水的形态对土体收缩性及贯入强度的影响
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摘要
土中水是土体的重要组成部分,其与土颗粒的结合形态也是影响土体物理力学性质的重要因素。通过不同含水率下土体的收缩试验和袖珍贯入试验,研究了土中水的形态对土体收缩性及贯入强度的影响规律。结果表明:土中水的结合形态对土体收缩性及贯入强度有显著影响,最大吸着水含量是一个临界点。土体初始含水量高于临界值时,随含水量的增加,土体收缩变形急剧递增,贯入强度递减;土体初始含水量低于临界值时,随含水量的减少,土体收缩变形变化微小,贯入强度递减。
Water is an important component of soil, and its formation is also a significant factor for the influence on physical and mechanical properties of soil. The influence rule of water formation on mechanical properties of soil is studied by shrinkage test and miniature penetration test with soils of different water content. The results show that the water formation has remarkable influence to the mechanical properties of soil, and the largest content of hygroscopic water is a critical point. When the initial water content is higher than the largest content of hygroscopic water, the shrinkage strain increases remarkably and penetration intensity decreases progressively along with the increasing of water content. When the initial water content is lower than the largest content of hygroscopic water, the shrinkage strain has subtle change and penetration intensity decreases progressively along with the decreasing of water content.
Water is an important component of soil, and its formation is also a significant factor for the influence on physical and mechanical properties of soil. The influence rule of water formation on mechanical properties of soil is studied by shrinkage test and miniature penetration test with soils of different water content. The results show that the water formation has remarkable influence to the mechanical properties of soil, and the largest content of hygroscopic water is a critical point. When the initial water content is higher than the largest content of hygroscopic water, the shrinkage strain increases remarkably and penetration intensity decreases progressively along with the increasing of water content. When the initial water content is lower than the largest content of hygroscopic water, the shrinkage strain has subtle change and penetration intensity decreases progressively along with the decreasing of water content.
引文
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[3]库里契茨基Λ И.粘土矿物水化作用的实质和粘土岩的亲水性[M].李生林,薄遵照,秦素娟,等译.土中结合水译文集.北京:地质出版社,1982:127.
[4]王平全,谭敬明,程地奎.用红外光谱法确定粘土表面结合水界限[J].西南石油学院学报,2001,23(2):53-55.
[5]王平全.用离子交换法确定粘土表面结合水界限[J].西南石油学院学报,2000,22(1):59-61.
[6]王平全,李晓红.用热失重法确定水合粘土水分含量及存在形式[J].天然气工业,2006,26(1):80-83.
[7]王玉英,阎长虹,陈明珠,等.贵州普定陈旗堡地区土体主要理化性质与持水量相关性研究[J].地质论评,2008,54(4):550-556.
[8]肖琳,李晓昭,赵晓豹,等.含水量与孔隙率对土体热导率影响的室内实验[J].解放军理工大学学报(自然科学版),2008,9(3):241-247.
[9]苏天明,刘彤,李晓昭,等.南京地区土体热物理性质测试与分析[J].岩石力学与工程学报,2006,25(6):1278-1283.
[10]王铁行,刘自成,卢靖.黄土导热系数和比热容的实验研究[J].岩土力学,2007,28(4):655-658.
[11]许传福.弱透水层饱和粘性土中水分渗透规律研究[J].吉林地质,2008,27(1):30-32.
[12]王秀艳,刘长礼.对粘性土孔隙水渗流规律本质的新认识[J].地球学报,2003,24(1):91-95.
[13]冯炜炜,陆会清,姚力.浅谈土的不同物质组成对毛细性的影响[J].新疆有色金属,2004(2):16-18.
[14]索科洛夫B H,奥西波夫B H.不同类型结合水对粘土强度的影响[M].李生林,薄遵照,秦素娟,等译.土中结合水译文集.北京:地质出版社,1982:148-158.
[15]谭罗荣,张梅英,邵梧敏,等.风干含水量W65用作膨胀土判别分类指标的可行性研究[J].工程地质学报,1994,2(1):15-26.
[16]Dirksen C,Dasberg S.Improved calibration of time domain reflectometry soil water content measurements[J].Soil Science Society of America Journal,1993,57(3):660-667.