灰岩单轴抗压特性的浸水效应研究
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国家自然科学基金资助项目(51074166)


Research on immersion effect of uniaxial compressive strength of limestone
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    摘要:

    为了考察软岩浸水后软化行为对单轴抗压特性的影响,取河南陈四楼煤矿二1煤底板太原组灰岩为试验材料,在三种不同的加载速率下,对不同浸水时间下试样进行单轴压缩试验,得到关于灰岩抗压特性的浸水效应。试验结果表明:在一定的加载速率下,随浸水时间增加,抗压强度和弹性模量逐渐减小,且降低幅度越来越小;随浸水时间增加,试样逐渐由弹性变形转变为塑性变形,但极限应变基本不变;试样内部不可逆的损伤破坏加剧,总应变能和弹性能与浸水时间呈指数关系,耗散能随浸水时间的变化可以用线性关系拟合。

    Abstract:

    In order to investigate the effect of soft rock softening behavior on uniaxial compressive properties,the limestone of Taiyuan formation of No. 1 coal floor in Chensilou Coal Mine,Henan Province is selected as experimental materials. Under three different loading rates,uniaxial compression tests were carried out on the samples under different soaking times,and the soaking effects on the compressive properties of limestone were obtained. The results of the study are as follows:at a certain loading rate,the compressive strength and elastic modulus decrease gradually with the increase of soaking time,and the decreasing extent e is smaller and smaller. With the increase of soaking time,the specimen changes gradually from elastic deformation to plastic deformation,but the limit strain is basically unchanged. The total strain energy and elastic energy are exponentially reduced,and the variation of dissipation energy with immersion time can be fitted by linear relation.

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曾朝辰,白海波,何世鑫.灰岩单轴抗压特性的浸水效应研究[J].河北工程大学自然版,2018,35(3):82-85,105

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  • 收稿日期:2018-05-04
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  • 在线发布日期: 2018-10-13
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