深部不同断面巷道分区破裂形态与围岩结构控制  

Patterns of zonal disintegration and structural control of surrounding rock of deep roadway with different sections

作　　者：许磊[1,2] 郭帅 Davide Elmo 刘洪林 洪紫杰 肖同强[5] XU Lei;GUO Shuai;Davide Elmo;LIU Honglin;HONG Zijie;XIAO Tongqiang(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Henan Key Laboratory of Underground Engineering and Disaster Prevention(Henan Polytechnic University),Jiaozuo 454000,China;The Norman B.Keevil Institute of Mining Engineering,University of British Columbia,Vancouver V6T 1Z4,Canada;College of Geology and Mines Engineering,Xinjiang University,Urumqi 830046,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南省地下工程与灾变防控重点实验室(河南理工大学),河南焦作454000 [3]英属哥伦比亚大学NBK矿业工程学院,温哥华V6T 1Z4 [4]新疆大学地质与矿业工程学院,新疆乌鲁木齐830046 [5]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《岩土工程学报》2023年第4期720-729,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51964043,52074101);河南省地下工程与灾变防控重点实验室(河南理工大学)自主课题;河南省教育厅2023国际合作培育项目。

摘　　要：采用理论分析、现场实测、模拟分析的方法,研究了各向等压条件下等效开挖矩形、直墙半圆拱和圆形断面分区破裂形态及围岩稳定结构。结论:3个断面分区破裂形态不同,矩形断面分区破裂呈“■”状分布,直墙半圆拱断面分区破裂呈多层的“■”状分布,圆形断面分区破裂呈“花瓣”状分布;三个断面位移特征相似,位移等值线浅部呈正立的“鸡蛋壳”形,深部呈“碗”形;支承压力在主破裂面处降低,在最外层主破裂面头部集中,在破裂面之间完整岩层处升高,呈分区集中,“波谷—波峰—波谷”震荡增高的特征向外传播;理想正方形破裂面弦长有an+1=2(1/2)an(n=1,2,3,4)关系;浅部围岩分区破裂形成后,相当于深部围岩的伪开挖,3个断面均存在多层“■”形围岩承载结构。巷道稳定原理就是促进多层承载结构相互依存,共同承载。具体措施:加密、加粗、加长锚杆(索)支护结构,建立浅部与深部多层承载结构相互联系,在浅部形成稳定锚固体促进深部围岩稳定,主破裂面精准注浆修复围岩破裂面和限制主破裂面滑移。The patterns of zonal disintegration and stability structures of surrounding rock of the equivalent excavation rectangular,straight wall semi-circle arch and circular sections under isotropic isostatic conditions are studied through the theoretical analysis,field measurement and simulation analysis.The conclusions are drawn as follows:the patterns of zonal disintegration of three sections are different.The zonal disintegration of rectangular section exhibits“■”distribution;and the straight wall semicircle arch and circular section show“■”and“petal”shaped distributions.The displacement characteristics of three sections are similar;the shallow part of the displacement isoline has an upright"egg shell"shape and the deep part has a“bowl”shape.The abutment pressure decreases at the main fracture surface,concentrates at the head of the main fracture surface in the outermost layer,and increases at the complete rock layer between fracture surfaces,showing a zoning concentration.The abutment pressure propagates outward with the characteristics of"wave trough-wave crest-wave trough"that gradually increases.The chord length of an ideal square fracture surface has a relationship of+12 n n a=a(n=1,2,3,4).After the zonal disintegration of the shallow surrounding rock is formed,it is equivalent to the pseudo-excavation of deep surrounding rock.Three sections have the bearing structures of multi-layer“■”shaped surrounding rock.The principle of roadway stability is to promote the interdependence and co-bearing of multi-layer bearing structures.The specific measures include encrypted,thickened,lengthened bolt(cable)supporting structures.The relationship between shallow and deep multi-layer bearing structures is established.The stable anchor solid is formed in the shallow part to promote the stability of the surrounding rock in the deep part.The precise grouting should be employed to repair the main fracture surface of the surrounding rock and to limit the slip of the main fracture surface.

关 键 词：分区破裂 围岩结构 深部巷道 破裂形态 

分 类 号：TU433[建筑科学—岩土工程]