Effects of strain rates on mechanical properties of limestone under high temperature  

作　　者：Tang Furong Mao Xianbiao Zhang Lianying Yin Huiguang Li Yan 

机构地区：[1]State Key Laboratory of Geomechanics ＆ Deep Underground Engineering, China University of Mining ＆ Technology, Xuzhou 221008, China [2]School of Sciences, China University of Mining ＆ Technology, Xuzhou 221116, China [3]Civil Engineering Department, Xuzhou Institute of Technology, Xuzhou 221008, China

出　　处：《Mining Science and Technology》2011年第6期857-861,共5页矿业科学技术（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities (No. 2011QNB05);the National Basic Research Program of China (No. 2007CB209400);the National Natural Science Foundation of China (Nos. 51074166 and 51104128);the Research Project for Ministry of Housing and Urban-Rural Development of China (No. 2011-K3-5);the Innovation Project of Graduate Students in Jiangsu Province (No. CX09B_108Z)

摘　　要：The experimental tests for limestone specimens at 700 °C in uniaxial compression were carried out to inves- tigate the mechanical effects of loading rates on limestone by using a MTS810 rock mechanics servo- controlled testing system considering the loading rate as a variable. The mechanical properties of limestone such as the stress-strain curve, variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the strain rates ranging from 1.1 10à5 to 1.1 10à1 sà1. (1) Sharp decreases were shown for the peak strength and elastic modulus of limestone from 1.1 10à5 to 1.1 10à4 sà1 at 700 °C as well as a downward trend was shown from 1.1 10à4 to 1.1 10à1 sà1 with the rise of the strain rate. (2) The peak strain increased from 1.1 10à5 to 1.1 10à4 sà1, however, there was no obvious changes shown for the peak strain of limestone from 1.1 10à4 to 1.1 10à1 sà1. These results can provide valuable references for the rock blasting effect and design of mine.The experimental tests for limestone specimens at 700 °C in uniaxial compression were carried out to inves- tigate the mechanical effects of loading rates on limestone by using a MTS810 rock mechanics servo- controlled testing system considering the loading rate as a variable. The mechanical properties of limestone such as the stress–strain curve, variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the strain rates ranging from 1.1 10à5 to 1.1 10à1 sà1. （1） Sharp decreases were shown for the peak strength and elastic modulus of limestone from 1.1 10à5 to 1.1 10à4 sà1 at 700 °C as well as a downward trend was shown from 1.1 10à4 to 1.1 10à1 sà1 with the rise of the strain rate. （2） The peak strain increased from 1.1 10à5 to 1.1 10à4 sà1, however, there was no obvious changes shown for the peak strain of limestone from 1.1 10à4 to 1.1 10à1 sà1. These results can provide valuable references for the rock blasting effect and design of mine.

关 键 词：Strain rates High temperature Mechanical properties Limestone 

分 类 号：TU452[建筑科学—岩土工程] P588.245[建筑科学—土工工程]