摘要
为探寻沿空留巷厚层复合顶板的传递承载机制,结合复合顶板松软易变形、容易造成巷旁充填区顶板抽冒和巷内顶板切落的特征,建立巷旁支撑系统力学模型,得出顶板、墙体和底板的系统刚度算式,阐明复合顶板吸收变形的特征。直接顶、墙体和直接底组成巷旁支护系统共同承担顶板压力,系统刚度随着顶底板刚度的增加而增大,初始刚度越小增大的效果越明显;厚层复合顶板具有良好的吸收变形能力,利于缓解巷旁墙体的压力;提出可有效提高巷旁支护系统刚度、增强复合顶板传递承载能力的整体化加固技术。研究成果成功应用于10 m厚复合顶板条件。
In order to explore transfer bearing mechanism of thick composite roof in gob-side entry retaining,combining with characteristics that the composite roof is soft and proteiform and which leads to roof caving in gob-side backfill zone and roof cutting inside entry,systematic stiffness equation of roof,wall and floor is acquired through establishing mechanical model of supporting system beside entry,absorbing deformation characteristics are finally expounded.Roadway-side support system consists of direct roof,wall and direct floor,which bears the roof pressure integrally.The systematic stiffness is increasing with the rising of the stiffness of roof and floor;the rising effect is apparent when the original stiffness is low,in particular.The thick composite roof has a good performance on absorbing deformation,which is beneficial to relieving the pressure of roadway-side wall.For enhancing systematic stiffness of god-side support and strengthening transfer bearing ability of thick composite roof,the integral reinforcing technology is put forward.The research results have been applied to the condition of 10 meters composite roof successfully.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2013年第S1期318-323,共6页
Rock and Soil Mechanics
基金
高等学校博士学科点专项科研基金资助(No.20110095110013)
江苏省普通高校研究生科研创新计划资助(No.CX10B_147Z)
关键词
复合顶板
传递承载
系统刚度
吸收变形
沿空留巷
composite roof
transfer bearing
systematic stiffness
deformation absorption
gob-side entry retaining
