不同高温作用后石灰岩物理与动力特性试验研究

doi:10.16285/j.rsm.2020.1170

岩土力学 ›› 2021, Vol. 42 ›› Issue (4): 932-942.doi: 10.16285/j.rsm.2020.1170

不同高温作用后石灰岩物理与动力特性试验研究

平琦^{1, 2, 3}，苏海鹏^{2, 3}，马冬冬^{2, 3}，张号^{2, 3}，张传亮^{2, 3}

1. 安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室，安徽淮南 232001； 2. 安徽理工大学矿山地下工程教育部工程研究中心，安徽淮南 232001；3. 安徽理工大学土木建筑学院，安徽淮南 232001

收稿日期:2020-08-06 修回日期:2020-10-06 出版日期:2021-04-12 发布日期:2021-04-25
作者简介:平琦，男，1975年生，博士（后），教授，硕士生导师，主要从事岩石动力学和爆破理论与技术方面的教学与研究工作。
基金资助:
国家自然科学基金（No. 52074005，No. 52074006，No. 51674008）；安徽省自然科学基金（No. 1808085ME134）；安徽省博士后基金（No. 2015B058）。

Experimental study on physical and dynamic mechanical properties of limestone after different high temperature treatments

PING Qi^{1, 2, 3}, SU Hai-peng^{2, 3}, MA Dong-dong^{2, 3}, ZHANG Hao^{2, 3}, ZHANG Chuan-liang^{2, 3}

1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 2. Engineering Research Center of Underground Mine Construction of Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 3. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232001, China

Received:2020-08-06 Revised:2020-10-06 Online:2021-04-12 Published:2021-04-25
Supported by:
This work was supported by the National Natural Science Foundation of China (52074005, 52074006, 51674008), the Anhui Natural Science Foundation (1808085ME134) and the Anhui Postdoctoral Science Foundation (2015B058).

摘要/Abstract

摘要： 为研究石灰岩物理和动力学性质受高温作用影响的规律，对常温和经历100～800 ℃高温作用后石灰岩试件进行物理参数测试，利用SHPB试验装置开展相同加载条件冲击压缩试验。研究结果表明：石灰岩主要矿物成分为方解石和白云石，常温石灰岩结构致密，随作用温度升高，白云石逐渐分解形成微米级颗粒，试件颜色由灰白色逐渐变浅至白色，体积增大，质量、密度和纵波波速减小，且变化速率与作用温度密切相关。不同高温作用后动压缩应力–应变曲线变化规律基本一致；动抗压强度和动弹性模量随作用温度升高表现为先小幅增加后大幅降低，与作用温度呈负相关二次函数关系，200 ℃时最大；动应变和应变率与作用温度呈正相关二次函数关系；破坏形态表现为由脆性向延脆性破坏转化，200 ℃时破坏程度最小，随作用温度升高破坏程度加剧、碎块粒径逐渐变小，800 ℃时碎块基本呈现为粉末状。

关键词: 岩石动力学, 高温作用, 动抗压强度, 动应变, 动弹性模量, 分离式Hopkinson压杆(SHPB)

Abstract: To investigate the effect of high temperature on physical and dynamic mechanical properties of limestone, basic physical tests were conducted on limestone specimens at room temperature and high temperature treatment from 100 ℃ to 800 ℃. Moreover, dynamic impact compression tests under the same loading conditions were also conducted using SHPB test device. Test results indicate that the main mineral composition of limestone is calcite and dolomite. At room temperature, the limestone has a compact structure. With the increase of treating temperature, the dolomite gradually decomposes into micro-sized particles, and the surface color of test specimens gradually changes from off-white to white. Moreover, the volume of test specimens increases, while its mass, density and P-wave velocity decrease. These variation rates are closely related to the temperature. Dynamic compression stress-strain curves of limestone specimens under different high temperatures are basically consistent. A small increase followed by a significant decrease can be observed for both the dynamic compressive strength and dynamic elastic modulus with the increase of the temperature. An obvious negative quadratic function relationship is also found between these dynamic parameters and the treating temperature, and the maximum value is observed at 200 ℃. However, parameters including the dynamic strain and strain rate of test specimens, and the treating temperature are in a positive quadratic function relationship. The failure modes of specimens transit from brittle to ductile brittle, and damage degree is the lowest at 200 ℃. The damage degree increases with the increase of temperature, and the size of limestone fragments gradually decreases, which basically becomes powder at 800 ℃.

Key words: rock dynamics, high temperature treatment, dynamic compressive strength, dynamic strain, dynamic elastic modulus, split Hopkinson pressure bar (SHPB)

中图分类号:

TU 451

平琦, 苏海鹏, 马冬冬, 张号, 张传亮, . 不同高温作用后石灰岩物理与动力特性试验研究[J]. 岩土力学, 2021, 42(4): 932-942.

PING Qi, SU Hai-peng, MA Dong-dong, ZHANG Hao, ZHANG Chuan-liang, . Experimental study on physical and dynamic mechanical properties of limestone after different high temperature treatments[J]. Rock and Soil Mechanics, 2021, 42(4): 932-942.

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不同高温作用后石灰岩物理与动力特性试验研究

Experimental study on physical and dynamic mechanical properties of limestone after different high temperature treatments

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