试样边壁及内部缺陷对土体渗透系数测量的影响分析

发布时间：2018-05-21 04:00

本文选题：渗透系数 + 渗透试验　；参考：《中国水利水电科学研究院学报》2017年04期

【摘要】：土体的渗透系数是评价土体渗透固结性能的重要指标。在心墙坝中,准确测定心墙料的渗透系数对评价心墙的固结变形和拱效应具有非常重要的意义。测量渗透系数的方法包括渗透试验和固结试验。由于试样边壁和内部缺陷的影响,这两种方法的测量结果均可能与实际土体的渗透系数存在一定偏差。本文通过对概念模型的理论分析和推导计算,研究了试样边壁和内部缺陷对渗透试验和固结试验测量渗透系数结果的影响。分析结果表明,试样边壁和内部缺陷均对渗透试验的结果有显著影响,而对固结试验的结果则影响较小。在选择渗透系数的测量方法时,应根据具体情况。在分析心墙坝的渗漏量时,宜通过渗透试验测定心墙料渗透系数,但需要对试样边壁进行处理,尽可能消除边壁效应的影响;在分析心墙的应力变形时,则宜通过固结试验测定心墙料的固结系数或渗透系数,以免高估了心墙的固结性能。
[Abstract]:The permeability coefficient of soil is an important index to evaluate soil permeability and consolidation performance. In the core dam, it is very important to determine the permeability coefficient of the core wall accurately to evaluate the consolidation deformation and arch effect of the core wall. The methods for measuring permeability include penetration test and consolidation test. Due to the influence of the side wall and internal defects of the specimen, the measured results of these two methods may deviate from the actual soil permeability coefficient to some extent. Based on the theoretical analysis and derivation of the conceptual model, the influence of the defects of the edge wall and the interior of the specimen on the results of the permeability test and the consolidation test is studied in this paper. The results show that both the side wall and the internal defect of the specimen have a significant effect on the results of the permeation test, while the effect on the results of the consolidation test is relatively small. When choosing the measurement method of permeability coefficient, it should be according to the concrete situation. When analyzing the leakage of core wall dam, it is advisable to measure the permeability coefficient of core wall material through permeation test, but it is necessary to treat the side wall of the sample to eliminate the influence of side wall effect as far as possible, and when analyzing the stress and deformation of core wall, In order to avoid overestimating the consolidation performance of the core wall, it is advisable to determine the coefficient of consolidation or permeability of the core wall by consolidation test.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;中国电建集团成都勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51379221) 国家重点研发计划项目(2016YFC0401603) 中国水利水电科学研究院基本科研业务费专项项目(GE0145B312017)
【分类号】：TV223.4

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