大断面软岩斜井高强度钢管混凝土支架支护技术

查干淖尔矿主斜井泥岩段围岩变形量大，速度快，巷道支护困难，结合主斜井泥岩段膨胀性软岩的工程地质条件和围岩变形特征，并结合主斜井泥岩段的巷道围岩变形特点，设计了高强度钢管混凝土支架支护方案，其中，巷道断面采用马蹄形，钢管混凝土支架主体钢管选用194 mm×10 mm无缝钢管，充填C40钢纤维混凝土，辅助金属网支护和混凝土喷层支护。通过数值分析可知，主斜井泥岩段开挖后及时施加钢管混凝土支架支护方案，钢管混凝土支架承载能力大，能够提供强大的支护反力，限制巷道围岩向巷道空间的移动，保证巷道围岩稳定和支护结构可靠。通过巷道施工和现场监测分析可知，大断面软岩巷道高强度快速支护方案易于施工，能够维持主斜井泥岩段软岩巷道围岩的稳定。

High strength steel tubular confined concrete supports support technology for large section soft rock inclined shaft

Roadway surrounding rock have the large and fast deformation in main inclined shaft mudstone zone of Chagannaoer Mine，roadway support is difficult.Combined with expansive soft rock engineering geological conditions of main inclined shaft mudstone zone of Chagannaoer Mine and the roadway deformation characteristics of main inclined mudstone zone，high strength steel tubular confined concrete supports (STCCS) support program was designed，in which，the roadway support sections is horseshoe section，the selected main steel tube of STCCS is 194 mm×10 mm seamless steel tube，filled with the C40 steel fibre reinforced concrete，assisted metal mesh supporting and concrete sprayed layer supporting.By numerical analysis，the results show，STCCS support programs should be timely imposed after the excavation of the main inclined shaft mudstone the，the high bearing capacity of STCCS can provide powerful support reaction force and limit roadway surrounding rock to the roadway space and ensure the stability of the surrounding rock and the reliability of supporting structure.Meanwhile，by analysis on on site construction and on site monitoring，STCCS supporting program is easy to construction，and be able to maintain the stability of soft rock roadway surrounding rock of main inclined shaft.