum stress difference and elastic modulus decrease in drying-wetting cycles. The decay of the axial maximum stress difference and cohesion in drying-wetting cycles decrease with the increase of the standard curing age, while the decay of both elastic modulus and internal friction angle are almost unaffected by standard curing age.
In order to research drying-wetting cycle effects on static mechanical properties of cement-improved argilliteslate coarse-grained soil, large tri-axial compression tests were conducted on the cement-improved soil samples with over28 d of the standard curing ages when the samples were subjected to drying-wetting cycles. Changes of the axial maximum stress difference, internal friction angle, cohesion and elastic modulus of the samples with the drying-wetting cycle indexes were obtained by the tests. On that basis, the relationship between the changes and confining pressure as well as that between the changes and standard curing age were analyzed. The results show that with the increase of the drying-wetting cycle index, mechanical parameters such as the axial maximum stress difference, the internal friction angle, the cohesion and the elastic modulus of the soil all decay until they become stable. The decay of the internal friction angle in drying-wetting cycles is smaller than that of the other mechanical parameters. With the increase of the confining pressure, the decay of both the axial maximum stress difference and elastic modulus decrease in drying-wetting cycles. The decay of the axial maximum stress difference and cohesion in drying-wetting cycles decrease with the increase of the standard curing age, while the decay of both elastic modulus and internal friction angle are almost unaffected by standard curing age.
引文
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[2]闫国栋,李亮,舒海明,等.全风化泥质板岩改良土无侧限抗压强度试验研究[J].岩土工程界,2009,12(7):73-76.YAN Guodong,LI Liang,SHU Haiming,et al.Experimental research on unconfined compressive strength of fully weathered argillite-slate soil improved[J].Geotechnical Engineering World,2009,12(7):73-76.
[3]王建华,高玉琴.干湿循环过程导致水泥改良土强度衰减机理的研究[J].中国铁道科学,2006,27(5):23-25.WANG Jianhua,GAO Yuqin.Study on the strength degradation mechanism of cement-soils resulting from dry-wet cycles[J].China Railway Science,2006,27(5):23-25.
[4]柏威伟.鲁北地区改良盐渍土耐久性试验研究[J].交通科技,2016(2):166-168.BAI Weiwei.Experimental study on improving the durability of saline soil in northern Shandong region[J].Transportation Science&Technology,2016(2):166-168.
[5]李冬立,聂志红.全风化泥质板岩填料改良的室内试验研究[J].铁道建筑,2010(1):122-124.LI Dongli,NIE Zhihong.Test of fully weathered argillite-slate soil improved[J].Railway Engineering,2010(1):122-124.
[6]郑旭,刘松玉,蔡光华,等.活性MgO碳化固化土的干湿循环特性试验研究[J].岩土工程学报,2016,38(2):297-304.ZHENG Xu,LIU Songyu,CAI Guanghua,et al.Experimental study on drying-wetting properties of carbonated reactive MgO-stabilized soils[J].Chinese Journal of Geotechnical Engineering,2016,38(2):297-304.
[7]郑军,阎长虹,夏文俊,等.干湿循环对新型固化土承载强度影响的试验研究[J].岩石力学与工程学报,2009,28(1):3051-3057.ZHENG Jun,YAN Changhong,XIA Wenjun,et al.Experimental study of influence of drying and wetting cycles on bearing capacity of improved soil by CMSC soil stabilized agent[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(1):3051-3057.
[8]曹豪荣,李新明,樊友杰,等.考虑干湿循环路径的石灰改性红黏土路用性能试验研究[J].岩土力学,2012,33(9):2619-2624.CAO Haorong,LI Xinming,FAN Youjie,et al.Experimental study of pavement performances of lime-treated laterite soil considering drying-wetting cycle paths[J].Rock and Soil Mechanics,2012,33(9):2619-2624.
[9]吕海波,曾召田,赵艳林,等.膨胀土强度干湿循环试验研究[J].岩土力学,2009,30(12):3797-3802.LüHaibo,ZENG Zhaotian,ZHAO Yanlin,et al.Experimental studies of strength of expansive soil in drying and wetting cycle[J].Rock and Soil Mechanics,2009,30(12):3797-3802.
[10]曹智国,章定文,刘松玉.固化铅污染土的干湿循环耐久性试验研究[J].岩土力学,2013,34(2):3485-3490.CAO Zhiguo,ZHANG Dingwen,LIU Songyu.Experimental research on durability of solidified lead-contaminated soils under wetting-drying cycles[J].Rock and Soil Mechanics,2013,34(2):3485-3490.
[11]陈乐求,陈俊桦,张家生.干湿循环作用下水泥改良泥质板岩粗粒土动力特性[J].湖南大学学报(自然科学版),2017,44(9):107-113.CHEN Leqiu,CHEN Junhua,ZHANG Jiasheng.Dynamic properties of cement-improved argillite-slate coarse-grained soil under drying-wetting cycles[J].Journal of Hunan University(Science and Technology),2017,44(9):107-113.
[12]祝艳波,余宏明,杨艳霞,等.红层泥岩改良土特性室内试验研究[J].岩石力学与工程学报,2013,32(2):425-432.ZHU Yanbo,YU Hongming,YANG Yanxia,et al.Indoor experimental research on characteristics of improved redmudstone[J].Chinese Journal of Geotechnical Engineering,2013,32(2):425-432.
[13]陈乐求,陈俊桦,张家生,等.水泥改良泥质板岩土动力特性试验[J].中南大学学报(自然科学版),2017,48(7):1858-1865.CHEN Leqiu,CHEN Junhua,ZHANG Jiasheng,et al.Test of dynamic properties of argillite-slate soil improved by cement[J].Journal of Central South University(Science and Technology),2017,48(7):1858-1865.
[14]陈乐求,张家生,陈俊桦.泥质板岩改良土物理力学性质试验[J].湖南理工学院学报(自然科学版),2017,30(1):63-68.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua.Test of physical and mechanical properties of improved argillite-slate soil[J].Journal of Hunan Institute of Science and Technology(Science and Technology),2017,30(1):63-68.
[15]杨广庆.水泥改良土的动力特性试验研究[J].岩石力学与工程学报,2003,22(7):1156-1160.YANG Guangqing.Study of dynamic performance of cement-improved soil[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(7):1156-1160.
[16]陈乐求,张家生,陈俊桦,等.水泥改良泥质板岩粗粒土的静动力特性试验[J].岩土力学,2017,38(7):1903-1910.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua,et al.Testing of static and dynamic strength properties of cement-improved argillaceous-slate coarse-grained soil[J].Rock and Soil Mechanics,2017,38(7):1903-1910.
[17]杨和平,张锐,郑健龙.有荷条件下膨胀土的干湿循环胀缩变形及强度变化规律[J].岩土工程学报,2006,28(11):1936-1941.YANG Heping,ZHANG Rui,ZHENG Jianlong.Variation of deformation and strength of expansive soil during cyclic wetting and drying under loading condition[J].Chinese Journal of Geotechnical Engineering,2006,28(11):1936-1941.
[18]李磊,朱伟,林城,等.干湿循环条件下固化污泥的物理稳定性研究[J].岩土力学,2009,30(10):3001-3006.LI Lei,ZHU Wei,LIN Cheng,et al.Study of wet and dry properties of solidified sludge[J].Rock and Soil Mechanics,2009,30(10):3001-3006.
[19]王海俊,殷宗泽.干湿循环作用对堆石长期变形影响的试验研究[J].防灾减灾工程学报,2012,32(4):488-493.WANG Haijun,YIN Zongze.Experimental study on long-time deformation of rockfill under wetting-drying cycle effect[J].Journal of Disaster Prevention and Mitigation Engineering,2012,32(4):488-493.
[20]张虎元,严耿升,赵天宇,等.土建筑遗址干湿耐久性研究[J].岩土力学,2011,32(2):347-355.ZHANG Huyuan,YAN Gengsheng,ZHAO Tianyu,et al.Durability of earthen architecture ruins under cyclic wetting and drying[J].Rock and Soil Mechanics,2011,32(2):347-355.
[21]张清振,袁会娜,张其光,等.堆石料干湿循环变形特性试验研究[J].水力发电学报,2015,34(12):33-41.ZHANG Qingzhen,YUAN Huina,ZHANG Qiguang,et al.Experimental study on deformation characteristics of rock-fill material under cyclic drying-wetting[J].Journal of Hydroelectric Engineering,2015,34(12):33-41.
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