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Using true‑triaxial stress path to simulate excavation‑induced rock damage:a case study

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International Journal of Coal Science & Technology 2022年第4期9卷 165-180页

作者： qingsheng bai Cun Zhang R.Paul Young State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Geotechnical Institute TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany School of Resource and Safety Engineering China University of Mining and Technology(Beijing)BeijingChina Department of Civil and Mineral Engineering University of TorontoTorontoCanada

This study presents an example illustrating the role of in situ 3D stress path method in simulating the roof damage development observed in the Mine-by tunnel at Underground Research Laboratory(URL)located in Manitoba,*** 3D stress path,at the point 1 cm in the crown of the Mine-by tunnel,was applied to a cubic Lac du Bonnet(LdB)granite sample to further understand the roof damage process and the associated *** careful calibrations,a numerical model was used to reproduce the experiment,which produced similar seismicity processes and source *** emission(AE)events obtained from laboratory and numerical modeling were converted to locations in relation to the tunnel face and were compared to the feld microseismicity(MS)occurring in the upper notch region of the Mine-by *** crack development and damage mechanism are carefully *** diference between tests and feld monitoring was *** intermediate principal stress(σ_(2))unloading process was carried out in numerical simulation to investigate its role in rock damage *** results clearly showedσ_(2)could play a signifcant role both in damage development and failure *** should be considered when predicting the damage region in underground *** study highlights the potential role of laboratory and numerical stress path tests to investigate fracture processes and mechanisms occurring during engineering activities such as tunnel excavation.

关键词： Acoustic emission Damage development In situ 3D stress path Numerical simulation True-triaxial experiment

Strength weakening and its micromechanism in water–rock interaction,a short review in laboratory tests

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International Journal of Coal Science & Technology 2023年第1期10卷 18-32页

作者： Cun Zhang qingsheng bai Penghua Han Lei Wang Xiaojie Wang Fangtian Wang School of Energy and Mining Engineering China Universityof Mining and Technology(Beijing)Beijing 100083China Institute of Geotechnics TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany School of Mines China University of Miningand TechnologyXuzhou 221116China

Water–rock interaction(WRI)is a topic of interest in geology and geotechnical *** geological hazards and engineering safety problems are severe under the *** study focuses on the water weakening of rock strength and its infuencing factors(water content,immersion time,and wetting–drying cycles).The strength of the rock mass decreases to varying degrees with water content,immersion time,and wetting–drying cycles depending on the rock mass type and mineral *** corresponding acoustic emission count and intensity and infrared radiation intensity also weaken *** enhances the plasticity of rock mass and reduces its *** microscopic methods for studying the pore characterization and weakening mechanism of the WRI were compared and *** methods should be adopted to study the pore evolution of WRI *** methods are used to study the weakening mechanism of *** future work,the mechanical parameters of rocks weakened under long-term water immersion(over years)should be considered,and more attention should be paid to how the laboratory scale is applied to the engineering scale.

关键词： Water–rock interaction Weakening mechanism Water content Immersion time Wetting–drying cycles Microscopic methods

Theoretical analysis on the deformation characteristics of coal wall in a longwall top coal caving face

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International Journal of Mining Science and Technology 2015年第2期25卷 199-204页

作者： bai qingsheng Tu Shihao Li Zhaoxin Tu Hongsheng School of Mines Key Laboratory of Deep Coal ResourceMinistry of EducationChina University of Mining & Technology

Against the background of analyzing coal wall stability in 14101 fully mechanized longwall top coal caving face in Majialiang coal mine,based on the torque equilibrium of the coal wall,shield support and the roof strata,an elastic mechanics model was established to calculate the stress applied on the coal *** displacement method was used to obtain the stress and deformation distributions of the coal *** study also researched the influence of support resistance,protective pressure to the coal wall,fracture position of the main roof and mining height on the coal wall *** following conclusions are drawn:(1) The shorter the distance from the longwall face,the greater the vertical compressive stress and horizontal tensile stress borne by the coal *** coal wall is prone to failure in the form of compressive-shear and tension;(2) With increasing support resistance,the revolution angle of the main roof decreases *** the support resistance and protective force supplied by the face guard increases,the maximum deformation of the coal wall decreases linearly;(3) As the face approaches the fracture position of the main roof,coal wall horizontal deformation increases significantly,and the coal wall is prone to instability;and(4) The best mining height of 14101 longwall face is 3.0 m.

关键词：综采放顶煤变形特性煤壁采面弹性力学模型综采工作面应力和顶板岩层

Hydraulic support crushed mechanism for the shallow seam mining face under the roadway pillars of room mining goaf

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International Journal of Mining Science and Technology 2017年第5期27卷 853-860页

作者： Wang Fangtian Duan Chaohua Tu Shihao Liang Ningning bai qingsheng State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining&TechnologyXuzhou 221116China School of Economics and Management Longyan UniversityLongyan 364000China

While the fully-mechanized longwall mining technology was employed in a shallow seam under a room mining goaf and overlained by thin bedrock and thick loose sands, the roadway pillars in the abandoned room mining goaf were in a stress-concentrated state, which may cause abnormal roof weighting, violent ground pressure behaviours, even roof fall and hydraulic support crushed(HSC) accidents. In this case,longwall mining safety and efficiency were seriously challenged. Based on the HSC accidents occurred during the longwall mining of 3-1-2 seam, which locates under the intersection zone of roadway pillars in the room mining goaf of 3-1-1 seam, this paper employed ground rock mechanics to analyse the overlying strata structure movement rules and presented the main influence factors and determination methods for the hydraulic support working resistance. The FLAC3 D software was used to simulate the overlying strata stress and plastic zone distribution characteristics. Field observation was implemented to contrastively analyse the hydraulic support working resistance distribution rules under the roadway pillars in strike direction, normal room mining goaf, roadway pillars in dip direction and intersection zone of roadway pillars. The results indicate that the key strata break along with rotations and reactions of the coal pillars deliver a larger concentrated load to the hydraulic support under intersection zone of roadway pillars than other conditions. The ‘‘overburden strata-key strata-roadway pillars-immediate roof" integrated load has exceeded the yield load that leads to HSC accidents. Findings in HSC mechanism provide a reasonable basis for shallow seam mining, and have important significance for the implementation of safe and efficient mining.

关键词： Shallow seam Room mining goaf Longwall mining Hydraulic support crushed mechanism Safe and efficient mining

Suitable retention and recovery technology of floor coal at ends of fully mechanized face with great mining heights

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Mining Science and Technology 2011年第2期21卷 281-285页

作者： Zhang Nenghu Wu Qi YuanYong bai qingsheng School of Mines China University of Mining ＆ Technology Xuzhou 221116 China Xishan Coal Electricity Group Co. Ltd. Taiyuan 030053 China

在大采矿高度的脸的网关主要沿着煤缝接的房顶被驾驶。为网关高度限制， 13 m 地板煤被保留，离开在脸结束的三角形的地板煤，引起煤的损失。为了改进煤恢复率并且在煤采矿保证设备的效率，面对，我们在脸结束调查了合适的保留方法和地... 详细信息

在大采矿高度的脸的网关主要沿着煤缝接的房顶被驾驶。为网关高度限制， 13 m 地板煤被保留，离开在脸结束的三角形的地板煤，引起煤的损失。为了改进煤恢复率并且在煤采矿保证设备的效率，面对，我们在脸结束调查了合适的保留方法和地板煤的恢复技术。上面的地板煤能被 shearer 直接与地板 dinting 恢复。在推进了地板 dinting 以后，更低的地板煤被 shearer 与地板 dinting 恢复并且为在一道拖拽网关保护煤方面保留步。地实践证明这个方法能改进恢复与大采矿高度在充分使机械化的工作的脸评估的煤。

关键词：开采高度恢复技术综采工作面地板煤层煤炭回采率顶部驱动保存方法

Overburden fracture evolution laws and water-controlling technologies in mining very thick coal seam under water-rich roof

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International Journal of Mining Science and Technology 2013年第5期23卷 693-700页

作者： Zhang Youxi Tu Shihao bai qingsheng Li Jianjun School of Mines Key Laboratory of Deep Coal ResourceMinistry of Education of ChinaChina University of Mining & Technology Datong Coal Mine Group Co.Ltd.

Considering the danger of water inrush in mining very thick coal seam under water-rich roof in Majialiang Coal Mine,the universal discrete element(UDEC)software was used to simulate the overburden fracture evolution laws when mining 4#coal ***,this study researched on the influence of face advancing length,speed and mining height on the height of the water flowing fractured zones(HWFFZ),and analyzed the correlation of face advancing length and change rules of aquifer water levels and goaf water *** on those mentioned above,this research proposed the following water-controlling technologies:draining the roof water before mining,draining goaf water,reasonable advancing speed and mining *** water-controlling technologies were successfully used in the feld,thus ensured safely mining the very thick coal seam under water-rich roof.

关键词： Water-rich roof Very thick coal seam Mining induced fracture Evolution law Water-controlling technology

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顶煤成拱机理的数值模拟研究

采矿与安全工程学报 2014年第2期31卷 208-213页

作者：白庆升屠世浩王沉中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室江苏徐州221116

在分析支架后上方顶煤及直接顶破碎、冒落特性和运动准则的基础上,建立了放顶煤的离散元数值模拟模型。从煤岩块体运动特性和接触力场演化规律2个方面论述了顶煤架后成拱机理:1)顶煤成拱的运动学机理为:在放煤口上方存在一个顶煤运动高... 详细信息

在分析支架后上方顶煤及直接顶破碎、冒落特性和运动准则的基础上,建立了放顶煤的离散元数值模拟模型。从煤岩块体运动特性和接触力场演化规律2个方面论述了顶煤架后成拱机理:1)顶煤成拱的运动学机理为:在放煤口上方存在一个顶煤运动高速区,其两侧块体的运动速度较小,局部顶煤块体在放煤口两侧产生"淤积",从而在放煤口上方形成不稳定接触力拱,造成放煤口附近顶煤运移速度减小,当更高层位的大块顶煤涌向放煤口时,容易产生挤压成拱;2)顶煤成拱的力学机理为:散体顶煤的放出过程,可以看做是接触力拱不断形成和破坏的过程,当上位接触压力大于成拱块体间由挤压而产生的摩擦阻力时,接触力拱破坏,否则,形成稳定的接触力拱,堵塞放煤口。现场观测验证了上述理论分析。

关键词：放顶煤成拱机理数值模拟现场观测

深部高瓦斯矿井保护层少矸化“采选充+抽”开采技术

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采矿与安全工程学报 2020年第1期37卷 93-100页

作者：郝定溢白庆升李文龙杨振乾中国矿业大学矿业工程学院江苏徐州221116

针对深部"采选充+抽"一体化矿井中以岩层为保护层和矸石不出井的技术难题,分析提出了此类矿井保护层少矸化时空协调开采技术。以平煤十二矿为例,首先根据提出的保护层少矸化时空协调开采技术确定了保护层的层位;利用考虑含瓦斯煤岩体的... 详细信息

针对深部"采选充+抽"一体化矿井中以岩层为保护层和矸石不出井的技术难题,分析提出了此类矿井保护层少矸化时空协调开采技术。以平煤十二矿为例,首先根据提出的保护层少矸化时空协调开采技术确定了保护层的层位;利用考虑含瓦斯煤岩体的骨架可变形性和气体可压缩性的固气耦合模型,数值模拟研究了保护层少矸化开采厚度对被保护层工作面膨胀变形率、应力和瓦斯压力变化特征等的影响,优化了保护层采厚;最后依据卸压保护角和保护层采厚等参数确定了保护层工作面长度,并分析井下煤矸物流系统和就地分选及充填系统。针对得出的保护层少矸化开采参数,从卸压增透的时效性和少矸化两个方面分析了保护层少矸化时空协调开采效果。

关键词： “采选充+抽” 保护层开采少矸化时空协调

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深部“三软”煤层回采巷道断面优化研究

中国矿业大学学报 2015年第1期44卷 9-15页

作者：王沉屠世浩李召鑫白庆升屠洪盛中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室中澳矿业研究中心江苏徐州221116

针对淮北矿区深部"三软"煤层工作面半圆拱梯形巷道超前支护工艺复杂的技术难题,以邹庄矿3204首采工作面的高产高效开采实际为背景,提出了利用"平顶+双圆弧"代替半圆拱的断面优化模式,开发了平顶U形巷道断面,运用理论分析、数值模拟并结... 详细信息

针对淮北矿区深部"三软"煤层工作面半圆拱梯形巷道超前支护工艺复杂的技术难题,以邹庄矿3204首采工作面的高产高效开采实际为背景,提出了利用"平顶+双圆弧"代替半圆拱的断面优化模式,开发了平顶U形巷道断面,运用理论分析、数值模拟并结合现场实测资料,研究了断面优化的理论基础并提出了优化高度的概念.结果表明:合理选择优化高度能够降低巷道围岩应力集中程度,提高"三软"巷道的整体稳定性及端头替棚效率;消除木垛架棚工艺并满足设备结构尺寸的优化高度h0应满足:0.9m

关键词： “三软” 优化高度平顶U形数值模拟采煤工艺