不同热处理温度下红层泥岩的失重–膨胀机制研究

doi:10.13722/j.cnki.jrme.2022.0371

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摘要为了研究川东上沙溪庙组红层泥岩在不同热处理温度下的质量、裂隙、孔隙、微观结构及膨胀性能的变化规律，开展不同温度热处理实验，采用场发射电子显微镜、N2吸附孔隙测定及数字化放射影像实验(DR)，对热处理岩样的微观结构差异性、细观孔隙特征及宏观裂隙发育规律进行研究，获取岩样烘干过程的质量变化与膨胀规律，以揭示热处理对泥岩膨胀机制的影响。结果表明：(1) 随着热处理温度的升高，岩样质量损失呈现快速失水–缓慢失水及缓慢失水2种模式，上沙溪庙组红层泥岩中水分完全排出需要＞130 ℃的热处理温度；(2) 高温热处理出现黏土矿物层间张开及沿层断裂的现象，而低温热处理多为层内断裂，热处理温度对热处理后宏观裂隙的贡献度低于原生裂隙；(3) 随着热处理温度的降低，孔隙内0.5～2 nm的细小颗粒明显增多，在110 ℃时该颗粒物数量达到峰值。热处理温度对微观孔隙尺寸影响明显，与天然状态的孔隙单峰分布相比，高温热处理后孔隙分布呈现双峰的规律；(4) 低温处理下呈现出宏观裂隙控制型，而高温处理下呈现出宏观裂隙‐微观孔隙控制型的膨胀模式，且提高热处理温度可显著提高快速膨胀阶段的曲线斜率及最终膨胀量。研究结果揭示了不同热处理温度处理下微观结构–孔隙特征、宏观裂隙发育规律及热处理温度对膨胀特性的影响，同时可预判已知热处理条件下，上沙溪庙组红层泥岩烘干程度，对特定条件下膨胀率最终值的修正提供参考。

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	谢卓吾1
	凌斯祥1
	廖昕1
	巫锡勇1
	赵思远2
	陈明3
	段谦4

关键词 ：岩石力学, 川东红层泥岩, 热处理温度, 微观结构, 孔隙特征, 膨胀特性

Abstract：In this study，drying experiments at different temperatures were conducted to study the variations in the quality，fracture，pore，microstructure and expansion of upper-Shaximiao Formation red mudstone in eastern Sichuan Province. Field emission scanning electron microscope(SEM)，N2 adsorption measurement and digital radiography(DR) were used to evolution micro-structure，meso-pore and macro-fracture of rock samples during heat treatment，aiming to obtain the mass loss and expansion rules of rock samples reveal the influence of heat treatment on the expansion mechanism of red mudstone. The results show that：(1) the mass loss of rock samples presents two patterns as rapid water loss-slow water loss and slow water loss with the increase of heat treatment temperature. The complete water loss of the red mudstone requires a heat treatment temperature greater than 130 ℃. (2) Clay minerals exhibit interlayer opening and cracks along layers after high-temperature heat treatment，while they mainly show intralayer cracks after low-temperature heat treatment. The contribution of heat treatment temperature to macro cracks after heat treatment is low less than primary fissure. (3) The fine particles (0.5～2nm) in rock pores increase significantly with the decrease of heat treatment temperature，and the number of these particles reaches the peak at 110 ℃. Heat treatment temperature has an obvious effect on the micro-pore sizes of rocks. Compared with the single peak distribution of pores in natural state，the pore distribution after the high temperature heat treatment presents a bimodal type. (4) The expansion pattern under the low temperature treatment is mainly controlled by macro-fractures，while the expansion pattern under high temperature treatment is dominantly controlled by the macro-fractures and micro-pores. In addition，increasing the heat treatment temperature can significantly increase the curve slope and final expansion in the rapid expansion stage. The results reveal the characteristics of micro-structures and micro-pores and the development of macro-fractures under different heat treatment conditions and discuss the influence of heat treatment temperature on the expansion processes of upper-Shaximiao Formation red mudstone，which may provide a new insight into predicting the drying degree of mudstone and provide a reference to the correction of final expansion rate under specific heat treatment conditions.

Key words： rock mechanics red beds in East Sichuan drying temperature microstructure pore characteristics expansion characteristics

引用本文:

谢卓吾1，凌斯祥1，廖昕1，巫锡勇1，赵思远2，陈明3，段谦4. 不同热处理温度下红层泥岩的失重–膨胀机制研究[J]. 岩石力学与工程学报, 2023, 42(1): 154-167.
XIE Zhuowu1，LING Sixiang1，LIAO Xin1，WU Xiyong1，ZHAO Siyuan2，CHEN Ming3，DUAN Qian4. Study on the weightless-expansion mechanism of red-layer mudstone at different heat treatment temperatures. , 2023, 42(1): 154-167.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0371 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I1/154

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