基于Hoek-Brown准则的基岩段井壁设计优化

DESIGN OPTIMIZATION OF SHAFT LINING IN BEDROCK SECTION BASED ON HOEK-BROWN CRITERION

针对某煤矿副井的井筒直径较大,工程地质条件较差,井筒施工环境和井壁受力复杂等情况,通过收敛约束法和Hoek-Brown强度准则估算岩体力学参数,验算副井基岩段的井壁结构强度,进而对基岩段的井壁结构设计方案进行优化,为确保井筒建设的安全性和快速性,从而将井壁混凝土强度等级从C30提高至C40。

In view of the large shaft diameter,poor engineering geological conditions,complex shaft construction environment,and shaft wall stress of an auxiliary shaft in a coal mine,the mechanical parameters of rock mass are estimated through convergence constraint method and Hoek Brown strength criterion.The structural strength of the shaft wall in the bedrock section of the auxiliary shaft is checked,and the structural design scheme of the shaft wall in the bedrock section is optimized to ensure the safety and rapidity of the shaft construction,thus,the strength grade of shaft wall concrete is considered to increase from C30 to C40.