含水率对结构性参数影响的单变量模型

发布时间：2018-04-24 07:26

本文选题：结构性 + 割线模量　；参考：《中南大学学报(自然科学版)》2014年06期

【摘要】：基于侧限压缩试验分析不同压力条件下原状样和重塑样的割线模量随含水率变化规律,获取割线模量与含水率关系的表达式。基于应变的结构性参数可化简为以割线模量为参量的结构性参数,并将割线模量与含水率关系式代入即可构建含水率对结构性参数影响的单变量模型。最后检验含水率对结构性参数影响的单变量模型。研究结果表明:不同压力条件下原状样和重塑样的割线模量均随含水率增大而呈递减趋势,但由于原状样存在明显的结构强度,不同压力下原状样割线模量与含水率关系曲线存在交叉;采用含水率作为单变量描述的结构性参数能够直观地反映土体结构性随含水率的变化规律;不同压力条件下结构性参数随含水率的增大呈递减趋势,但随着压力条件的不同,这种递减趋势存在差异。当压力较小时,结构性参数随含水率递减的趋势较平缓;当压力较大时,结构性参数随含水率递减的趋势是快速递减;在这两者之间则呈现出先平缓递减后快速递减的过渡状态。
[Abstract]:The relationship between Secant modulus and moisture content was obtained by analyzing the variation of Secant modulus with water content under different pressure conditions based on the side limit compression test. The structural parameters based on strain can be simplified as structural parameters with Secant modulus as parameter, and the univariate model of the influence of moisture content on structural parameters can be constructed by inserting the relationship between Secant modulus and moisture content. Finally, the univariate model of the effect of water content on structural parameters is tested. The results show that the Secant modulus of the undisturbed and remolded samples decrease with the increase of water content under different pressure conditions, but the structural strength of the original samples is obvious. The curves of the relationship between Secant modulus and moisture content of undisturbed samples are intersected under different pressures, and the structural parameters described by using moisture content as a single variable can directly reflect the variation law of soil structure with water content. Under different pressure conditions, the structural parameters decrease with the increase of water content, but with the different pressure conditions, the decline trend is different. When the pressure is small, the trend of structural parameters decreasing with water content is relatively gentle, and when the pressure is high, the trend of structural parameters decreasing with water content is fast decreasing. Between the two, there is a transition state of gradual decline and then rapid decline.
【作者单位】：西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金资助项目(51178392)
【分类号】：TU435

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