考虑裂隙动态变化时裂隙土土水特征曲线的预测方法研究

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摘要裂隙广泛分布于表土中，为土中渗流提供优势通道，导致土中渗透系数增大。裂隙土的土水特征曲线(SWCC)是分析裂隙土渗流问题的关键因素。考虑裂隙的动态变化，提出一种预测裂隙土土水特征曲线的新方法，并通过实例分析对此方法进行试验验证。将裂隙土系统分为裂隙网络系统和土体系统两部分，将相同状态下2种孔隙系统的土水特征曲线组合得到裂隙土在该状态下的土水特征曲线。随着裂隙的开展，可以得到裂隙发展路径上不同状态下裂隙土的土水特征曲线。将裂隙发展路径上不同状态下裂隙土的土水特征曲线进行合理组合，即可得到考虑裂隙动态变化时裂隙土的土水特征曲线。通过室内试验模拟裂隙在土样脱湿过程和吸湿过程中的动态变化，测定脱湿过程中的SWCC，用所提出的方法预测考虑裂隙动态变化时裂隙土的土水特征曲线，并将预测结果与试验结果进行对比。预测和试验结果都显示，裂隙土的土水特征曲线呈双峰特征。在达到土体的进气值之前，曲线由裂隙网络控制；当基质吸力较大时，曲线由土体的SWCC控制。试验结果与理论预测基本一致。

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关键词 ：土力学, 裂隙土, 土水特征曲线, 非饱和土, 渗流

Abstract：Cracks are widely presented in natural and engineered soils. Cracks provide preferential pathways for water flow and significantly increase the hydraulic conductivity of the soil mass. The soil-water characteristic curve(SWCC) for the cracked soil is a key factor in seepage analysis. This paper presents a new method to predict the SWCC for a cracked soil considering the crack development process during drying-wetting cycles. The cracked soil is divided into a crack network system and a soil matrix system. The SWCC for the cracked soil at a specified crack state can be obtained by combining the estimated SWCCs for the two pore systems. Then，the SWCCs for the cracked soil at different crack states along a crack development path can be obtained and combined to give the SWCC for the cracked soil considering the crack development process. The dynamic development of cracks in a soil specimen during drying and wetting and its drying SWCC are also measured in the laboratory. The SWCC for the cracked soil considering the crack development is predicted. The predicted results are verified by test results. The SWCC for the cracked soil shows bimodal features. At low matrix suctions，the SWCC is mainly controlled by the crack network. When the matrix suction is larger than the air-entry value of the soil，the SWCC is mainly controlled by the soil matrix suction.

Key words： soil mechanics cracked soil soil-water characteristic curve unsaturated soil seepage

收稿日期: 2013-01-14

引用本文:

李锦辉1，郭凌波2，张利民3. 考虑裂隙动态变化时裂隙土土水特征曲线的预测方法研究[J]. 岩石力学与工程学报, 2013, 32(6): 1288-1296.
LI Jinhui1，GUO Lingbo2，ZHANG Limin3. PREDICTION OF SWCC FOR UNSATURATED CRACKED SOIL CONSIDERING DEVELOPMENT PROCESS OF CRACKS. , 2013, 32(6): 1288-1296.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I6/1288

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