土工基础

土工基础 ›› 2019, Vol. 33 ›› Issue (6): 697-700.

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珊瑚砂地基的静止侧压力系数研究

静止侧压力系数K0是表征土体内水平向应力与垂向应力间关系的一个重要参数，对岩土工程实施的各个环节都具有非常重要的意义。珊瑚砂是一种独特的岩土材料类型，颗粒强度低且棱角发育，具有不同于石英砂的岩土工程特性。采用水囊式高压固结仪开展不同相对密度及含水量珊瑚砂的静止侧压力系数试验研究。结果表明：①珊瑚砂的静止侧压力系数介于0.2-0.29之间，相比石英砂的要小；②珊瑚砂的静止侧压力系数随含水量的增加而增大，但增量较小；③密实度对珊瑚中砂的静止侧压力系数的影响较小。   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004；2.中国科学院武汉岩土力学研究所，武汉 430071）
  • 收稿日期:2019-03-19 修回日期:2019-04-10 出版日期:2019-12-28 发布日期:2019-12-28
  • 通讯作者: 朱长歧（1963-），男，研究员，博士生导师，研究方向为珊瑚岛礁的工程地质、水文地质以及生物碳酸盐类岩土的工程特性等。
  • 作者简介:张珀瑜（1991-），男，硕士研究生。研究方向为珊瑚岛礁工程地质等。
  • 基金资助:
    国家自然科学基金项目(No.41877271，No.41372318，No.41330642)；中国科学院战略性先导科技专项（A类）(No.XDA13010300)。

Testing of AtRest Lateral Earth Pressure Coefficient of Coral Sands

The at-rest lateral earth pressure coefficient is an important soil parameter that indicating the relationship between the vertical and lateral stresses in the soil mass and poses an important role throughout every aspect of geotechnical engineering. The coral sand is a unique geotechnical material with a relatively low individual grain strength and welldeveloped angularity, therefore, the engineering properties of the coral sands are significantly different from those of quartz sand of land origins. This paper presents the laboratory at-rest lateral earth coefficient test results of coral sand samples under various relative density and moisture contents throughout the Anteus high-pressure consolidation test devices. The results indicated that: 1) the tested at-rest lateral earth pressure coefficients are between 0.20 and 0.29 and these values are smaller than those of from quartz sand samples. 2) The at-rest lateral earth pressure coefficient of coral sand samples increases with the moisture content, but the increment is not significant. 3) The effect of density of samples on the magnitude of lateral earth pressure is not significant.   

  1. (1.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    2.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2019-03-19 Revised:2019-04-10 Online:2019-12-28 Published:2019-12-28

摘要： 静止侧压力系数K0是表征土体内水平向应力与垂向应力间关系的一个重要参数，对岩土工程实施的各个环节都具有非常重要的意义。珊瑚砂是一种独特的岩土材料类型，颗粒强度低且棱角发育，具有不同于石英砂的岩土工程特性。采用水囊式高压固结仪开展不同相对密度及含水量珊瑚砂的静止侧压力系数试验研究。结果表明：①珊瑚砂的静止侧压力系数介于0.2-0.29之间，相比石英砂的要小；②珊瑚砂的静止侧压力系数随含水量的增加而增大，但增量较小；③密实度对珊瑚中砂的静止侧压力系数的影响较小。

关键词: 珊瑚中砂, 静止侧压力系数, 水囊式高压固结仪, 相对密实度, 含水率

Abstract: The at-rest lateral earth pressure coefficient is an important soil parameter that indicating the relationship between the vertical and lateral stresses in the soil mass and poses an important role throughout every aspect of geotechnical engineering. The coral sand is a unique geotechnical material with a relatively low individual grain strength and welldeveloped angularity, therefore, the engineering properties of the coral sands are significantly different from those of quartz sand of land origins. This paper presents the laboratory at-rest lateral earth coefficient test results of coral sand samples under various relative density and moisture contents throughout the Anteus high-pressure consolidation test devices. The results indicated that: 1) the tested at-rest lateral earth pressure coefficients are between 0.20 and 0.29 and these values are smaller than those of from quartz sand samples. 2) The at-rest lateral earth pressure coefficient of coral sand samples increases with the moisture content, but the increment is not significant. 3) The effect of density of samples on the magnitude of lateral earth pressure is not significant.

Key words: Medium Coral Sands, At-Rest Lateral Earth Pressure Coefficient, Anteus High Pressure Consolidometer, Relative Density, Moisture Content

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