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中文摘要：
为解决查干淖尔一号井回风大巷钢管混凝土支架反底拱失稳破坏问题,分析了支架变形破坏原因。采用结构力学分析方法,研究了拱脚固支约束受均布荷载作用下的钢管混凝土圆弧拱内力大小随矢跨比变化的规律。理论计算结果表明：当圆弧拱矢跨比小于0.25时,在一定的均布荷载作用下,φ194 mm×10 mm钢管混凝土支架反底拱随着矢跨比的增加,拱内最大轴力与最大弯矩下降明显,因此反底拱矢跨比0.25～0.3较为合理。优化方案将反底拱矢跨比为0.15的钢管混凝土支架改为反底拱矢跨比为0.25的支架,其他措施与原有支护方案相同。巷道返修完成2年后无明显变形。
英文摘要：
Aiming to solve the buckling failure problem oi inverted arch oi concrete-filled steel tube supports in main return way of Chagannaoer No. 1 Coal Mine, the reason for deforma- tion and fracture was analyzed. When the clamped restraint of arch springer was affected by even load, the laws that the internal force of circular arch changed with the rise-span ratio were re- searched using structural mechanics analysis method. The theoretical calculation results showed that when the supports was under a certain even load and the rise-span ratio of circular arch was less than 0.25, the maximum axial force and the maximum bending moment in the inverted arch of φ194 mm× 10 mm type concrete-filled steel tube supports decreased obviously with the increas- ing of rise-span ratio, and the reasonable rise-span ratio was 0.25～0.3. The concrete-filled steel tube supports whose rise-span ratio was 0.25 were adopted instead of the former supports, while keeping other supporting scheme unchanged. Practice has proven that there was no obvious de- formation since the roadway completed repair 2 years ago.
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