Strength and the cracking behavior of frozen sandstone containing ice‐filled flaws under uniaxial compression

IF 3 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Permafrost and Periglacial Processes Pub Date : 2022-03-04 DOI:10.1002/ppp.2142

H. Jia, L. Han, T. Zhao, Q. Sun, Xian-jun Tan

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引用次数: 4

Abstract

Understanding the mechanical properties of frozen flawed rock masses is fundamental to conducting safe rock engineering in frozen rock strata. However, there has been scarce research in this area, especially on key issues such as the strength and deformability of frozen flawed rock masses and failure processes under load. In this paper, frozen flawed sandstone was subjected to uniaxial compression and the cracking process was observed. The influences of flaw inclination angle and freezing temperature on the strength and cracking behavior of frozen flawed sandstone under load were determined. The results show that: (a) the strength of frozen flawed sandstone increases with increases in flaw inclination and decreases in temperature; (b) the flaw inclination has a dramatic influence on both the crack coalescence behavior and the final failure form of frozen flawed samples under compression; and (c) the significant influence of freezing temperature on the cracking behavior of frozen flawed sandstone is caused by the interaction between flaw ice and its surrounding rock. Strengthening of flawed sandstone by freezing results because (i) pore ice provides support and cohesion at the pore scale, while (ii) at the crack scale ice can support the flaw and resist its deformation during compression, and cementation of the ice–rock interface provides normal and tangential cracking resistance.

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含冰填裂隙冻结砂岩单轴压缩强度与开裂行为

了解冻结缺陷岩体的力学性质是在冻结岩层中进行安全岩石工程的基础。然而，这方面的研究很少，尤其是关于冻结缺陷岩体的强度和变形能力以及荷载作用下的破坏过程等关键问题。本文对冻结缺陷砂岩进行了单轴压缩，观察了其破裂过程。测定了裂纹倾角和冻结温度对冻结缺陷砂岩在荷载作用下的强度和开裂行为的影响。结果表明：（a）冻结缺陷砂岩的强度随裂纹倾角的增大和温度的降低而增大；（b）裂纹倾斜度对压缩条件下冻结缺陷试样的裂纹聚结行为和最终失效形式都有显著影响；（c）冻结温度对冻结缺陷砂岩破裂行为的显著影响是由缺陷冰与其围岩之间的相互作用引起的。通过冻结对有缺陷的砂岩进行加固是因为（i）孔隙冰在孔隙尺度上提供支撑和内聚力，而（ii）在裂缝尺度上，冰可以支撑缺陷并抵抗其在压缩过程中的变形，冰-岩石界面的胶结提供了法向和切向抗裂性。

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来源期刊

Permafrost and Periglacial Processes 地学-地质学

CiteScore

9.70

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.