石屑改良膨胀土的剪切特性试验研究
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摘要
为了研究石屑作为膨胀土物理改良材料的可行性,通过直剪试验研究了石屑掺量、初始干密度对石屑改良膨胀土的抗剪强度及其指标的影响。结果表明:石屑可显著改善膨胀土的抗剪切性能,但石屑掺量、初始干密度对膨胀土的抗剪强度参数和抗剪强度的影响各异。过大的石屑掺量会降低膨胀土的黏聚力,提高膨胀土的内摩擦角,但降低膨胀土的抗剪强度。提高初始干密度可提高膨胀土的黏聚力、内摩擦角和抗剪强度。在石屑改良膨胀土路基施工中,适宜的石屑掺量和较高的压实度,对提高石屑改良膨胀土路基施工质量有利。
In order to research the feasibility of aggregate chip to improve physical properties of expansive soil, the effect of aggregate chip content and initial dry density on the shear strength and other index of aggregate chip improved expansive soil was studied by indoor direct shear test, respectively. The result shows that aggregate chip may greatly improve the shearing resistance performance of expansive soil, while the effects of chip content and initial dry density on the shear strngth with the respective influencing mechanism are different. When the chip mixed, the expansive soil's cohesion decreases, the internal friction angle increases, and the shear strength reduced. The initial dry density may increase the cohesion, internal friction angle and shear strength. For the subgrade construction in chip-improved expansive soil, proper chip content and relatively high compaction degree are good to enhance the quality of the construction therein.
In order to research the feasibility of aggregate chip to improve physical properties of expansive soil, the effect of aggregate chip content and initial dry density on the shear strength and other index of aggregate chip improved expansive soil was studied by indoor direct shear test, respectively. The result shows that aggregate chip may greatly improve the shearing resistance performance of expansive soil, while the effects of chip content and initial dry density on the shear strngth with the respective influencing mechanism are different. When the chip mixed, the expansive soil's cohesion decreases, the internal friction angle increases, and the shear strength reduced. The initial dry density may increase the cohesion, internal friction angle and shear strength. For the subgrade construction in chip-improved expansive soil, proper chip content and relatively high compaction degree are good to enhance the quality of the construction therein.
引文
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[11] 黄震,陈铖.改良膨胀土胀缩裂隙及与抗剪强度的关系研究[J].水文地质工程地质,2016,43(3):87-93.HUANG Z,CHEN C.A study of the swelling shrinkage cracks of the modified expansive soil and its relationship with the shear strength[J].Hydrogeology & Engineering Geology,2016,43(3):87-93.
[12] 韩晶,王乐华,马莉,等.水泥及石灰掺量对改良膨胀土抗剪强度的影响[J].人民黄河,2015,37(4):137-139,144.HAN J,WANG L H,MA L,et al.Effect on shear strength of improved expansive soil with addition amounts of cement and lime[J].Yellow River,2015,37(4):137-139,144.
[13] 李新明,孔令伟,郭爱国,等.基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究[J].岩土力学,2014,35(3):675-682.LI X M,KONG L W,GUO A G,et al.Experimental research on shear strength of expansive soil under wetting-drying cycles based on wrapping method[J].Rock and Soil Mechanics,2014,35(3):675-682.
[14] 边加敏,蒋玲,王保田.石灰改良膨胀土抗剪强度参数试验研究[J].长江科学院院报,2012,29(12):62-67.BIAN J M,JIANG L,WANG B T.Shear strength parameters of lime-treated expansive soils[J].Journal of Yangtze River Scientific Research Institute,2012,29(12):62-67.
[15] 沈泰宇,邢书香,汪时机,等.降低强膨胀土膨胀率提高抗剪强度的复合改良剂筛选[J].农业工程学报,2017,33(2):109-115.SHEN T Y,XING S X,WANG S J,et al.Complex ameliorants screening for reducing swelling ratio and improving shear strength of strong expansive soil[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(2):109-115.
[16] 孙树林,魏永耀,张鑫.废弃轮胎胶粉改良膨胀土的抗剪强度研究[J].岩石力学与工程学报,2009,28(增刊1):3070-3075.SUN S L,WEI Y Y,ZHANG X.Research on shear strength of expansive soils reinforced with waste tire powders[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3070-3075.
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[2] 范永丰.有限淋滤作用下石灰处治膨胀土的力学性能[J].上海交通大学学报,2013,47(9):1390-1394.FAN Y F.Experimental study of mechanical properties of lime stabilized expansive soil under the condition of eluviations[J].Journal of Shanghai Jiaotong University,2013,47(9):1390-1394.
[3] 周葆春,孔令伟,郭爱国.石灰改良膨胀土的应力-应变-强度特征与本构描述[J].岩土力学,2012,33(4):999-1005.ZHOU B C,KONG L W,GUO A G.Stress-strain-strength behaviour and constitutive description of lime-treated expansive soil[J].Rock and Soil Mechanics,2012,33(4):999-1005.
[4] 杨俊,童磊,张国栋,等.初始含水率和改良材料掺量对膨胀土抗剪强度的影响[J].水利水电科技进展,2014,34(3):39-43,49.YANG J,TONG L,ZHANG G D,et al.Effect of initial moisture content and improved material amount on shear strength of expansive soil[J].Advances in Science and Technology of Water Resources,2014,34(3):39-43,49.
[5] 杨俊,杨志,张国栋,等.初始干密度及掺砂比对膨胀土抗剪强度指标影响[J].地下空间与工程学报,2015,11(1):77-83.YANG J,YANG Z,ZHANG G D,et al.The influence of initial dry density and doped sand proportion on expansive soil shear strength[J].Chinese Journal of Underground Space and Engineering,2015,11(1):77-83.
[6] 杨俊,童磊,许威,等.冻融循环影响风化砂改良膨胀土抗剪强度室内试验研究[J].工程地质学报,2015,23(1):65-71.YANG J,TONG L,XU W,et al.Laboratory research on effect of freeze-thaw cycles to shear strength of weathered sand improved with expansive soil[J].Journal of Engineering Geology,2015,23(1):65-71.
[7] 杨俊,童磊,张国栋,等.干湿循环效应对风化砂改良膨胀土抗剪强度影响研究[J].长江科学院院报,2014,31(4):39-44.YANG J,TONG L,ZHANG G D,et al.Influence of wet-dry cycles on the shear strength of expansive soil modified by weathered sand[J].Journal of Yangtze River Scientific Research Institute,2014,31(4):39-44.
[8] 杨俊,童磊,张国栋,等.不同垂直荷重对风化砂改良膨胀土抗剪强度影响研究[J].工程地质学报,2013,21(4):591-597.YANG J,TONG L,ZHANG G D,et al.Effects of different vertical loads on shear strength of weathered sand modified expansive soil[J].Journal of Engineering Geology,2013,21(4):591-597.
[9] 杨俊,童磊,张国栋.垂直荷重对不同材料改良膨胀土抗剪强度影响研究[J].西北大学学报(自然科学版),2014,44(4):621-628.YANG J,TONG L,ZHANG G D.Vertical load's impact on shear strength of the lime,cement and fly ash improved expansive soil[J].Journal of Northwest University(Natural Science),2014,44(4):621-628.
[10] 杨俊,杨志,张国栋,等.初始干密度对不同材料改良膨胀土的抗剪指标影响[J].暨南大学学报(自然科学版),2013,34(5):500-506.YANG J,YANG Z,ZHANG G D,et al.Initial dry density on the shear effect of different material improved expansive soil[J].Journal of Jinan University(Natural Science),2013,34(5):500-506.
[11] 黄震,陈铖.改良膨胀土胀缩裂隙及与抗剪强度的关系研究[J].水文地质工程地质,2016,43(3):87-93.HUANG Z,CHEN C.A study of the swelling shrinkage cracks of the modified expansive soil and its relationship with the shear strength[J].Hydrogeology & Engineering Geology,2016,43(3):87-93.
[12] 韩晶,王乐华,马莉,等.水泥及石灰掺量对改良膨胀土抗剪强度的影响[J].人民黄河,2015,37(4):137-139,144.HAN J,WANG L H,MA L,et al.Effect on shear strength of improved expansive soil with addition amounts of cement and lime[J].Yellow River,2015,37(4):137-139,144.
[13] 李新明,孔令伟,郭爱国,等.基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究[J].岩土力学,2014,35(3):675-682.LI X M,KONG L W,GUO A G,et al.Experimental research on shear strength of expansive soil under wetting-drying cycles based on wrapping method[J].Rock and Soil Mechanics,2014,35(3):675-682.
[14] 边加敏,蒋玲,王保田.石灰改良膨胀土抗剪强度参数试验研究[J].长江科学院院报,2012,29(12):62-67.BIAN J M,JIANG L,WANG B T.Shear strength parameters of lime-treated expansive soils[J].Journal of Yangtze River Scientific Research Institute,2012,29(12):62-67.
[15] 沈泰宇,邢书香,汪时机,等.降低强膨胀土膨胀率提高抗剪强度的复合改良剂筛选[J].农业工程学报,2017,33(2):109-115.SHEN T Y,XING S X,WANG S J,et al.Complex ameliorants screening for reducing swelling ratio and improving shear strength of strong expansive soil[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(2):109-115.
[16] 孙树林,魏永耀,张鑫.废弃轮胎胶粉改良膨胀土的抗剪强度研究[J].岩石力学与工程学报,2009,28(增刊1):3070-3075.SUN S L,WEI Y Y,ZHANG X.Research on shear strength of expansive soils reinforced with waste tire powders[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3070-3075.
[17] JTGF10—2006 公路路基施工技术规范[S].北京:人民交通出版社,2006.JTGF10—2006 Technical Specification for Construction of Highway Subgrades[S].Beijing:China Communications Press,2006.
[18] JTGD30—2015 公路路基设计规范[S].北京:人民交通出版社,2015.
[19] JTGE40—2007 公路土工试验规程[S].北京:人民交通出版社,2007.JTGE40—2007 Test Methods of Soils for Highway Engineering[S].Beijing:China Communications Press,2007.