EXPERIMENTAL RESEARCH ON MECHANICS CHARACTERISTICS AND MECHANISM OF SILTY SOIL MODIFIED BY POLYMER MATERIAL
DONG Jinmei1,2,ZHU Hua1,BIAN Jiang1,GAO Hongmei1
(1. School of Transportation Nanjing University of Technology,Nanjing,Jiangsu 210096,China;2. Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China)
Abstract:Silty soil is modified by polymer material from aspects to improve water stability. Indoor direct shear test and unidirectional compression test were conducted to research shearing strength and compressive deformation characteristics before and after submerging. Testing results show that (1) J1–6 proportion silty soil,compared with common silty soil,has a better shearing strength. After submerged,PAM cohesion polymerization decreases,and strength decreases. Compression deformation is great because PAM is capable of playing a role in lubrication. (2) G2–5 proportion silty soil can improve shearing strength at some extent and reduce compression deformation. After submerged,crumb structure and aggregated structure are desctroyed. Decreased strength,increased deformation and bad hydrolytic resistance are showed. (3) Because of combined action of sodium silicate and PAM,GJ6–9 proportion modified silty soil has a high polymer material protection layer on the surface,which greatly improve the cohesion and internal friction angle and also has a better hydrolytic resistance and less deformation. Through the research of effects of modifying agents and its mixture amount as well as submerging conditions on shear strength and compressive deformation,the best proportion is determined and degradation behavior under submerging condition is grasped.
朱志铎,郝建新,赵黎明. 交通荷载作用下粉土路基变形特性分析[J]. 地下空间与工程学报,2009,5(5):1013-1020.(ZHU Zhiduo,HAO Jianxin,ZHAO Liming. Deformation characteristics of silt subgrade under traffic loads[J]. Chinese Journal of Underground Space and Engineering,2009,5(5):1013-1020.(in Chinese))
[2]
宋修广,张宏博,王松根,等. 黄河冲积平原区粉土路基吸水特性及强度衰减规律试验研究[J]. 岩土工程学报,2010,32(10):1594-1603.(SONG Xiuguang,ZHANG Hongbo,WANG Songgen,et al. Hydrophilic characteristics and strength decay of silt roadbed inYellow River alluvial plain[J]. Chinese Journal of Geotechnical Engineering,2010,32(10):1594-1603.(in Chinese))
[3]
肖军华,刘建坤,彭丽云,等. 黄河冲积粉土的密实度及含水率对力学性质影响[J]. 岩土力学,2008,29(2):409-415.(XIAO Junhua,LIU Jiankun,PENG Liyun,et al. Effects of compactness and water Yellow-River alluvial silt content on its mechanical behaviors[J]. Rock and Soil Mechanics,2008,29(2):409-415.(in Chinese))
[4]
和法国,谌文武,韩文峰,等. 高分子材料SH 固沙性能与微结构相关性研究[J]. 岩土力学,2009,30(12):3803-3809.(HE Faguo,CHEN Wenwu,HAN Wenfeng,et al. Correlation of microstructure indices and performanceof sand solidified with polymer material SH[J]. Rock and Soil Mechanics,2009,30(12):3803-3809.(in Chinese))
[5]
NADLER A,PERFECT E,KAY B D. Effect of polyacrylamide application on the stability of dry and wet aggregates[J]. Soil Science Society of America Journal,1996,60(2):555-561.
[6]
LEVY G J,MILLER W P. Polyacrylamide adsorption and aggregate stability[J]. Soil and Tillage Research,1999,51(1):121-128.
[7]
KUKAL S S,MANMEET KAUR,BAWA S S,et al. Water -drop stability of PVA2treated natural soil aggregates from different land uses[J]. Catena,2007,70(3):475-479.
[8]
黄 河,施 斌,刘 瑾,等. STW型生态土壤稳定剂改性膨胀土水理性质试验研究[J]. 岩土工程学报,2008,30(8):1236-1240.(HUANG He,SHI Bin,LIU Jin,et al. Water-physical properties of expansive soils modified by STW ecotypic soil stabilizer[J]. Chinese Journal of Geotechnical Engineering,2008,30(8):1236-1240.(in Chinese))
[9]
柴寿喜,王沛,韩文峰,等. 高分子材料固化滨海盐渍土的强度与微结构研究[J].岩土力学,2007,28(6):1067-1073.(CHAI Shouxi,WANG Pei,HAN Wenfeng,et al. Research on strength and microstructure feature of solidified saline soil in inshore with polymer[J]. Rock and Soil Mechanics,2007,28(6):1067-1073.(in Chinese))
[10]
李志清,胡瑞林,王立朝,等. 阳离子改性剂改良膨胀土试验研究[J]. 岩土工程学报,2009,31(7):1094-1099.(LI Zhiqing,HU Ruilin,WANG Lichao,et al. Experimental study on expansive soil improved with caption modifier[J]. Chinese Journal of Geotechnical Engineering,2009,31(7):1094-1099.(in Chinese))
[11]
刘清秉,项伟,崔德山,等. 离子土固化剂改良膨胀土的机制研究[J]. 岩土工程学报,2011,33(4):648-655.(LIU Qingbing,XIANG Wei,CUI Deshan,et al. Mechanism of expansive soil improved by ionic soil stabilizer[J]. Chinese Journal of Geotechnical Engineering,2011,33(4):648-655.(in Chinese))
[12]
董金梅,徐洪钟,朱定华,等. 不同水环境下高分子材料改性粉土的试验研究[J]. 岩土工程学报,2013,35(7):1316-1322.(DONG Jinmei,XU Hongzhong,ZHU Dinghua,et al. Experimental on silty soil modified by polymer material under varying water environments[J].Chinese Journal of Geotechnical Engineering,2013,35(7):1316- 1322.(in Chinese))
[13]
李晓生,李荣江,刘喜军. 硅酸钠对水泥抗渗性的影响[J]. 齐齐哈尔大学学报,2011,27(6):49-51.(LI Xiaosheng,LI Rongjiang,LIU Xijun. The influence of sodium silicate on the impermeability of cement[J]. Journal of Qiqihar University,2011,27(6):49-51.(in Chinese))