气煤叠置区埋地管道的保护煤柱优化设计及多参量演化规律研究  

Investigation on protective coal pillar optimization and multi-parameterevolution characteristics of buried pipeline in gas-coal superposition area

作　　者：任建东 赵毅鑫 孙中博[1,2] 王文 刘世民[4] REN Jian-dong;ZHAO Yi-xin;SUN Zhong-bo;WANG Wen;LIU Shimin(Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Energy and Mining,China University of Mining and Technology(Beijing),Beijing 100083 China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454003,China;Department of Energy and Mineral Engineering,Pennsylvania State University,Pennsylvania State 16802 USA)

机构地区：[1]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083 [2]中国矿业大学(北京)能源与矿业学院,北京100083 [3]河南理工大学,能源科学与工程学院,焦作河南454003 [4]宾夕法尼亚州立大学,能源与矿业工程系,美国宾夕法尼亚州16802

出　　处：《岩土力学》2023年第9期2679-2695,共17页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51874312);研究生科研创新能力提升项目(No.2022YJSNY02)。

摘　　要：为了优化采煤沉陷区内浅埋管道保护煤柱的宽度,以鄂尔多斯盆地气煤重叠区为工程背景,通过概率积分法提出了管道拉伸应变的理论算法。结合拉伸应变极限建立了沉陷区内管道保护煤柱宽度的预测方法模型,并采用数值分析和工程应用等方法进行对比验证,分析了工作面推进过程中邻近埋地管道的拉伸应变、体积应变和剪切应变等参量的分布演化规律。结果表明:预测方法在确保管道安全的前提下,缩短了管道保护煤柱的宽度,提高了煤炭资源的采出率。随着工作面与管道间水平距离的减小,管道整体的拉伸量、拉伸应变呈指数函数增长;拉伸增量呈现先增大后减小的趋势。工作面向管道靠近过程中,管道轴向上的体积应变分布呈现“V”形、环向上呈现“M”形。管道轴向上的剪切应变分布呈现“W”形、环向上大致呈现“一”形。工作面推进过程中,管道的体积应变和剪切应变均与工作面及管道间的距离呈指数函数关系。管道最易发生破坏的位置处于沉陷区中心和边缘,类似工况需要重点关注。预测方法的应用有利于实现油气煤资源的精准协调开采,而多参量的力学规律研究则有助于对管道的预防性维护和预测结果的修正提供决策支持。To optimize the width of protection coal pillar of shallowly buried pipeline in the coal mining subsidence area,the gas-coal superposition area in Ordos Basin is taken as the engineering background.First,the theoretical algorithm of pipeline tensile strain is proposed using the probability integral method.According to the tensile strain limit,the prediction method model of the width of the pipeline protection coal pillar in the subsidence area is established and verified by comparison using numerical analysis and engineering application.Finally,the distribution and evolution of tensile-,volume-,and shear-strain of adjacent buried pipelines during the advancing process of the panel are analyzed.The results show that the prediction method greatly shortens the width of the pipeline protection coal pillar and improves the recovery rate of coal resources under the premise of ensuring safety.With the decrease in the horizontal distance between the panel and pipeline,the tensile amount and the tensile strain of the whole pipeline grow exponentially.However,the tensile increment shows a trend of increasing first and then decreasing.As the panel gets closer to the pipeline,the volume strain distribution in the axial direction shows a‘V’type and an‘M’in the ring direction.However,the axial shear strain distribution of the pipeline shows a‘W’type and‘-’in the ring.As the panel advanced,the volume strain and shear strain are exponential functions of the horizontal spacing of the panel pipeline.The location where the pipeline is most prone to damage is the center and edge of the subsidence area, and similar working conditions require focused attention. The application of our method isconducive to the accurate and coordinated mining of oil, gas, and coal resources. Meanwhile, the investigation of multi-parametermechanics characteristics is helpful to afford decision support for the correction of prediction results and preventive maintenance.

关 键 词：采矿工程 埋地管道 保护煤柱 拉伸应变 体积应变 剪切应变 

分 类 号：TD823[矿业工程—煤矿开采]