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CLC number: TU45

On-line Access: 2015-09-03

Received: 2014-12-20

Revision Accepted: 2015-07-27

Crosschecked: 2015-08-07

Cited: 6

Clicked: 1759

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jin Yu

http://orcid.org/0000-0003-0088-7652

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.9 P.749-759

http://doi.org/10.1631/jzus.A1400362


Experimental investigation on mechanical properties and permeability evolution of red sandstone after heat treatments


Author(s):  Jin Yu, Shao-jie Chen, Xu Chen, Ya-zhou Zhang, Yan-yan Cai

Affiliation(s):  1Institute of Geotechnical Engineering, Huaqiao University, Xiamen 361021, China; more

Corresponding email(s):   bugyu0717@hqu.edu.cn

Key Words:  Heat treatment, Red sandstone, Triaxial compression test, Mechanical property, Permeability


Jin Yu, Shao-jie Chen, Xu Chen, Ya-zhou Zhang, Yan-yan Cai. Experimental investigation on mechanical properties and permeability evolution of red sandstone after heat treatments[J]. Journal of Zhejiang University Science A, 2015, 16(9): 749-759.

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DOI - 10.1631/jzus.A1400362


Abstract: 
triaxial compression tests were carried out on red sandstone samples which had been previously subjected to heat treatments at 20, 200, 400, and 600 °C to study the change in properties and mechanical characteristics of the rock and the permeability (gas) evolution. Results show that: (1) the color of the sandstone changes from gray to brownish red with incremental change of temperature; (2) the strength of the rock increases with heat treatments from 20 to 200 °C and decreases with heat treatments from 200 to 600 °C, while the permeability of the rock after the heat treatments changes in the opposite trend; (3) from 20 to 200 °C, the primary pores and cracks close gradually, which results in the strength and elastic modulus increasing and permeability of the rock after the heat treatment decreasing; from 200 to 600 °C, the degradation of the sandstone causes the fall in strength and elastic modulus, and the rise in strain corresponding to the peak stress and permeability of the rock after the heat treatment; (4) the permeability in a stress-strain process varies with the evolution of cracks; (5) when the heating temperature is beyond 800 °C, the sandstone is seriously thermally damaged.

Research on mechanical properties and permeability evolution of sandstone after heat treatment is important to some rock engineering applications such as sandstone reservoir, oil and gas enhanced recovery, underground coal gasification. This paper described experimental results of triaxial compression testing with gas permeability measurement on red sandstones after thermal treatment of 200, 400 and 600°C. The results are very interesting.

热处理后红砂岩力学性能及渗透性演化规律三轴试验研究

目的:研究高温热开裂后红砂岩的物理力学性能和渗透性的量化变化规律。
创新点:1. 相比于传统液体稳态流渗透率测试法耗时多的缺点,本文通过氮气渗透方式,可快速获得低渗透率岩样的稳态流渗透率;2. 从裂隙体积变化角度,分析不同温度热开裂红砂岩在三轴压缩条件下的各裂隙发展阶段,讨论其与渗透性演化的 关系。
方法:1. 通过纵波波速测试和带渗透性实时监测的三轴压缩试验等手段,获得热处理后红纱岩基本物理力学性质参数(表1和表2)、不同围压下的全应力-应变关系曲线、轴向应变-体变关系曲线以及渗透率变化曲线(图4和图8);2. 通过理论分析和计算,获得轴向应变与裂隙体变的关系曲线(图9),分析裂隙演化5个阶段中渗透率的演化规律。
结论:1. 由20到200 °C,红砂岩原生孔隙和裂隙发生闭合,增加了试样密实度,并引起强度和弹模的提高以及初始渗透率的降低;从200到600 °C,红砂岩内部结构逐渐劣化,导致强度和弹模降低,峰值应变和初始渗透率提高;2. 加载过程中试样渗透率随裂隙的演化而变化,裂隙演化可分为压密、线弹性变形、裂隙稳定发展、宏观剪切破坏和应变软化5个阶段。这5个阶段中渗透率变化趋势不同;3. 当受热温度继续增大至800 °C时,红砂岩出现严重的裂纹致使其破坏。

关键词:热处理;红砂岩;三轴压缩试验;力学性能;渗透性

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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