新型单层冻结井壁水平极限承载特性试验研究  

EXPERIMENTAL STUDY OF HORIZONTAL ULTIMATE LOADING CAPACITY OF NEW TYPE MONOLAYER FREEZING SHAFT LINING

作　　者：陈晓祥[1] 杨维好[2] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《岩石力学与工程学报》2013年第S2期3740-3748,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技支撑计划资助项目(2006BAB16B01);国家自然科学基金资助项目(41171065);河南省教育厅自然科学研究计划项目(2009B560004)

摘　　要：针对采用双层复合井壁的井筒掘进断面有效利用率大幅降低的情况,提出一种新型单层冻结井壁结构,为获得该种井壁结构的水平承载特性,采用相似模拟试验方法,研究3个井壁的水平极限承载特性和变形破坏特征,研究结果表明,井壁竖向、环向应变值、竖向位移与竖压一致性较好,不会出现机械滞后的问题;井壁所受竖压可视为均匀竖压;泊松比与混凝土强度无关,弹性模量与混凝土强度相关;竖向极大正位移与加载围压之前的最大竖向荷载呈正比关系;竖向极大位移与水平极值位移/水平极限荷载基本呈正比关系;在忽略竖压影响的情况下,径向位移与水平应力基本上呈正比关系;井壁破坏时内侧压应变远大于井壁外侧,内侧总压应变一般为-2 000^-2 500με,有时达到并超过-3 000με;新型单层井壁极限承载力高于普通混凝土井壁。研究结果对完善新型单层井壁设计理论以及指导新型单层井壁快速、科学施工等均具有重要意义。Aiming at the situation that the effective excavated section utilization reduced sharply in composite shaft lining,a new type monolayer shaft lining structure was put forward. To obtain horizontal bearing capacity of this kind of shaft lining,similar simulation tests were used to study horizontal ultimate bearing capacity and deformable character on three shafts. The results indicate that:vertical strain and circumferential strain as well as vertical displacement of shaft lining better consistent with vertical stress,no mechanical hysteresis appeared;vertical pressure loading on shaft wall can be considered as uniform;the concrete strength is independent of poisson ratio,but relate to the elasticity coefficient;vertical maximum positive displacement and maximum vertical load before confining pressure being loaded related positively;vertical maximum positive displacement is almost proportional to the ratio of horizontal displacement and most horizontal load positively;Ignoring vertical pressure,radial displacement is proportional to the level stress positively;the inside compression strain is much larger than the sidewall lateral when shaft lining is crushed,the total inside compression strain is between-2 000 and -2 500 με,sometimes reaches -3 000 με,even exceeding;ultimate bearing capacity of new monolayer freezing shaft lining is higher than common concrete. Researching results have great significance in perfecting design theories of the new type of monolayer shaft lining and guiding it constructing fast and scientifically.

关 键 词：采矿工程 冻结井壁 极限承载特性 试验研究 

分 类 号：TD265.3[矿业工程—矿井建设]