吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (5): 1475-1481.doi: 10.13278/j.cnki.jjuese.201605203
洪勇1, 岳玉秋1, 郑孝玉2, 车效文1, 刘鹏1
Hong Yong1, Yue Yuqiu1, Zheng Xiaoyu2, Che Xiaowen1, Liu Peng1
摘要:
以大连滨海地区典型粉质黏土为研究对象,利用大型高速环剪仪,针对不同法向应力和剪切速率条件下该粉质黏土大剪切力学性质的变化情况进行了试验。环剪试验结果显示:1)该滨海粉质黏土在正常固结状态下出现明显的应变软化现象,分析表明其应变软化特性主要与土中黏土矿物质量分数及其在剪切过程中的定向排列有关。2)在相同剪切速率下,峰值强度和残余强度随法向应力的增加而增大,峰值强度与法向应力之间表现出良好的线性关系。3)由于峰值强度产生过程中土体内部黏聚力的变化,峰值强度随剪切速率的增加而增大;残余强度变化与剪切速率具有一定的相关性,这与不同剪切速率下剪切带(面)处黏土颗粒定向排列程度不同有关。
中图分类号:
[1] 牛岑岑,王清,苑晓青,等.渗流作用下吹填土微观结构特征定量化研究[J].吉林大学学报(地球科学版), 2011,41(4):1104-1109. Niu Cencen,Wang Qing,Yuan Xiaoqing,et al. Quantitative Research on Microstructure Features of Dredger Fill Under Seepage Flow[J]. Journal of Jilin University(Earth Science Edition),2011,41(4):1104-1109.[2] 刘莹,王清,肖树芳.不同地区吹填土基本性质对比研究[J].岩土工程技术,2003(4):197-200. Liu Ying,Wang Qing,Xiao Shufang. The Comparative Research on Fundamental Properties of Dredger Fill in Different Areas[J]. Geotechnical Engineering Technique,2003(4):197-200.[3] 刘莹,肖树芳,王清.吹填土沉积固化后结构强度增长的机理分析[J].同济大学学报,2003,31(9):1295-1299. Liu Ying,Xiao Shufang,Wang Qing. Mechnism Analysis of Increase in Structural Strength of Solidified Dredger Fill[J]. Journal of Tongji University,2003,31(9):1295-1299.[4] 杨坪,唐益群,王建秀,等.基于大变形的冲填土自重固结分析及离心模型试验[J].岩石力学与工程学报,2007,26(6):1212-1219. Yang Ping,Tang Yiqun,Wang Jianxiu,et al. Study on Consolidation Settlement of Dredger Fill Under Deadweight Using Large Strain Theory and Centrifuge Model Test[J]. Chinese Journal of Mechanics and Engineering,2007,26(6):1212-1219.[5] 杨爱武,周金,孔令伟.天津滨海新区吹填软土固化试验验研究[J].岩土力学,2013,34(9):2442-2448. Yang Aiwu,Zhou Jin,Kong Lingwei. Experimental Study of Solidification of Soft Dredger Fill in Tianjin Binhai New Area[J]. Rock and Soil Mechanics. 2013,34(9):2442-2448.[6] 蒋明镜,彭立才,朱合华.珠海海积软土剪切带微观结构实验研究[J].岩土力学,2010,31(7):2017-2023,2029. Jiang Mingjing,Peng Licai,Zhu Hehua. Microscopic Investigation on Shear Band of Marine Clay in Zhuhai,China[J]. Rock and Soil Mechanics,2010,31(7):2017-2023,2029.[7] 刘建锋,徐进,高春玉.土的直剪试验缺陷探讨[J].四川水力发电,2005,24(1):56-59. Liu Jianfeng,Xu Jin,Gao Chunyu. Discussion on Direct Shear Test of Soil Deficiencies[J]. Sichuan Water Power,2005,24(1):56-59.[8] 洪勇,孙涛,栾茂田,等.土工环剪仪的开发及应用研究现状[J].岩土力学,2009,30(3):628-634. Hong Yong,Sun Tao,Luan Maotian,et al. Development and Application of Geotechnical Ring Shear Apparatus:An Overview[J].Rock and Soil Mechanics,2009,30(3):628-634.[9] 土的工程分类标准GB/T 50145-2007[S].北京:中国计划出版社,2008. Standard for Engineering Classification of Soil GB/T 50145-2007[S]. Beijing:China Planning Press,2008.[10] 孙涛,洪勇,栾茂田,等.采用环剪仪对超固结黏土抗剪强度特性的研究[J].岩土力学,2009,30(7):2000-2004. Sun Tao,Hong Yong,Luan Maotian,et al. Shear Strength Behavior of Overconsolidated Clay in Ring Shear Tests[J]. Rock and Soil Mechanics,2009,30(7):2000-2004.[11] 尹占巧,许成顺,刘海桥,等.环剪仪在超固结土残余强度分析中的应用[J].防灾减灾工程学报,2013,33(5):556-572. Yin Zhanqiao,Xu Chengshun,Liu Haiqiao,et al. Application of Ring Shear Apparatus in Analysis of Residual Strength of Over-Consolidated Soil[J]. Journal of Disaster Prevention and Mitigation Engineering,2013,33(5):556-572.[12] Skempton A W. Residual Strength of Clays in Land-slides,Folded Strata and the Laboratory[J]. Geotechnique,1986,35(1):3-18.[13] 刘茂,赵其华.滑带土抗剪强度影响因素及其变化规律综述[J].水利与建筑工程学报,2010,8(6):123-142. Liu Mao,Zhao Qihua. Influencing Factors on Shear Strength of Soils and Their Variation Rules[J]. Journal of Architectural Engineering,2010,8(6):123-142.[14] 卢廷浩,刘祖德.高等土力学[M]. 北京:机械工业出版社,2005. Lu Tinghao,Liu Zude. Advanced Soil Mechanics[M]. Beijing:Machinery Industry Press,2005[15] 戴福初,王思敬,李焯芬,等.香港大屿山残坡积土的残余强度试验研究[J].工程地质学报,1998,6(3):223-229. Dai Fuchu,Wang Sijing,Li Zhuofen,et al. Experimental Study on Residual Strength of Hong Kong Lantau Eluvial Soil[J]. Journal of Engineering Geology,1998,6(3):223-229.[16] 洪勇,许强,郑孝玉.超固结粉质黏土快速大剪切力学特性[J].工程地质学报,2013,21(5):696-701. Hong Yong,Xu Qiang,Zheng Xiaoyu. Mechanical Properties of Over-Consolidated Silty Clay Under Fast Shear Conditions[J]. Journal of Engineering Geology,2013,21(5):696-701.[17] Skempton A W. First-Time Slides in Over-Consolidated Clays[J]. Geotechnique,1970,20(3):320-324. |
[1] | 洪勇, 车效文, 郑孝玉, 刘鹏, 周蓉. 陕西泾阳南塬滑坡干湿黄土快速大剪切力学特性[J]. 吉林大学学报(地球科学版), 2017, 47(4): 1207-1218. |
[2] | 朱杰, 徐颖, 李栋伟, 陈军浩. 泊江海子矿白垩纪地层冻结软岩力学特性试验[J]. 吉林大学学报(地球科学版), 2016, 46(3): 798-804. |
|