采动煤岩卸荷损伤演化的红外辐射响应机制及其量化表征研究

The permeability evaluation of mining coal and rock is the key part of water protection coal mining, but it can be evaluated indirectly and effectively by quantitative characterization of coal and rock damage evolution. Previous studies of applicant have found that the infrared radiation information has significant synchronous response characteristics during the damage evolution process of coal and rock. Accordingly, a new idea of “using the infrared radiation response information of the surface to characterize the damage evolution during the damage process of coal and rock” is proposed in this project, the multi field infrared radiation observation device developed by ourselves will be used to observe the meso damage and the variation regularity of infrared radiation information response of coal and rock under mining stress paths, and the correlation between the damage parameter of mining unloading coal and rock and the infrared radiation response information will be obtained, and the infrared radiation stress sensitive bands and sensitive indicators in the evolution process of unloading damage of coal and rock will be determined, and the quantified relations between infrared radiation sensitive indicators and damage parameter will be established, and the infrared radiation response mechanism of the unloading damage evolution of coal and rock will be revealed. Moreover, a dynamic evolution model of unloading damage coal and rock which is based on the infrared radiation response information will be constructed, and the infrared radiation quantitative characterization method of unloading damage of coal and rock will be established, which can provide theoretical basis for the permeability evaluation of coal and rock during the process of water protection coal mining.

采动煤岩的渗透性评价是保水采煤的关键环节，而定量表征采动煤岩损伤演化是间接评价煤岩渗透性的有效途径。申请人前期研究发现，煤岩在损伤演化过程中，其表面红外辐射信息具有显著的同步响应特征。据此，本项目提出“利用采动煤岩损伤过程中表面红外辐射响应信息来表征损伤演化”的新思路，采用自主研制的多场红外辐射观测装置，研究采动应力路径下煤岩的细观损伤特征及红外辐射响应信息的变化规律，获取采动卸荷煤岩的损伤参量与红外辐射响应信息之间的表象关联，确定采动煤岩卸荷损伤演化过程中红外辐射的应力敏感波段和敏感指标；建立煤岩的红外辐射敏感指标与损伤参量之间的量化关系，揭示煤岩卸荷损伤演化过程中的红外辐射响应机制；构建基于红外辐射响应信息的采动煤岩卸荷损伤动态演化模型，建立采动煤岩卸荷损伤演化的红外辐射量化表征方法，为保水采煤过程中采动煤岩渗透性评价提供理论基础。

采动煤岩的渗透性评价是保水采煤的关键环节，而定量表征采动煤岩损伤演化是间接评价煤岩渗透性的有效途径。申请人前期研究发现，煤岩在损伤演化过程中，其表面红外辐射信息具有显著的同步响应特征。据此，本项目提出“利用采动煤岩损伤过程中表面红外辐射响应信息来表征损伤演化”的新思路，采用自主研制的多场红外辐射观测装置，研究了采动应力路径下煤岩的细观损伤特征及红外辐射响应信息的变化规律，阐明了损伤累积诱发煤岩破坏的红外辐射突变特征；提出了红外辐射耗散能、高温点比例因子和红外辐射b值等煤岩损伤破坏的红外敏感指标，揭示了采动应力对红外辐射的控制效应，以及体积应变增量与红外辐射的线性关系，确立了煤岩损伤过程中“初始破坏”、“临界破坏”的红外辐射时空前兆判据。基于塑性应变能和变形功转换方程，表征了裂纹塑性区的温度源密度函数，建立了煤岩内部裂纹扩展致热的表面红外辐射响应模型，阐释了煤岩表面红外响应信息与其内部损伤演化的同源异相响应机制。提出了采动煤岩红外辐射温度场中裂纹扩展致热的阈值分割方法，分离出了采动煤岩内部损伤的表面红外辐射响应信息；确立了煤岩损伤红外响应信息与其塑性耗散能的线性相关关系，建立了基于红外辐射计数的煤岩损伤演化量化表征模型，创建了基于红外损伤参量修正的煤岩三维塑性本构关系，实现了采动煤岩卸荷损伤演化行为的红外辐射精确标定，为工程岩体力学分析提供了精确实用的技术手段。发表高水平学术论文17篇，其中SCI收录15篇（JCR一/二区）、EI收录1篇；获授权发明专利6件；获批团体标准1项、软件著作权2项；中国煤炭工业科学技术一等奖2项、绿色矿山科技进步一等奖1项、省级科技进步二等奖3项。研究结果丰富了岩石力学基础理论，为保水采煤过程中的煤岩渗透性评价提供了理论支持，为岩体工程及自然地质隐蔽致灾因素的无损探测提供了一种可供选择的新技术手段。