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利用压力板法对乐昌峡坝肩边坡岩土材料的土水特性进行了室内试验研究,测量并分析了含大尺寸块石的强风化岩层的土水特征曲线.首先,对于含大尺寸块石的强风化岩层,本试验依据颗粒级配配比原料,按照一定的干密度制备试样,测量了强风化重塑试样的土水特征曲线,比较了左、右岸强风化岩层的土水特性;其次,测量了全风化原状土和重塑土的土水特征曲线,对比分析了强风化岩层与全风化岩层的土水特性差异,总结了含大尺寸块石强风化材料土水特性的特点,并就试验合理性展开相关讨论;最后,拟合了各种材料的土水特征曲线,得到相关表征各材料土水特性的参数.试验研究表明:影响含大尺寸块石岩土材料土水特性的因素中,颗粒级配的影响明显强于矿物成分的影响;与全风化土质材料相比,含大尺寸块石强风化岩层试样含水量较低,残余含水率偏小,持水能力较弱,且相对于全风化岩层原状试样和重塑试样,强风化岩层重塑试样的土水特性更接近于全风化岩层重塑试样.该试验对含大尺寸块石岩土材料土水特性的试验研究进行了初步探索,试验结果对乐昌峡工程具有一定的指导意义.
The pressure-plate method was used to study the soil-water characteristics of geotechnical materials on the shoulder slope of the Lechang Gorge dam, and the soil-water characteristic curve of the strong weathered rock with large-size blocks was measured and analyzed.Firstly, In this study, we prepared samples according to certain dry density and measured the soil-water characteristic curves of strongly weathered remolded samples. We compared the soil characteristics of the heavily weathered rock layers on the left and right banks Secondly, the soil-water characteristic curves of fully-weathered undrained soil and remolded soil were measured. The differences of soil-water characteristics between strongly weathered rock and fully weathered rock were analyzed. , And discussed the rationality of the experiment.Finally, the soil-water characteristic curves of various materials were fitted and the parameters that characterize the soil-water properties of each material were obtained.The experimental results show that the influence of the soil- Compared with the fully weathered soil material, the grain size of the strongly weathered rock strata containing large-size blocks is lower and the residual moisture content is smaller Water capacity Weak, and with respect to the original weathered rock samples and remodeled samples, the remnants of remolded samples in the strongly weathered rock strata are closer to the remodeled samples of the fully weathered rock strata. The experimental research on the soil-water properties of materials has been tentatively explored. The test results have certain guiding significance for Lechang Gorge Project.