膨胀土膨胀变形试验研究
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摘要
为了研究不同注水方式对膨胀土膨胀量的影响,以及大尺寸重塑膨胀土浸水膨胀的变化规律,取某高速铁路地基膨胀泥岩重塑土样,进行开孔与不开孔的膨胀土浸水膨胀试验,并对不同厚度的大尺寸膨胀土试样进行浸水膨胀变形试验。试验结果表明:开孔注水与不开孔注水的膨胀土膨胀时程曲线有很大不同,开孔注水的土样膨胀时程曲线可以分为初始快速膨胀、减速膨胀、趋于稳定3个阶段;不开孔注水的土样膨胀时程曲线可分为初始缓慢膨胀、快速膨胀、减速膨胀和趋于稳定阶段4个阶段。分析得到土样损失体积率与膨胀量损失量的关系。不同厚度的大尺寸膨胀土试样膨胀时程曲线整体呈外凸形增长趋势,并且每级注水后,膨胀量也呈外凸形增长趋势;大尺寸膨胀土试样的真实膨胀量随着厚度的增加而增大,但增幅减小,真实膨胀量随着上覆荷载的增大而减小,减幅也降低。
Expansive soil stone remoulded samples from the base of an expressway were taken for opening and nonopening expansive soil water immersion expansion test and large-scale expansive soil samples with different thicknesses were taken for water immersion expansive deformation test in order to study the influence of different modes of water injections on the expansion increment of expansive soil and the change rule of immersion expansion of large-scale remoulded expansive soil. The test results show that the expansion time interval curve of the expansive soil injected with water through opening and non-opening way is largely different. To be specific,the expansion time interval curve of the soil sample injected with water through opening way can be generally divided into three stages: initial fast expansion stage,decelerated expansion stage and stable expansion stage; on contrast,the expansion time interval curve of the other one through non-opening way can be divided into four stages: initial slow expansion stage, fast expansion stage, decelerated expansion stage and stable expansion stage. The relationship between soil sample loss volume fraction and expansion increment loss is analyzed to be Δδ = 0. 617ΔV +0. 02. The expansion time interval curve of the large-scale expansive soil sample with different thicknesses is in a convex growth trend,so is the expansion increment after the water injection of each grade. The real expansion increment of the large-scale expansive soil sample will increase along with the increase of thickness but the amplitude of increase declines. The real expansion increment will decline along with the increase of overlying load,but the amplitude of increase declines.
Expansive soil stone remoulded samples from the base of an expressway were taken for opening and nonopening expansive soil water immersion expansion test and large-scale expansive soil samples with different thicknesses were taken for water immersion expansive deformation test in order to study the influence of different modes of water injections on the expansion increment of expansive soil and the change rule of immersion expansion of large-scale remoulded expansive soil. The test results show that the expansion time interval curve of the expansive soil injected with water through opening and non-opening way is largely different. To be specific,the expansion time interval curve of the soil sample injected with water through opening way can be generally divided into three stages: initial fast expansion stage,decelerated expansion stage and stable expansion stage; on contrast,the expansion time interval curve of the other one through non-opening way can be divided into four stages: initial slow expansion stage, fast expansion stage, decelerated expansion stage and stable expansion stage. The relationship between soil sample loss volume fraction and expansion increment loss is analyzed to be Δδ = 0. 617ΔV +0. 02. The expansion time interval curve of the large-scale expansive soil sample with different thicknesses is in a convex growth trend,so is the expansion increment after the water injection of each grade. The real expansion increment of the large-scale expansive soil sample will increase along with the increase of thickness but the amplitude of increase declines. The real expansion increment will decline along with the increase of overlying load,but the amplitude of increase declines.
引文
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[2]宋迎俊,许雷,鲁洋,等.基于正交设计的膨胀土冻融循环试验研究[J].水利水运工程学报,2017(2):51-58.(SONGYingjun,XU Lei,LU Yang,et al.Experimental studies on freeze-thaw cycles of expansive soil based on orthogonal design[J].Hydro-Science and Engineering,2017(2):51-58.(in Chinese))
[3]张路,樊恒辉,车雯方,等.黑龙江地区渠道基土工程性质试验分析[J].水利水运工程学报,2018(2):82-90.(ZHANGLu,FAN Henghui,CHE Wenfang,et al.Experimental analysis of engineering properties of foundation soil of canal works in Heilongjiang area[J].Hydro-Science and Engineering,2018(2):82-90.(in Chinese))
[4]徐永福,龚友平,殷宗泽.宁夏膨胀土膨胀变形特征的试验研究[J].水利学报,1997(9):27-30.(XU Yongfu,GONGYouping,YIN Zongze.Tests on swelling deformation of expansive soils[J].Journal of Hydraulic Engineering,1997(9):27-30.(in Chinese))
[5]刘静德,李青云,龚壁卫.南水北调中线膨胀岩膨胀特性研究[J].岩土工程学报,2011,33(5):826-830.(LIU Jingde,LI Qingyun,GONG Biwei.Swelling properties of expansive rock in Middle Route Project of South-to-North Water Diversion[J].Chinese Journal of Geotechnical Engineering,2011,33(5):826-830.(in Chinese))
[6]谭罗荣,孔令伟.膨胀土膨胀特性的变化规律研究[J].岩土力学,2004,25(10):1554-1559.(TAN Luorong,KONGLingwei.Study on variation regularity of swelling behavior of expansive soil[J].Rock and Soil Mechanics,2004,25(10):1554-1559.(in Chinese))
[7]韦秉旭.侧限条件下膨胀土膨胀变形试验研究[J].公路交通科技,2007,24(10):48-52.(WEI Bingxu.Experimental research on lateral restricted swelling strain of expansive soil[J].Journal of Highway and Transportation Research and Development,2007,24(10):48-52.(in Chinese))
[8]丁振洲,郑颖人,李利晟.膨胀力变化规律试验研究[J].岩土力学,2007,28(7):1328-1332.(DING Zhenzhou,ZHENGYingren,LI Lisheng.Trial study on variation regularity of swelling force[J].Rock and Soil Mechanics,2007,28(7):1328-1332.(in Chinese))
[9]陈伟志,蒋关鲁,袁泽华,等.低矮路堤下膨胀土地基现场浸水试验研究[J].岩土力学与工程学报,2014,33(8):1609-1618.(CHEN Weizhi,JIANG Guanlu,YUAN Zehua,et al.Field soaking tests on expansive soil foundation under low embankment[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(8):1609-1618.(in Chinese))
[10]杨果林,滕珂,秦朝辉.膨胀土侧向膨胀力原位试验研究[J].中南大学学报(自然科学版),2014,45(7):2326-2332.(YANG Guolin,TENG Ke,QIN Zhaohui.An in-situ experimental research of lateral swelling pressure on expansive soils[J].Journal of Central South University(Science and Technology),2014,45(7):2326-2332.(in Chinese))
[11]马丽娜,严松宏,王起才,等.客运专线无碴轨道泥岩地基原位浸水膨胀变形试验[J].岩石力学与工程学报,2015,34(8):1684-1691.(MA Lina,YAN Songhong,WANG Qicai,et al.In-situ tests on swelling deformation of mudstone foundation upon soaking under ballastless track of passenger railway line[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(8):1684-1691.(in Chinese))
[12]王亮亮,杨果林.中-强膨胀土竖向膨胀力原位试验[J].铁道学报,2014,36(1):94-99.(WANG Liangliang,YANGGuolin.In-situ tests of vertical swelling pressures of mid-strong expansive soil[J].Journal of the China Railway Society,2014,36(1):94-99.(in Chinese))