不同土类泥浆脱水固结过程中物理特性研究

发布时间：2018-03-26 06:42

本文选题：压缩系数　切入点：压缩模量　出处：《西北农林科技大学》2016年硕士论文

【摘要】：本论文选用志丹县中粉质壤土和杨凌区重粉质壤土作为试验材料,通过室内试验模拟坝体不同深度处(0m,2m,4m,6m)不同土水比(1.75,2.0,2.25)泥浆脱水固结过程,测定泥浆压缩系数、压缩模量、泥浆含水率和容重等相关指标。通过对比不同外部荷载条件下相同土水比泥浆脱水固结特性,以分析不同深度处泥浆的固结特性的变化规律;通过对比相同外部荷载条件下不同土水比泥浆脱水固结特性,分析不同土水比泥浆脱水固结特性的变化规律;以及对中、重粉质壤土泥浆脱水固结特性进行对比,分析其脱水固结特性与土类的关系。所得结论如下:中、重粉质壤土泥浆相似的变化规律:(1)相同外部荷载条件下不同土水比泥浆的压缩系数具有随着垂直压力的增加而减小的规律,并且在0.025~0.05Mpa压力范围内,泥浆的压缩系数相差显著,当压力范围大于0.05Mpa时,泥浆的压缩系数相差不大。这表明在0.025~0.05Mpa压力范围内泥浆压缩性能受泥浆土水比影响显著,当压力范围大于0.05Mpa时,泥浆的压缩性能受泥浆土水比影响不显著。(2)相同外部荷载条件下不同土水比泥浆的压缩模量具有随着垂直压力的增加而递增的规律,并且在0.025~0.05Mpa压力范围内递增显著,当压力范围大于0.05Mpa时,压缩模量逐渐趋于平缓的直线。(3)不同荷载条件下相同土水比泥浆压缩系数具有随着垂直压力的增加而减小的规律,并且在0.025~0.05Mpa压力范围内,泥浆的压缩系数减小显著,当压力范围大于0.05Mpa时,泥浆的压缩系数变化缓慢。不同荷载条件下相同土水比泥浆的压缩系数呈现为0kPa32kPa64kPa96kPa。(4)不同荷载条件下相同土水比泥浆的压缩模量具有随着垂直压力的增加而递增的规律,并且在0.025~0.05Mpa压力范围内递增显著,当压力范围大于0.05Mpa时,压缩模量趋于平缓的直线。不同荷载条件下相同土水比泥浆其压缩模量呈现为96kPa64kPa32kPa0kPa。中、重粉质壤土泥浆不同的变化规律:(1)中粉质壤土泥浆的压缩系数表现为土水比为2.0土水比为1.75土水比为2.25,压缩模量表现为土水比为2.25土水比为1.75土水比为2.0,这表明土水比为2.0的泥浆压缩性能最好,土水比为1.75的次之,土水比为2.25的最低。(2)重粉质壤土泥浆的压缩系数表现为土水比为2.0土水比为2.25土水比为1.75,压缩模量表现为土水比为1.75土水比为2.25土水比为2.0,这表明土水比为2.0的泥浆压缩性能最好,土水比为2.25的次之,土水比为1.75的最低。(3)重粉质壤土泥浆(土水比为2.0)的压缩系数大于中粉质壤土泥浆(土水比为2.0)的压缩系数,重粉质壤土泥浆的压缩模量小于中粉质壤土泥浆的压缩模量。这表明重粉质壤土泥浆的压缩性能高于中粉质壤土泥浆的压缩性能。
[Abstract]:This paper selects Zhidan County in Yangling District heavy silty loam and silty loam as test materials, through laboratory simulation of dam at different depths (0m, 2m, 4m, 6m) in different soil water ratio (1.75,2.0,2.25) determination process of dewatering and consolidation of mud, mud compression coefficient, compression modulus, indexes of mud water content and bulk density the same soil water. Through the comparison of different external loading conditions than the dewatering and consolidation of mud properties, to change the law of consolidation characteristics of different depth of mud; different soil water by comparing the same external load conditions than slurry dewatering consolidation characteristics, analysis of different soil water ratio variation of dewatering and consolidation of mud properties; and, heavy silt loam dewatering and consolidation of mud properties were compared, analysis of the relationship between the dehydration and consolidation characteristics of soil types. The conclusions are as follows: in the heavy silt loam mud variation similar to: (1) the same external Different soil water load conditions than the compression coefficient with mud with increasing vertical pressure and decreases, and in the 0.025~0.05Mpa pressure range, the compression coefficient of mud is significant, when the pressure range is more than 0.05Mpa, the compression coefficient of mud has little difference. This shows that in the 0.025~0.05Mpa pressure range compression performance by mud mud soil the water ratio, when the pressure range is more than 0.05Mpa, the compression performance of mud mud soil water ratio is not significantly affected. (2) different soil water conditions than the same external load compression modulus with the increase of mud with vertical pressure and the regularity of increasing, and in the 0.025~0.05Mpa pressure range increased significantly, when the pressure the range is more than 0.05Mpa, the compression modulus gradually flatten the line. (3) the same soil water under different loading conditions has increased with the vertical pressure ratio of the compression coefficient of mud The reduction of the law, and in the 0.025~0.05Mpa pressure range, the compression coefficient of mud decreases significantly, when the pressure range is more than 0.05Mpa, the compression coefficient changes slowly. The same mud soil water under different loading conditions are presented for the 0kPa32kPa64kPa96kPa. than the compressibility of mud (4) the same soil water under different loading conditions has increased with the vertical the pressure of the rule than compressive modulus of the mud, and in the 0.025~0.05Mpa pressure range increased significantly, when the pressure range is more than 0.05Mpa, the compression modulus tends to be gentle straight. The same soil water under different loading conditions is 96kPa64kPa32kPa0kPa. than the compression modulus variation of mud, heavy silt loam mud is different: (1) compression the coefficient of performance in silty loam mud for soil water ratio of 2 soil water ratio of 1.75 soil water ratio was 2.25, compression modulus showed soil water ratio of soil water ratio is 2.25 1.75 soil water ratio is 2, which indicates that the soil water ratio of 2 mud compression performance best, soil water ratio is 1.75 times, the soil water ratio of 2.25 was the lowest. (2) compression coefficient of heavy silt loam soil water slurry ratio of 2 soil water ratio of 2.25 soil water ratio 1.75, compression modulus showed the soil water ratio of 1.75 soil water ratio of 2.25 soil water ratio is 2, which indicates that the soil water ratio of 2 mud compression performance best, soil water ratio is 2.25 times, the soil water ratio of 1.75 was the lowest. (3) heavy silt loam soil (mud than water 2) the compression coefficient is larger than in the silty loam soil (mud soil water ratio is 2) compression coefficient, compression modulus of heavy silt loam mud compression modulus is less than in the silty loam mud. It is proved that the compression performance of heavy silt loam mud than in silty loam mud.

【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU411.2

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