| 钙质砂剪切特性的围压效应和粒径效应研究 |
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| 引用本文： | 闫超萍,龙志林,周益春,旷杜敏,陈佳敏.钙质砂剪切特性的围压效应和粒径效应研究[J].岩土力学,2020,41(2):581-591. |
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| 作者姓名： | 闫超萍 龙志林 周益春 旷杜敏 陈佳敏 |
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| 作者单位： | 1. 湘潭大学 土木工程与力学学院，湖南 湘潭 411105；2. 湘潭大学 材料科学与工程学院，湖南 湘潭 411105 |
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| 基金项目： | 国家自然科学基金（No. 51471139） |
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| 摘 要： | 为研究钙质砂剪切特性的围压效应和粒径效应，开展了在不同粒径、不同相对密实度以及不同围压条件下的三轴剪切试验，并引入应力相对软化系数和剪胀系数对应变软化特征及剪胀特征进行了定量表征。试验研究表明，随围压的增大，不同粒径钙质砂试样应变软化特征及剪胀特征逐渐减弱，且围压与应力相对软化系数和剪胀系数均呈半对数线性相关。不同粒径钙质砂试样存在一强度临界围压和体变临界围压分别使得应变软化特征和剪胀特征消失。在粒径为5～0.075 mm范围内，对松样而言，围压对软化特征和剪胀特征存在显著影响，但与粒径不存在显著相关性；对密样而言，随粒径逐渐减小，围压对试样软化特征的影响逐渐增强，而对试样剪胀特征的影响逐渐减弱。在低围压（50 kPa）条件下，0.5～0.25 mm粒径组试样破碎最显著。
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| 关 键 词： | 钙质砂 粒径效应 三轴剪切试验 |
| 收稿时间： | 2019-02-13 |
| 修稿时间： | 2019-04-29 |
Investigation on the effects of confining pressure and particle size
of shear characteristics of calcareous sand |
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| YAN Chao-ping,LONG Zhi-lin,ZHOU Yi-chun,KUANG Du-min,CHEN Jia-min.Investigation on the effects of confining pressure and particle size
of shear characteristics of calcareous sand[J].Rock and Soil Mechanics,2020,41(2):581-591. |
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| Authors: | YAN Chao-ping LONG Zhi-lin ZHOU Yi-chun KUANG Du-min CHEN Jia-min |
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| Institution: | 1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan 411105, China;
2. College of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China |
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| Abstract: | In order to study the confining pressure effect and particle size effect of shear properties of calcareous sand, triaxial shear tests were carried out under different particle sizes, relative densities and confining pressures. The stress relative softening coefficient and dilatancy coefficient were introduced to quantitatively characterize the strain softening and dilatancy characteristics. The experimental results show that with the increase of confining pressure, the strain softening and dilatancy characteristics of calcareous sand samples with different particle sizes decrease gradually, and the confining pressure is semi-logarithmic linear with the relative stress softening coefficient and dilatancy coefficient. The strain softening and dilatancy characteristics of calcareous sand samples with different particle sizes disappear due to the existence of critical confining pressure of strength and critical confining pressure of volume variation. In the range of particle size 5-0.075 mm, confining pressure has a significant effect on softening and dilatancy characteristics of loose samples, but there is no significant correlation with particle size. For dense samples, the effect of confining pressure on softening characteristics of samples increases with decreasing particle size, while the effect on dilatancy characteristics of samples decreases. Under a low confining pressure (50 kPa), the breakage of 0.5-0.25 mm particle size group is the most significant. |
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| Keywords: | calcareous sand particle size effect triaxial shear test |
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