非饱和重塑弱膨胀土孔隙结构与土–水特征曲线试验研究

doi:10.13722/j.cnki.jrme.2021.0277

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摘要为研究压实程度对非饱和重塑弱膨胀土孔隙结构的影响，探讨膨胀土孔隙结构改变对土–水特征曲线的影响。以新疆哈密地区重塑膨胀土为研究对象，采用压汞试验测定压实程度对土样的微观孔隙结构影响，并利用热力学关系模型对膨胀土分形维数进行研究；采用滤纸法试验测量不同初始干密度下重塑土样的土–水特征曲线，提出可考虑压实作用影响的膨胀土土–水特征曲线双参数拟合模型，最后，基于土体孔隙特征，借助毛细管原理计算并结合滤纸法试验数据修正其土–水特征曲线。研究结果表明：随压实程度的增加，新疆哈密地区非饱和弱膨胀土孔隙呈初始三峰状并逐渐趋于双峰状分布，其在微观上表现为大孔隙的压缩引起的大孔隙向小孔隙的转化，孔隙内壁的粗糙程度及孔隙结构的复杂程度提高；土体基质吸力随含水率的增加而降低，相同体积含水率下，土体初始干密度越大，基质吸力越大，双参数模型可较好反映土体初始干密度对膨胀土土–水特征曲线发展规律的影响；基于毛细管原理的土–水特征曲线计算值同滤纸法实测曲线有相同函数模型发展规律，且随试样初始干密度的增加两者呈逐渐“远离”趋势发展；土–水特征曲线修正模型可统一描述非饱和弱膨胀土基质吸力随孔隙结构、含水率及密度状态的发展规律。

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	丁小刚1
	马丽娜1
	2
	蔺文博1
	金依蕊1
	李岳超1
	王志强1

关键词 ：土力学, 非饱和膨胀土, 压汞法, 滤纸法, 微观孔隙结构, 土&ndash, 水特征曲线

Abstract：To study the effect of compaction degree on the pore structure of unsaturated remolded weak expansive soil，and to investigate the influence of the change of pore structure of expansive soil on the soil-water characteristic curve(SWCC). Taking the remolded expansive soil in Hami of Xinjiang as the research object，the mercury intrusion test was used to determine the impact of compaction on the microscopic pore structure of the soil sample，and use the thermodynamic relationship model to study the fractal dimension of expansive soil. The pressure plate instrument and filter paper method were used to test the soil of the remodeled soil sample under different dry densities-water characteristic curve. The expansive soil SWCC two-parameter fitting model that can consider the effects of compaction is proposed. Finally，based on the pore characteristics of the mercury intrusion test，the soil-water characteristic curve is corrected with the help of the capillary principle to calculate and combine the test data of the filter paper method. The results show that as the degree of compaction increases，the pore distribution curve of expansive soil presents an initial Trimodal distribution and gradually tends to be bimodal. The compaction effect is manifested in the microscopically as the conversion of large pores to small pores caused by the compression of large pores. The fractal characteristics of pores show that compaction has increased the roughness of the inner wall of the pore and the complexity of the pore structure. The suction of the soil matrix decreases with the increase of water content. Under the same volumetric water content，the greater the initial dry density of the soil，the greater the suction of the matrix. The two-parameter model can better reflect the influence of the initial dry density of the soil on the development law of the soil-water characteristic curve of the expansive soil. The calculated value of the soil-water characteristic curve based on the capillary principle has the same function model development law as the actual measured curve of the filter paper method，and the two tend to gradually“far away”as the initial dry density of the sample increases. The modified soil-water characteristic curve model can uniformly describe the development law of the matrix suction of the unsaturated weakly expansive soil with the pore structure，water content and density state.

Key words： soil mechanics unsaturated expansive soil mercury intrusion porosimetry filter paper method microscopic pore structure soil-water characteristic curve

引用本文:

丁小刚1，马丽娜1，2，蔺文博1，金依蕊1，李岳超1，王志强1. 非饱和重塑弱膨胀土孔隙结构与土–水特征曲线试验研究[J]. 岩石力学与工程学报, 2022, 41(S1): 3081-3090.
DING Xiaogang1，MA Lina1，2，LIN Wenbo1，JIN Yirui1，LI Yuechao1，WANG Zhiqiang1. Experimental study on the pore structure and soil-water characteristic curve of unsaturated remolded weak expansive soil. , 2022, 41(S1): 3081-3090.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0277 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/3081

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