钙质粉粒含量对钙质砂三轴固结不排水剪切特性的影响研究

农珍珍; 丁宇; 姜朋明; 徐天宇; 李亮; 王丽艳

doi:10.3724/j.gyjzG24051601

钙质粉粒含量对钙质砂三轴固结不排水剪切特性的影响研究

doi: 10.3724/j.gyjzG24051601

1. 江苏科技大学船舶与海洋工程学院, 江苏镇江 212100;
2. 江苏科技大学土木工程与建筑学院, 江苏镇江 212100;
3. 苏州科技大学建筑与土木工程学院, 江苏苏州 215000

基金项目:

国家自然科学基金项目（51979128）。

详细信息

作者简介:
农珍珍，博士，助理研究员，主要从事岩土及海洋岩土的动力特性相关试验及模拟研究。Email:zznong@foxmail.com

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出版历程
- 收稿日期: 2024-05-16
- 刊出日期: 2025-10-31

Effects of Calcareous Fine Content on the Shear Characteristics of Calcareous Sand by Consolidated Undrained Triaxial Tests

1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
2. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
3. School of Architecture and Civil Engineering, Suzhou University of Science and Technology, Suzhou 215000, China

摘要

摘要: 钙质砂丰富的内孔隙结构使得在吹填时期水力运移及建设后期场地整平的作用下，地基中的粉粒与砂粒容易相互混合，粉粒的掺入会使钙质砂的颗粒组构发生变化，进而影响钙质砂的力学性能。为分析钙质粉粒含量对钙质砂静力特性的影响，针对钙质粉粒含量为0%、10%、40%、70%和100%的钙质粉-砂混合料开展了多组围压条件下的固结不排水剪切试验，探究钙质粉-砂混合料的抗剪强度和孔压变化规律，分析钙质粉粒含量对钙质砂颗粒破碎的影响。试验结果表明：随着粉粒含量的增加，钙质粉-砂混合料偏应力峰值先减小后增大，孔压峰值先增大后减小，峰值内摩擦角先增大后减小，在本试验中上述变化的转折点均发生在粉粒含量为10%的混合料试样，通过脆性指数分析表明粉粒含量为10%时试样的稳定性最差；随着围压的增大，钙质粉-砂混合料的峰值内摩擦角减小，相对破碎指数增大；钙质砂的相对破碎指数与围压和粉粒含量均呈现出良好的线性关系。基于本研究结果，钙质砂颗粒相对破碎指数可通过围压和粉粒含量双因子变量的多项式进行表达。
- 钙质粉粒含量 /
- 钙质砂 /
- 不排水剪切特性 /
- 内摩擦角 /
- 颗粒破碎
Abstract: The rich internal pore structure of calcareous sand allows fine particles and sand particles in the foundation to mix easily with each other during hydraulic transport during hydraulic filling and site leveling in later construction. The addition of fine particles can change the particle composition of calcareous sand， thereby affecting its mechanical properties. To analyze the influence of calcareous fine content on the static characteristics of calcareous sand， multiple sets of consolidated undrained triaxial tests were conducted under varied confining pressures on calcareous fine-sand mixtures with fine contents of 0%， 10%， 40%， 70%， and 100%. Changes in shear strength and pore pressure were investigated， and the impact of calcareous fine content on the breakage of calcareous sand particles was analyzed. The experimental results showed that as the fine content increased， the peak stresses of the calcareous fine-sand mixtures first decreased and then increased， while the peak pore pressures and peak internal friction angles first increased and then decreased. In this experiment， the turning points of these changes all occurred in the mixture samples with a fine content of 10%. As the confining pressure increased， the peak internal friction angles of the calcareous fine-sand mixtures decreased， and the relative breakage index increased. In addition， the relative particle breakage index of calcareous sand showed a strong linear relationship with both confining pressure and fine content. Based on the results of this study， the relative particle breakage index of calcareous sand can be expressed by a polynomial function of confining stress and fine content.
- calcareous fine content /
- calcareous sand /
- undrained shear characteristics /
- internal friction angle /
- particle breakage

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参考文献(18)

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