不同相态CO2吸附作用下煤体力学性能研究

doi:10.13722/j.cnki.jrme.2023.0820

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摘要为了探究不同相态CO2注入难开采煤层对煤体力学性能的影响。以内蒙古敏东一矿矿区为例，将煤样放入自制的三轴吸附渗透仪中，通过调控温度和压力进行不同相态CO2对煤样的吸附试验，模拟在复杂地应力条件下不同相态CO2在难开采煤层的吸附过程。通过对吸附后的煤样进行单轴压缩试验，辅以声发射装置。得到煤体抗压强度、弹性模量和声发射能量的变化情况。定义煤体抗压强度、弹性模量劣化度，并以未吸附CO2的煤样破裂声发射累计能量为基准线，划分高能量区与低能量区，得到不同相态CO2吸附后煤样的破裂行为及损伤特征的演化规律。研究结果表明：(1) CO2吸附会减弱煤样的力学参数，导致煤体宏观破坏特征发生变化，降低其力学性能，CO2吸附作用下煤体抗压强度的总劣化度范围为11.72%～70.89%。(2) CO2吸附作用下煤体弹性模量的总劣化度范围为8.42%～43.07%，不同相态CO2吸附作用下煤体总劣化度情况为：超临界态吸附组＞液态吸附组＞气态吸附组。(3) 经CO2吸附后的煤样，内部形成更多的孔隙和裂隙，致使初始压密时间变长，同时煤样的弹性变形能力减弱，经气态CO2吸附后煤样弹性阶段持续时间为经液态CO2吸附后煤样2倍，为经超临界态CO2吸附后煤样4倍。(4) 经CO2吸附后的煤样，未经CO2吸附的煤样声发射总能量为基准线，划分高能量区与低能量区声发射累计能量均处在高能量区，较未吸附煤样相比，均产生了一定程度的破裂。

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	唐巨鹏1
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关键词 ：采矿工程, 不同相态二氧化碳吸附, 单轴压缩, 声发射能量, 劣化度

Abstract：In order to investigate the effect of different phases of CO2 injected into difficult-to-mining coal seams on the mechanical properties of coal bodies. Taking the mining area of Inner Mongolia Mindong I Mine as an example，coal samples were put into a homemade triaxial adsorption and permeation apparatus，and the adsorption test of different phases of CO2 on the coal samples was carried out by regulating the temperature and pressure，so as to simulate the adsorption process of different phases of CO2 on the difficult-to-explore coal seams under the complex ground stress conditions. The uniaxial compression test was carried out on adsorbed coal samples，supplemented by an acoustic emission device. Changes in compressive strength，modulus of elasticity and acoustic emission energy of the coal body were obtained. Define the degradation of compressive strength and modulus of elasticity of the coal body，and take the cumulative energy of rupture acoustic emission of coal samples without CO2 adsorption as the baseline，and divide the high-energy zone and low-energy zone to get the evolution law of rupture behaviours and damage characteristics of coal samples after CO2 adsorption in different phases. The results show that：(1) CO2 adsorption weakens the mechanical parameters of coal samples, leading to changes in the macroscopic damage characteristics of the coal body and reducing its mechanical properties，and the total deterioration of the compressive strength of the coal body under the effect of CO2 adsorption ranges from 11.72% to 70.89%. (2) The total degradation of the elastic modulus of the coal body under CO2 adsorption ranges from 8.42% to 43.07%，and the total degradation of the coal body under CO2 adsorption in different phases is as follows：supercritical state adsorption group＞liquid state adsorption group＞gas state adsorption group. (3) After CO2 adsorption，more pores and fissures were formed inside the coal samples，resulting in a longer initial compaction time，and at the same time, the elastic deformation ability of the coal samples was weakened，and the elasticity stage of the coal samples adsorbed by gaseous CO2 lasted twice as long as that of the coal samples adsorbed by liquid CO2，and four times as long as that of the coal samples adsorbed by supercritical CO2. (4) Coal samples adsorbed by CO2，without CO2 adsorption of the total acoustic emission energy of the coal samples as a baseline，the division of high-energy and low-energy areas acoustic emission cumulative energy are in the high-energy area，compared with the unadsorbed coal samples，are produced to a certain extent of the rupture.

Key words： mining engineering adsorption of carbon dioxide in different phases uniaxial compression acoustic emission energy deterioration degree

引用本文:

唐巨鹏1，2，张枭1，赖堂锐1，余泓浩1. 不同相态CO2吸附作用下煤体力学性能研究[J]. 岩石力学与工程学报, 2024, 43(S2): 3621-3632.
TANG Jupeng1，2，ZHANG Xiao1，LAI Tangrui1，YU Honghao1. Study on the mechanical properties of coal under the adsorption of CO2 in different phase states. , 2024, 43(S2): 3621-3632.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0820 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3621

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