岩土力学 ›› 2020, Vol. 41 ›› Issue (1): 214-220.doi: 10.16285/j.rsm.2018.2358

• 基础理论与实验研究 • 上一篇    下一篇

基于级配方程的粗粒料压实特性试验研究

吴二鲁1, 2，朱俊高1, 2，郭万里3，陆阳洋3   

  1. 1. 河海大学 岩土力学与堤坝工程教育部重点实验室，江苏 南京 210098；2. 河海大学 江苏省岩土工程技术工程研究中心，江苏 南京 210098；3. 南京水利科学研究院 岩土工程研究所，江苏 南京 210024
  • 收稿日期:2018-12-29 修回日期:2019-04-29 出版日期:2020-01-13 发布日期:2020-01-05
  • 通讯作者: 朱俊高，男，1964年生，博士，教授，博士生导师，主要从事土体基本性质及本构关系、土石坝工程研究。E-mail: zhujungao@hhu.edu.cn E-mail: 170804010004@hhu.edu.cn
  • 作者简介:吴二鲁，男，1993年生，博士，主要从事土体基本性质、土石坝工程等方面的研究工作。
  • 基金资助:
    国家重点研发计划项目（No.2017YFC0404804）；江苏省研究生科研与实践创新计划项目（No.KYCX18_0566）；中央高校基本科研业务费（学生项目）（No.2018B668X14）；国家自然科学基金（No.U1865104，No.51479052）

Experimental study of compaction characteristics of coarse-grained soil based on gradation equation

WU Er-lu1, 2, ZHU Jun-gao1, 2, GUO Wan-li3, LU Yang-yang3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu, 210098, China; 3. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu, 210024, China
  • Received:2018-12-29 Revised:2019-04-29 Online:2020-01-13 Published:2020-01-05
  • Supported by:
    This work was supported by the National Key R & D Program of China (2017YFC0404804), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0566) , the Fundamental Research Funds for the Central Universities (Student Programs) (2018B668X14) and the National Natural Science Foundation of China (U1865104, 51479052).

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摘要： 级配显著影响着堆石料的压实特性，定量表述级配对堆石料压实特性的影响至关重要。基于连续级配土的级配方程，设计了16组不同级配的试验粗粒料，进行了表面振动压实试验和侧限压缩试验，定量研究了级配对粗粒料压实特性的影响。研究表明：由表面振动压实（动应力）试验和侧限压缩（静应力）试验得到的干密度与级配曲线面积之间均呈二次函数关系，且干密度中的最大值对应的级配曲线面积均在0.9附近；无论是表面振动压实试验还是侧限压缩试验，堆石料都存在干密度最优（最大）的级配。依据试验成果，给出了所试验堆石料的最优级配区间（级配上、下包络线）；同时，利用相似级配法论证了实际级配粗粒料的最优级配区间，并根据国内外多座土石坝粗粒料的设计级配验证了该最优级配区间的普遍适用性，为土石坝粗粒料的级配设计提供了理论依据。

关键词: 粗粒料, 压实性, 级配方程, 干密度, 级配曲线

Abstract: Since gradation greatly affects its compaction characteristics, the quantitative description of the effect of gradation on compaction properties is crucial. Based on the continuous gradation equations of soil, 16 groups of experimental coarse-grained soils with different gradations were designed. Surface vibration compaction test and confined compression test were carried out to study the effect of gradation on compaction properties of coarse-grained soil. The results showed that the quadratic function relationship was found between the gradation curve area and dry density obtained by surface vibration compaction (dynamic stress) and confined compression (static stress). Besides, the gradation curve areas corresponding to the maximum values of dry density were close to 0.9. Both in surface vibration compaction test or confined compression test, there was optimal dry density of coarse-grained soil under certain gradation. Based on test results, the optimal gradation interval of coarse-grained soil with better compaction was given (upper and lower envelopes of gradation), which was further demonstrated through similar grading method. Meanwhile, the universal applicability of this optimal gradation interval was verified by the design gradation of coarse-grained soil of several earth-rock dams. This paper can provide the important basis for the grading design of coarse-grained soil for earth-rock dam.

Key words: coarse-grained soil, compatibility, gradation equation, dry density, gradation curve

中图分类号: 

  • TU411
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