杨庄矿软岩巷道锚杆与钢管混凝土支架联合支护技术研究

Study on combined support technology of bolt-mesh-shotcrete and concrete filled steel tubular supports for soft rock roadway in Yangzhuang mine

杨庄矿Ⅲ水平南大巷软岩巷道围岩强度低,黏土矿物含量高,吸水泥化现象严重,巷道围岩变形量大,锚杆失效较为普遍。结合南大巷软岩巷道围岩变形特点,设计了锚杆与钢管混凝土支架联合支护方案。巷道断面采用马蹄形,锚杆为Φ20 mm×L1800 mm的左旋螺纹钢锚杆,钢管混凝土支架主体钢管选用Φ194 mm×L8 mm无缝钢管,灌注C40核心混凝土。结合理论计算可知,设计支护方案的极限承载能力大于南大巷围岩荷载,能够维持巷道围岩的稳定。通过数值分析和现场监测分析可知,巷道围岩变形较小,锚杆和钢管混凝土支架支护作用力均小于其极限荷载,支护结构稳定,所以锚杆与钢管混凝土支架联合支护方案满足了Ⅲ水平南大巷软岩巷道支护的要求。

The sounding rock of Ⅲ-Level South Roadway was significantly affected by geological structure, lower roadway sounding rock strength, higher content of clay minerals, and serious argillization. Combined with deformation characteristics of South Roadway, the combined support of bolt and steel tubular confined concrete support（STCCS） has been designed as follows： roadway section is in horseshoe, with Φ20 mm×L1800 mm L-steel bolt, STCCS constituted by Φ194 mm×L8 mm seamless steel tube and C40 core concrete. Combined with theoretical calculation, the ultimate bearing capacity of the designed support programs is greater than the surrounding rock load of South Roadway, which can maintain the stability of roadway surrounding rock. By numerical analysis and on-site monitoring analysis, the final deformation of roadway sounding rock is small after roadway support scheme has been applied. The support force of bolt and STCCS was less than their limit load. Consequently, roadway support is stable and reliable. So the support programs reached the soft roadway support requirement of Ⅲ-Level South Roadway.