Show simple item record

contributor authorShuai Liu
contributor authorGengshe Yang
contributor authorXihao Dong
contributor authorYanjun Shen
contributor authorHui Liu
date accessioned2022-05-07T20:58:20Z
date available2022-05-07T20:58:20Z
date issued2022-3-1
identifier other(ASCE)CR.1943-5495.0000272.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4283138
description abstractTo study the energy characteristics and damage laws of frozen rock during mine freezing, a triaxial compression test and synchronous acoustic emission test of frozen sandstone are conducted. The results show that (1) the peak stress of frozen sandstone is more than as thrice as that of sandstone at 20°C. According to the elastic energy conversion rate, two stress thresholds are determined, and the peak stress is combined to divide the frozen sandstone damage section. When the stress is in the range of 0–σeb, the increase rates of the dissipation energy (Ud) and acoustic emission cumulative energy (AECE) of the frozen sandstone are significantly less than those of the sandstone at 20°C. The total input energy (U), elastic energy (Ue), and Ud at the peak stress of frozen sandstone are more than as twice as those of sandstone at 20°C. As the negative temperature of the sandstone decreases, U, Ue, and the elastic energy conversion rate at the peak stress slightly increase. (2) The AECE of the 20°C sandstone at the peak stress is approximately 1/2 the AECEmax. The AECE of the frozen sandstone at the peak stress accounts for approximately 1/5 the AECEmax. As the negative temperature decreases, the AECEmax of the sandstone increases. (3) As the confining pressure of frozen sandstone increases, U, Ue, and Ud at the peak stress increase, the elastic energy conversion rate decreases, and AECEmax significantly increases. For frozen sandstone under different confining pressures, AECE at the peak stress accounts for 11%–25% of AECEmax, and the proportion increases with increasing confining pressure. (4) AECE is used to define the damage variables, and a constitutive model of frozen sandstone is obtained. Before the peak stress, the results of the constitutive model are in agreement with the test results. The two damage evolution curves of frozen sandstone based on Ud and AECE can describe the damage evolution process.
publisherASCE
titleEnergy Characteristics and Damage Constitutive Model of Frozen Sandstone under Triaxial Compression
typeJournal Paper
journal volume36
journal issue1
journal titleJournal of Cold Regions Engineering
identifier doi10.1061/(ASCE)CR.1943-5495.0000272
journal fristpage04021021
journal lastpage04021021-12
page12
treeJournal of Cold Regions Engineering:;2022:;Volume ( 036 ):;issue: 001
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record