院报 ›› 2018, Vol. 35 ›› Issue (11): 154-158.DOI: 10.11988/ckyyb.20180924

• 第28届全国土工测试学术研讨会专栏 • 上一篇    

K0应力条件下砂土小应变剪切模量研究

李友洪1a,1b, 顾晓强1a,1b,2, 梁发云1a,1b   

  1. 1.同济大学 a.地下建筑与工程系;b.岩土与地下工程教育部重点实验室,上海 200092;
    2.中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221008
  • 收稿日期:2018-04-10 修回日期:2018-09-21 出版日期:2018-11-01 发布日期:2018-11-16
  • 通讯作者: 顾晓强(1981- ),男,浙江桐乡人,副研究员,博士,主要从事土动力学和宏微观土力学等方面的研究。E-mail:guxiaoqiang@tongji.edu.cn
  • 作者简介:李友洪(1994- ),男,四川成都人,硕士研究生,从事土体基本特性研究。E?mail: youhongli@tongji.edu.cn
  • 基金资助:
    国家重点研发计划项目(2016YFC0800200); 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1712)

Shear Modulus of Sand at Small Strain under K0 Stress State

LI You-hong1, 2, GU Xiao-qiang1, 2, 3, LIANG Fa-yun1, 2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
    2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Shanghai 200092, China;
    3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China
  • Received:2018-04-10 Revised:2018-09-21 Online:2018-11-01 Published:2018-11-16

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摘要： 利用带弯曲元波速测试的三轴仪对不同密实度下饱和丰浦砂进行了侧向静止土压力系数K0固结试验,旨在得出丰浦砂在不同密实度下K0值,并通过弯曲元波速测试计算K0固结条件下饱和砂的小应变剪切模量。研究表明:随着砂土密实度的增加,K0变小。同时,确定了K0固结下砂土的小应变剪切模量G0随有效围压和密实度的变化,并确定了G0预测公式中的参数A和n的值。基于试验成果,进一步尝试建立了丰浦砂K0系数和其小应变剪切模量G0的关系。

关键词: 砂土, 三轴试验, 密实度, 侧向静止土压力系数K0, 弯曲元, 小应变剪切模量

Abstract: One-dimensional consolidation tests were carried out in a stress path triaxial to investigate the coefficient of lateral earth pressure K0 of saturated Toyoura sand with different densities. Bender elements for shear wave measurement were installed in the triaxial device. The shear wave velocity of sand specimens can be measured under the K0 stress state and then the small strain shear stiffness G0 of Toyoura sand can be calculated. Results demonstrated that the value of K0 decreases as the density of sand increases. Furthermore, the effects of effective mean confining pressure and density on shear modulus G0 at small strain were also investigated. Parameters A and n in the empirical equation for predicting the G0 of sand sample during the K0 stress rate were determined. Moreover, the relationship between K0 and G0 was analyzed and it was found that K0 decreases almost linearly as G0 increases.

Key words: sand, triaxial test, density, lateral static earth pressure K0, bender element, shear modulus at small strain

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