水泥砂浆固化粉质黏土分离式Hopkinson压杆试验与分析

高常辉; 马芹永

doi:10.13801/j.cnki.fhclxb.20170727.005

水泥砂浆固化粉质黏土分离式Hopkinson压杆试验与分析

高常辉¹,
马芹永^2,

1.
安徽理工大学土木建筑学院, 淮南 232001;
2.
安徽理工大学矿山地下工程教育部工程研究中心, 淮南 232001

基金项目: 安徽理工大学研究生创新基金（2017CX2020）

详细信息

通讯作者:
马芹永,博士,教授,博士生导师,研究方向为岩土工程,E-mail:qymaah@126.com

中图分类号: TU447
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出版历程
- 收稿日期: 2017-05-22
- 修回日期: 2017-07-06
- 刊出日期: 2018-06-14

Analysis of silty clay stabilized by cement mortar based on split Hopkinson pressure bar experiment

GAO Changhui¹,
MA Qinyong^2,

1.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2.
Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China

摘要

摘要: 为研究掺砂量（与干土的质量比）对水泥粉质黏土冲击压缩强度及能量吸收特征的影响，采用Φ 50 mm分离式Hopkinson压杆（Split Hopkinson pressure bar，SHPB）试验装置对不同掺砂量的水泥粉质黏土进行了0.4 MPa冲击气压下的冲击压缩试验。结果表明：普通水泥粉质黏土（未掺砂）动态应力-应变曲线大致分为弹性阶段、屈服硬化阶段及破坏阶段，而随着掺砂量的逐渐增加，水泥砂浆固化粉质黏土动态应力-应变曲线中屈服阶段愈加不明显，出现了理想的塑性阶段；水泥砂浆固化粉质黏土的冲击压缩强度随掺砂量的增大而先增大后减小，在掺砂量为10%时达到最大平均动强度9.56 MPa，较普通水泥土强度提高9.79%；水泥砂浆固化粉质黏土的吸收能随冲击压缩强度的增大而增大，两者具有较好的指数关系。
- 水泥砂浆固化粉质黏土 /
- 冲击压缩强度 /
- 能量吸收 /
- 掺砂量 /
- SHPB
Abstract: To study the effects of sand content on dynamic compression strength and energy absorption characteristics of cemented silty clay, dynamic compression tests on cemented silty clay with different sand contents were conducted using Φ 50 mm split Hopkinson pressure bar (SHPB) apparatus under 0.4 MPa impact pressure. The results show that the dynamic stress-strain curve of plain cemented silty clay (without sand) can be divided into three stages of elastic deformation, yield-hardening and failure. With the increase of sand content, there is an ideal plastic stage occurring on dynamic stress-strain curve but not obvious for yield stage gradually. In addition, the dynamic compression strength of silty clay stabilized by cement mortar increases firstly and then decreases with the increasing of sand content. The maximum of dynamic compression strength of silty clay stabilized by cement mortar is 9.56 MPa at sand content of 10%, which results in 9.79% increase compared with plain cement-soil. The absorbed energy of silty clay stabilized by cement mortar increases with the increase of dynamic compression strength, which shows an approximate exponential relation.
- silty clay stabilized by cement mortar /
- dynamic compression strength /
- energy absorption /
- sand content /
- SHPB

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