不同含水率条件下含瓦斯煤改进邓肯-张模型  

Improved Duncan-Chang model for coal containing gas under different water content

作　　者：高霞 刘洪 陈港庆 张保勇 吴强 GAO Xia;LIU Hong;CHEN Gangqing;ZHANG Baoyong;WU Qiang(School of Architecture&Civil Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;School of Safety Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学建筑工程学院,黑龙江哈尔滨150022 [2]黑龙江科技大学安全工程学院,黑龙江哈尔滨150022

出　　处：《煤矿安全》2024年第1期22-27,共6页Safety in Coal Mines

基　　金：国家自然科学基金能源与化工领域区域创新发展联合基金资助项目(U21A20111);国家自然科学基金面上资助项目(51974112)。

摘　　要：为建立能够合理反映含瓦斯煤在不同含水率和围压工况下的力学特性模型,首先基于已有的含瓦斯煤常规三轴试验,分析其在不同围压和含水率条件下应力-应变特性;其次结合邓肯-张模型与Janbu公式得到相关的邓肯-张模型参数;然后建立初始弹性模量、破坏应力与各影响因素的拟合公式,构建能表征不同应力水平下含瓦斯煤变形规律的改进邓肯-张模型;最后对修正后的模型进行验证,对模型精度进行评价。结果表明:含水率的增加是引起含瓦斯煤模型参数动态变化的重要原因;提出的改进模型预测曲线与实际的试验曲线具有良好的吻合度,该修正模型可以准确反应不同围压和含水率下含瓦斯煤的应力应变特性。This paper aims to establish a model that can reasonably reflect the mechanical properties of coal containing gas under different water content and confining pressure conditions.Firstly,the stress-strain characteristics of coal containing gas under different water content and confining pressure conditions are analyzed based on triaxial tests.Afterwards,this paper obtains the DuncanChang model parameters by combining the Duncan-Chang model and Janbu formula.Moreover,it establishes the fitting formulas of initial elastic modulus failure stress and various influencing factors,and conducts an improved Duncan-Chang model to characterize the deformation law of coal containing gas under different stress levels.Finally,this paper verifies the improved model and evaluate the accuracy of the mode.The results show that the increase of water content is an important reason for the dynamic change of coal model parameters of coal containing gas.The prediction curve of the improved model is in good agreement with the actual test curve,and the improved model can accurately reflect the stress-strain characteristics of coal containing gas under different confining pressures and water contents.

关 键 词：含瓦斯煤 煤变形规律 邓肯-张模型 Janbu公式 修正模型 煤应力应变特性 

分 类 号：TD315[矿业工程—矿井建设]