高地应力-化学侵蚀耦合作用下炭质板岩蠕变试验及非线性蠕变损伤模型  

High ground stress−chemical erosion coupling effect on carbonaceous shale creep experiment and nonlinear creep damage model

作　　者：陈秋南[1] 贺泳超 陈湘生 谢云鹏[4] 黄小城 CHEN Qiunan;HE Yongchao;CHEN Xiangsheng;XIE Yunpeng;HUANG Xiaocheng(Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;College of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [3]深圳大学土木与交通工程学院,广东深圳518060 [4]山东大学岩土与工程结构研究中心,山东济南250061

出　　处：《中南大学学报（自然科学版）》2024年第2期789-798,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52078211);湖南省交通运输厅科技进步与创新项目(202308)。

摘　　要：为克服高程障碍并降低施工风险,可采用长大隧道穿越崇山峻岭,但这些隧道往往处于深埋高地应力环境,并受到化学侵蚀影响。为了解决此问题,以丽江—香格里拉炭质板岩大变形隧道为研究对象,采用室内试验和理论推导,研究深埋炭质板岩隧道受化学侵蚀作用下的围岩变形特性。在Poyting-Thomson体蠕变体的基础上,根据模型元件的力学特性,叠加了损伤元件、化学损伤元件和非线性元件,提出高地应力-化学侵蚀耦合作用下炭质板岩非线性蠕变损伤本构关系。研究结果表明:1)炭质板岩试样受化学侵蚀影响显著,侵蚀90 d试样所产生的轴向蠕变应变为侵蚀0 d试样的2.02倍,侵蚀60 d试样所产生的径向蠕变为侵蚀0 d试样的1.85倍;2)受侵蚀的炭质板岩试样在三轴压缩状态下破裂以斜向贯通裂隙为主,并产生一定的滑移错动裂隙,且沿轴线的拉伸劈裂破坏受围压作用抑制明显,未产生竖向贯通裂隙。In order to overcome the elevation obstacles and reduce the construction risks,long tunnels can be used to cross the lofty mountains,but these tunnels are often in deep-buried high-geostress environments and affected by chemical erosion.In order to solve these problems,a large deformation tunnel in charcoal slate of the Lijiang—Shangri-La was taken as the research object,and the deformation characteristics of the surrounding rock in deeply buried charcoal slate tunnels subjected to chemical erosion were investigated by using indoor experiments and theoretical derivation.On the basis of the Poyting-Thomson body creep body,according to the mechanical properties of the model elements,damage elements,chemical damage elements,and nonlinear elements were superimposed,and the proposal of the high geostatic stress-chemical erosion coupling effect was made.The results show that:1)The carbonaceous slate specimen is significantly affected by chemical erosion,and the axial creep strain produced by the specimen with 90 d of erosion is 2.02 times that of the specimen with 0 d of erosion,and the radial creep strain produced by the specimen with 60 d of erosion is 1.85 times that of the specimen with 0 d of erosion;2)Eroded carbonaceous slate specimens ruptured in triaxial compression are dominated by diagonal through fissures with some slip misalignment fissures,the tensile splitting damage along the axes is suppressed significantly by peripheral compression,and no vertical through fissures are produced.

关 键 词：炭质板岩隧道 高地应力 化学侵蚀 耦合作用 蠕变试验 非线性蠕变损伤本构模型 

分 类 号：TU45[建筑科学—岩土工程]