真三轴加卸载应力路径对原煤力学特性及渗透率影响

深部煤炭资源开采过程中,由于地应力和工程扰动的影响,煤岩体常处于三向不等压的真三轴应力状态（σ1＆gt;σ2＆gt;σ3）,而采用常规三轴（σ1＆gt;σ2=σ3）的加载应力路径难以反映煤岩体的实际受力状态。为此,利用自行研制的＂多功能真三轴流固耦合试验系统＂,研究了真三轴加卸载应力路径下原煤力学特性及渗透率演化规律。结果表明：真三轴加卸载应力路径对原煤的变形、强度特性及渗透率演化规律有重要影响。与CCT加载应力路径相比,LUT,LUUT应力路径下原煤峰值强度降低;真三轴加卸载应力路径下原煤八面体剪应力与有效平均正应力之间存在线性关系。真三轴加卸载应力路径下的原煤破坏方式均为拉-剪复合破坏。此...

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Bibliographic Details
Published in煤炭学报 Vol. 43; no. 1; pp. 131 - 136
Main Author 尹光志;刘玉冰;李铭辉;邓博知;刘超;鲁俊
Format Journal Article
LanguageChinese
Published 重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400030 2018
重庆大学 资源及环境科学学院,重庆 400030
Subjects
真三轴加卸载;应力路径;力学特性;渗透率
渗透率
true triaxial stress loading-unloading
stress path
permeability
应力路径
mechanical property
力学特性
真三轴加卸载
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ISSN0253-9993
DOI10.13225/j.cnki.jccs.2017.4500

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Summary:深部煤炭资源开采过程中,由于地应力和工程扰动的影响,煤岩体常处于三向不等压的真三轴应力状态（σ1＆gt;σ2＆gt;σ3）,而采用常规三轴（σ1＆gt;σ2=σ3）的加载应力路径难以反映煤岩体的实际受力状态。为此,利用自行研制的＂多功能真三轴流固耦合试验系统＂,研究了真三轴加卸载应力路径下原煤力学特性及渗透率演化规律。结果表明：真三轴加卸载应力路径对原煤的变形、强度特性及渗透率演化规律有重要影响。与CCT加载应力路径相比,LUT,LUUT应力路径下原煤峰值强度降低;真三轴加卸载应力路径下原煤八面体剪应力与有效平均正应力之间存在线性关系。真三轴加卸载应力路径下的原煤破坏方式均为拉-剪复合破坏。此外,真三轴加卸载应力路径对原煤渗透率演化规律有显著影响。
Bibliography:true triaxial stress loading-unloading; stress path ; mechanical property ; permeability
YIN Guangzhi1,2, LIU Yubing1,2, LI Minghui1,2, DENG Bozhi1,2, LIU Chao1,2, LU Jun1,2 （ 1. State Key Laboratory of Coal Mine Disaster Dynarnies and Control, Chongqing University, Chongqing 400030, China ; 2. College of Resources and Environ- mental Sciences, Chongqing University, Chongqing 400030, China）
During the process of deep coal mining,coal seams are generally under the true triaxial stress state（σ_1σ_2σ_3）,which is influenced by the crustal stress and strong excavation disturbance.The results of conventional traxial stress tests（σ_1σ_2=σ_3） could not correctly describe the in-situ condition.In order to more accurately replicate the stress environment of coal seams,the self-developed new multi-functional true triaxial fluid-solid coupling experiment system was applied to investigate the mechanical properties and permeability evolution of coal under true triaxial loading-unloading stress paths.The results show that the
ISSN:0253-9993
DOI:10.13225/j.cnki.jccs.2017.4500