干湿循环下煤矸石土石混合体大型直剪试验研究

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摘要煤炭开挖和选煤过程中产生大量煤矸石，堆积于地表的煤矸石易受到环境的影响引发灾害。目前，干湿循环条件下煤矸石土石混合体的强度特性研究较少。通过大型直剪试验，探究干湿循环和含石量对煤矸石土石混合体强度特性的作用机制；揭示含石量( )和干湿循环次数对土石混合体积变化及相对破碎率( )的影响规律；建立干湿循环下土石混合体抗剪强度劣化方程。试验结果表明，随着含石量的提高，煤矸石土石混合体的内摩擦角呈现线性增加，而黏聚力则呈现出下降趋势；煤矸石土石混合体在剪切过程中呈现明显的剪切收缩现象；煤矸石土石混合体的剪切强度和法向应变最大值随着含石量的增加而增加，并随着干湿循环次数的增加而减小。首次干湿循环对土石混合体的抗剪强度劣化作用显著，3次干湿循环后土石混合体抗剪强度变化不明显；干湿循环加剧了土石混合体中岩块的破碎趋势，提高岩块的，导致土壤颗粒含量(粒径＜5 mm)增加。高法向应力下( = 800 kPa)，随干湿循环次数增加而提高，而低法向应力下( = 200 kPa)干湿循环对岩块破碎影响有限。

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	刘红位1
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	游诗琪1
	简文彬1
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	黄云1
	冯嵩4
	邓涛4

关键词 ：岩石力学, 煤矸石, 土石混合体, 干湿循环, 剪切强度, 相对破碎率

Abstract：

A large amount of coal gangue is generated during coal excavation and preparation. The coal gangue accumulates on the ground surface and is easily affected by environment and causes disasters. The mechanism of the effects of drying-wetting cycles and stone content on the strength characteristics of coal gangue is investigated through large-scale direct shear tests. The influence of proportion of rock( ) and the number of drying and wetting on the volume and relative breakage rate( ) of soil-rock mixture was revealed. The equation of shear strength degradation of soil-rock mixture under drying-wetting cycles was established. The test results showed that as the rock content increases，the internal friction angle of the coal gangue soil-rock mixture increased linearly，while the cohesion exhibited a downward trend. The gangue soil-rock mixture exhibited obvious shear shrinkage during the shear process. The shear strength and maximum normal strain of the mixture increased with an increase in rock content but decrease with the number of drying-wetting cycles. The shear strength of the soil-rock mixture significantly deteriorated during the first drying-wetting cycle，and it did not change significantly after three drying-wetting cycles. The drying-wetting cycle enhanced the fragmentation tendency of rock in the soil-rock mixture，raised the of the rock，and increased the content of soil particles(particle size＜5 mm). The increased with the number of drying-wetting cycles，while under low normal stress( = 200 kPa)，the drying-wetting cycles had a limited impact on rock fragmentation.

Key words： rock mechanics coal gangue soil-rock mixture drying- wetting cycles shear strength relative breakage rate

引用本文:

刘红位1，2，3，游诗琪1，简文彬1，2，3，黄云1，冯嵩4，邓涛4. 干湿循环下煤矸石土石混合体大型直剪试验研究[J]. 岩石力学与工程学报, 2025, 44(2): 331-341.
LIU Hongwei1，2，3，YOU Shiqi1，JIAN Wenbin1，2，3，HUANG Yun1，FENG Song4，DENG Tao4. Study on large direct shear test of coal gangue soil-rock mixture under wetting-drying cycles. , 2025, 44(2): 331-341.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I2/331

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