含水率对结构性参数影响的单变量模型  

Single variable model of water contents on structural parameter impact

作　　者：程大伟[1] 骆亚生[1] 陈茜[1] 郭鸿[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《中南大学学报（自然科学版）》2014年第6期2047-2053,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51178392)

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。Based on confined compression test, the change law of secant modulus and water contents was analyzed with undisturbed and disturbed sample under different pressure conditions, and the expression was obtained. Structural parameters based on the same strain method can be simplified to the structural parameter expression by secant modulus. The single variable model of water contents on structural parameter impact was established by substituting the expression of secant modulus and water contents. The single variable model was verified. The results show that secant modulus of undisturbed and disturbed sample decreases with the increase of the water contents under different pressure conditions. However, due to the obvious existing structural strength, undisturbed sample displays obvious structural strength, and undisturbed sample secant modulus keeps the same value for some different water contents. Structural parameter, which regards water content as the single variable, is able to reflect the change law of soil structure and water content. Under different pressure conditions, structural parameter decreases with the increase of the water contents. But the law of structural parameter and water contents is different with pressure conditions. Under low pressure conditions, structural parameters decrease slowly. Under high pressure conditions, structural parameters decrease significantly. Between these two conditions, structural parameters decrease slightly at first and then decrease dramatically.

关 键 词：结构性 割线模量 含水率 单变量模型 侧限压缩试验 

分 类 号：TU435[建筑科学—岩土工程]