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Impact of cooling rate on mechanical properties and failure mechanism of sandstone under thermal-mechanical coupling effect

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International Journal of Coal Science & Technology 2023年第2期10卷 97-116页

作者： pingye guo Peng Zhang Mohua Bu Hang Xing Manchao He State Key Laboratory for Geo-Mechanics and Deep Underground Engineering Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

High geo-temperature is one of the inevitable geological disasters in deep engineering such as resource extraction,space development,and energy *** of the key issues is to understand the mechanical properties and failure mechanism of high-temperature rock disturbed by low-temperature airflow after ***,.the experimental and numerical investigation were carried out to study the impact of cooling rate on mechanical properties and failure mechanism of high temperature ***,uniaxial compression experiments of high temperature sandstone at different real-time cooling rates were carried out to study the mechanical properties and failure *** experimental results indicate that the cooling rate has a significant effect on the mechanical properties and failure modes of *** peak strain,peak stress,and elastic modulus decrease with an increase in cooling rate,and the fragmentation degree after failure increases ***,the equivalent numerical model of heterogeneous sandstone was established using particle flow code(PFC)to reveal the failure *** results indicate that the sandstone is dominated by intragrain failure in the cooling stage,the number of microcracks is exponentially related to the cooling rate,and the higher the cooling rate,the more cracks are concentrated in the exterior *** axial loading,the tensile stress is mostly distributed along the radial direction,and the damage in the cooling stage is mostly due to the fracture of the radial *** addition,axial loading,temperature gradient and thermal stress mismatch between adjacent minerals are the main reasons for the damage of sandstone in the cooling ***,the excessive temperature gradient in the exterior region of the sandstone is the main reason for the damage concentration in this region.

关键词： High geo-temperature Thermo-mechanical coupling effect Cooling rate Sandstone PFC

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Field experimental study on the cooling effect of mine cooling system acquiring cold source from return air

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International Journal of Mining Science and Technology 2013年第3期23卷 453-456页

作者： guo pingye Chen Chen State Key Laboratory of Geomechanic and Deep Underground Engineering School of Mechanics & Civil Engineering China University of Mining & Technology

With the increase of mining depth, more and deeper coal mines are limited by heat disaster. The cooling energy in deep mine cooling system comes from mine water inrush or ground cooling tower, but we cannot adopt the two methods because mine water inrush in many old coal mines in China is limited. What is more, the cooling pipelines cannot be put in narrow pit-shaft. To settle the problem above, according to the characteristics of Zhangxiaolou Coal Mine, this paper adopts the deep mine return air as the cooling energy for deep mine cooling system. In addition, we carried out cite test to extract cold energy from return air. Through monitoring the water quantity, water temperature of cooling system and air temperature, we got the thermodynamic equilibrium parameters during the cooling energy acquisition analysis and the effect of cooling system that the temperature and humidity on working face are respectively reduced to 8-12 ℃ and 8-15% through cooling. This research offers experimental reference for deep mine cooling which lacks cooling energy.

关键词： Heat disaster Cold source Return air Cooling system

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Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone

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International Journal of Coal Science & Technology 2021年第5期8卷 956-968页

作者： pingye guo Juan Gu Yi Su Jiong Wang Zhanwen Ding State Key Laboratory for Geo-Mechanics and Deep Underground Engineering Beijing 100083China School of Mechanics Architecture and Civil EngineeringChina University of Mining and TechnologyBeijing 100083China Tang Steel International Engineering Technology Corp Tangshan 063000China China Henan Geological and Mineral Resources Construction Engineering(Group)Co. LtdZhengzhou 450007China

The understanding of the weakening mechanism of tensile strength of rock subjected to cyclic wetting-drying is critical for rock *** strength tests were conducted on a total of 35 sandstone specimens with different wetting-drying *** crack propagation process and acoustic emission characteristics of the tested samples were obtained through a high-speed camera and acoustic emission *** results indicate that the tensile strength is observably reduced after cyclic wetting-drying,and the extent of the reduction is not only related to the number of wettingdrying cycle,but also closely related to the clay mineral content of the *** addition,as the cycles of wetting-drying increase,the effect of each single cycle on tensile strength get reduced until it becomes ***,the crack initiation and penetration time is prolonged as the number of wetting-drying cycle increases,which indicates that cyclic wetting-drying weakens the rock stiffness and enhances the ductility of ***,the acoustic emission characteristics of the tested samples further confirmed the ductile behaviour of the sandstone samples with increasing wetting-drying ***,through the analysis of the microstructure and mineral composition of the samples with different wetting-drying cycles,it is concluded that the main weakening mechanisms of sandstones containing clay minerals are frictional reduction,chemical and corrosive deterioration.

关键词： Sandstone Wetting-drying cycle Tensile strength Weakening mechanism Failure characteristics

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Research and application of methods for effectiveness evaluation of mine cooling system

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International Journal of Mining Science and Technology 2015年第4期25卷 649-654页

作者： guo pingye Wang Yanwei Duan Mengmeng Pang Dongyang Li Nan State Key Laboratory of Geomechanics and Deep Underground Engineering School of Mechanics and Civil Engineering China University of Mining and Technology China Institute of Water Resources and Hydropower Research

Regarding the complexity and inconsistency of results in existing evaluation methods of mine cooling system, this paper clarifies the advantages, disadvantages and application of various mine cooling sys- tems through principle analysis, and divides all the cooling systems into air-cooling, ice-cooling and water-cooling according to the transportation of cold energy. On this basis, the paper proposes a simple and efficient evaluation method for mine cooling system. The first index of this method is the air temper- ature at point C which is 15 m away from the return wind corner at working face. A cooling system will be judged ineligible if the air temperature at point C is above 30 ℃ during operation, because in this case, the combustible gases in coal will sharply overflow, inducing gas incidents. Based on the preliminary judg- ment of the first index, another two evaluation indexes are proposed based on the cooling ability and dehumidification of an airflow volume of 1000 m3/min at point C to evaluate the investment and opera- tion cost of mine cooling system. This evaluation method has already been successfully applied in the cooling system design of Zhangshuanglou coal mine.

关键词： Cooling system Effectiveness Evaluation Index system

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HEMS technique for heat-harm control and geo-thermal utilization in deep mines

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International Journal of Coal Science & Technology 2014年第3期1卷 289-296页

作者： pingye guo guolong Zhu Manchao He State Key Laboratory of Geomechanics and Deep Underground Engineering Beijing 100083China

With the increasing exploitation scope and intensity,the shallow resources would be exhausted in the future;and the deep mining will become an essential *** deep tunnel engineering,the heat-harm becomes one of the *** on high temperature coal mine have been done in Nothem China,with the construting of threemodels of high temperature mines suffering heat-harm,at the Jiahe mine,Sanhejian mine and Zhangshuanglou *** and abroad cooling technologies of the mine respectively are also summarized after comparatively analyzing theadvantages and disadvantages of each ***,we find that the high temperature exchange machinery system(HEMS)technology that use mine discharge as the cold source,is excellent to heat-ham control in deep *** theJiahe coal mine as an example,we systematically introduce this teclnology by disposing three main *** with its operations and functions in different exploitation levels are accomplished,including the extraction ofrefrigerating output,the transportation of chilled water by closed circulation line,the decompression of circulation linesand equipment by pressure transformation machine,and the heat exchange and cooling of workplace by heat exchangebetween wind stream and the chilled *** exchanged heat source from the workplace is taken to ground heating bythe circulating water which acts as a *** shows that the HEMS-technology benefit in environment protection andemission *** of this project illustrate that it is efficient in heat-ham control with the temperature decrease ofthe workplace down to 26-29℃,and being 4-6℃ lower than the original,and the relative humidity 5%-15%lowerthan *** greatly improves the working environment of underground workplace suffering heat-ham of high tem-perature and high *** addition,by the extracting of deep geothermal enery,ground fired boiler for heating hasbeen replaced,reducing environment

关键词： Deep mine High temperature Heat-harm control Mine discharge Deep geothemal energy Hightemperature exchange machinery system(HEMS)

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Field experiment on coalmine heat disaster governance using cold source from surface water

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International Journal of Mining Science and Technology 2014年第6期24卷 865-869页

作者： guo pingye Zhu guolong Liu Yuqing Duan Mengmeng Wu Junyin State Key Laboratory of Deep Geomechanics and Underground Engineering China University of Mining & Technology National Energy Key Laboratory of Safe Mining and Disaster Control

Regarding the lack of cold source for underground cooling systems from either mine inflow or return air, field experiments were taken in a high temperature deep coal mine with abundant cold source from surface water. Taking Sanhejian coal mine as an example, this paper introduced the technology scheme of heat disaster governance using surface water cold source. The paper presents the basics of this field experiment at the beginning, following by the design and site layout of the cooling system including the analysis and calculation of cold source. Numerical calculation method is also applied based on the operation parameters to simulate the influence to the surface river ecosystem. The results suggest that the temperature of surface water shall be lower than 34 ℃ after heat exchange, and when more cooling capacities are needed in the future, increasing the water flow is more favorable than increasing the cooling range of water, which is better for the ecological environment protection,

关键词： Deep mine Heat disaster Surface water Cold source

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废弃矿井地下空间反季节循环储能研究

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煤炭学报 2022年第6期47卷 2193-2206页

作者：郭平业王蒙孙晓明何满潮深部岩土力学与地下工程国家重点实验室北京100083 中国矿业大学(北京)力学与建筑工程学院北京100083

随着我国“碳达峰,碳中和”目标的提出,煤炭在一次能源消费结构中的比例逐步下降,关停矿井数量逐年增多。直接关闭或废弃矿井不仅造成巨大的资源浪费,还极有可能诱发一系列的安全、环境等问题,需要因地制宜的提出符合我国废弃矿井现状... 详细信息

随着我国“碳达峰,碳中和”目标的提出,煤炭在一次能源消费结构中的比例逐步下降,关停矿井数量逐年增多。直接关闭或废弃矿井不仅造成巨大的资源浪费,还极有可能诱发一系列的安全、环境等问题,需要因地制宜的提出符合我国废弃矿井现状的剩余资源开发利用模式。基于此,系统梳理了国内外废弃矿井开发再利用现状,着重讨论了废弃矿井地下空间储能的利用模式,针对性的提出了废弃矿井反季节循环储能工艺系统,该系统充分考虑了废弃矿井地下空间资源、地热资源、水资源和地上可再生资源,通过在沉陷区布置太阳能和风能发电设备,为周边用户和整个系统提供电能,以井下恒温岩土体中的巷道群和采空区为储能空间,以矿井水为储能介质,通过太阳能集热和地热能资源为周边用户供热/制冷,在无需供热/制冷的季节将热能储存至矿井地下,实现反季节循环储能。阐述了废弃矿井地下反季节循环储能亟需突破的3个关键技术:多尺度空间热储评估方法、废弃矿井反季节循环储能井上井下整体优化设计方法以及反季节循环储能多源耦合的运行模式。最后,以京西王平村废弃矿井为例研究了该系统的节能减排效益,结果表明:与传统化石燃料相比,应用反季节循环储能系统供热制冷,每年可减排二氧化碳约2781.1 t。若加入太阳能、风能集热发电系统,节能减排效果将更加明显。应高度重视废弃矿井资源开发利用,加大废弃矿井资源开发利用科学问题的研究力度。相关部门和矿山企业应积极稳步推进废弃矿井绿色低碳开发利用,提高可再生清洁能源利用比例,实施碳排放总量和强度“双控”,为国家“双碳”目标的实现提供助力。

关键词：废弃矿井地下空间反季节循环储能地热资源清洁能源

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Evaluation method of underground water storage space and thermal reservoir model in abandoned mine

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Rock Mechanics Bulletin 2023年第2期2卷 84-97页

作者： pingye guo Meng Wang Guanjie Dang Tianci Zhu Jie Wang Manchao He State Key Laboratory for Geo-Mechanics and Deep Underground Engineering 100083BeijingChina School of Mechanics Architecture and Civil EngineeringChina University of Mining and Technology100083BeijingChina

A large number of mines are closed or abandoned every year in *** utilization is one of the important ways to efficiently reuse underground resources in abandoned *** to calculate the volume and distribution of underground water storage space is the key to accurately evaluate the sustainable geothermal production in abandoned *** this paper,according to the multi-scale characteristics of the underground space in abandoned mine,the flow and heat transfer equations in the multi-scale space are sorted out systematically,and the calculation methods of different secondary space volumes are derived in *** Jiahe abandoned mine as the background,the volume and distribution of underground secondary space are calculated,and three heat storage evaluation models considering different water storage spaces are established by using *** simulation results show that there are great differences among different models,and the results of the equivalent porous media model considering the multi-scale space are most consistent with the *** analyses of key parameters model results indicated that the heat production is closely related to not only the recharge flow rate but also the recharge temperature and operating ***,the energy saving and emission reduction benefits of geothermal utilization in abandoned mines are calculated,the results show that geothermal utilization of abandoned mines can effectively reduce energy consumption and CO_(2)emissions,and it has great economic benefits.

关键词： Abandoned mine Thermal reservoir model Underground water storage space Heat production Sustainability

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高地温隧道灾变机制与灾害防控研究进展

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岩石力学与工程学报 2023年第7期42卷 1561-1581页

作者：郭平业卜墨华张鹏李清波何满潮中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室北京100083 中国矿业大学(北京)力学与建筑工程学院北京100083

随着隧道工程向着“深、大、长”的方向发展,高地温成为隧道建设不可避免的地质灾害之一。从高地温隧道的主要灾害形式、分类分级标准和灾害防控技术3个方面对相关文献进行归纳,总结已有研究成果。高地温主要致灾形式包括导致隧道内部... 详细信息

随着隧道工程向着“深、大、长”的方向发展,高地温成为隧道建设不可避免的地质灾害之一。从高地温隧道的主要灾害形式、分类分级标准和灾害防控技术3个方面对相关文献进行归纳,总结已有研究成果。高地温主要致灾形式包括导致隧道内部湿热环境、加剧隧道围岩变形与破坏和诱发隧道支护结构失效。已有地下工程的热害分类分级标准主要以围岩温度和隧道内环境温度为依据,重点考虑高地温造成的热环境对施工人员健康的影响,忽略了高地温对围岩和支护结构的影响,且未能考虑高温涌水。高地温隧道湿热环境调控技术包括非人工制冷降温技术和人工制冷降温技术,探索适合高温环境的支护结构形式、技术与材料是控制围岩变形与破坏和预防支护结构失效的主要途径。西南地区是我国面临高地温灾害的重要区域之一,具有超高岩温、高温涌水、超长距离通风和高原高寒气候等特征,综合考虑该地区高地温诱发的灾害类型,提出以干热型和水热型为两大类的高地温隧道热害分类分级标准。在此基础上,结合“对症下药,分类防治”的高地温隧道热害防控原则,探索了西南地区极端高地温隧道灾害防控对策。

关键词：隧道工程高地温灾变机制灾害控制湿热环境

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深部岩体热力学效应及温控对策

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岩石力学与工程学报 2013年第12期32卷 2377-2393页

作者：何满潮郭平业中国矿业大学深部岩土力学与地下工程国家重点实验室北京100083

随着开采深度的加大地温越来越高，高地温引起的深部岩体热力学效应引发许多深部矿山开采的次生灾害，有必要研究高温矿井相关的岩石力学问题。首先提出我国深部矿井地温场的3种模式即线性模式、非线性模式和异常模式；然后通过室内试... 详细信息

随着开采深度的加大地温越来越高，高地温引起的深部岩体热力学效应引发许多深部矿山开采的次生灾害，有必要研究高温矿井相关的岩石力学问题。首先提出我国深部矿井地温场的3种模式即线性模式、非线性模式和异常模式；然后通过室内试验，研究温度对深部岩石强度和吸附气体逸出的影响，试验结果表明，随着温度的升高，煤岩强度和弹性模量显著降低，同时吸附瓦斯变为游离瓦斯而逸出，这是引起煤矿塌方和瓦斯灾害的重要内在原因；同时，在概述国内外温控技术基础上，提出以矿井涌水为冷源的HEMS降温原理及技术，形成3种典型温控模式及其设备系统。现场降温试验系统运行后效果良好，工作面温度控制在29℃以内，工作面温度降低5℃～12℃，相对湿度降低5％～15％；针对目前国内外矿井降温系统尚无有效性评价问题，提出矿井降温系统有效性评价的参数体系及方法。

关键词：岩石力学岩体热力学深部岩体温度效应降温系统有效性评价

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