干密度和初始含水率对珊瑚砂持水性的影响研究

doi:10.13722/j.cnki.jrme.2023.1037

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摘要为研究干密度和初始含水率对珊瑚砂持水性的影响，开展压力板脱湿试验对不同干密度和初始含水率试样的土–水特征曲线进行测试分析，并通过核磁共振技术获取试样在不同吸力下的孔隙水分布特征。试验结果表明：珊瑚砂的进气值随干密度的增大而增大，随初始含水率的升高而减小；残余含水率随干密度和初始含水率的增大而增大，总体来说，干密度大、初始含水率高的试样持水性更好；F‐X模型对不同条件下珊瑚砂试样的土–水特征曲线具有较好适用性；干密度和初始含水率对压实珊瑚砂试样的孔隙大小分布和持水性具有重要影响，但随基质吸力增大，两者对珊瑚砂持水性的影响在逐渐减弱；在不同吸力阶段内，干密度和初始含水率对珊瑚砂持水性的影响规律存在差异，在0～10 kPa下，初始含水率作为主要影响因素，10～70 kPa下，干密度的影响更大，在70～300 kPa下，两者均不对珊瑚砂的持水性产生主要影响；珊瑚砂孔隙连通性差，致使大孔隙在高吸力下仍可储存水分，这在一定程度上增强了珊瑚砂的持水性。

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	吴昊1
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	沈建华1
	雷学文2
	陈翔3
	丁浩桢1
	王新志1

关键词 ：土力学, 珊瑚砂, 持水特性, 核磁共振, 孔隙水分布

Abstract：In order to study the effects of dry density and initial water content on water retention of coral sand，soil-water characteristic curves of samples with different dry densities and initial water contents were tested and analyzed by pressure plate apparatus test，and the pore water distribution characteristics of samples under different suction forces were obtained by nuclear magnetic resonance technology. The results show that the air entry value of coral sand increases with the increase of dry density and decreases with the increase of initial water content. The residual water content increases with the increase of dry density and initial water content. In general，the samples with high dry density and initial water content have better water retention. The F‐X model has good applicability to soil-water characteristic curves of coral sand samples under different conditions. Dry density and initial water content have important effects on pore size distribution and water retention of compacted coral sand samples，but their effects on water retention gradually weaken with the increase of matric suction. At different suction stages，the effects of dry density and initial water content on water retention of coral sand were different. At 0–10 kPa，the initial water content was the main factor，while at 10–70 kPa，the dry density had a greater effect，and at 70–300 kPa，neither of them had a major effect on water retention of coral sand. The poor connectivity of coral sand pores results in large pores that can still store water under high suction，which enhances the water retention of coral sand to a certain extent.

Key words： soil mechanics coral sand water retention characteristics nuclear magnetic resonance pore water distribution

引用本文:

吴昊1，2，沈建华1，雷学文2，陈翔3，丁浩桢1，王新志1. 干密度和初始含水率对珊瑚砂持水性的影响研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3568-3577.
WU Hao1，2，SHEN Jianhua1，LEI Xuewen2，CHEN Xiang3，DING Haozhen1，WANG Xinzhi1. Effects of dry density and initial water content on water retention of coral sand. , 2024, 43(S1): 3568-3577.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1037 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3568

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