Research of supporting technology of concrete-filled steel tubular composite support at intersection point of soft rock roadways

被引：0
|
作者：
Wang J. [1 ,2 ,3 ]
Lu W. [1 ,4 ]
Xing L. [1 ]
Yang G. [1 ]
Wang Z. [2 ]
机构：
[1] School of Civil Engineering, Shandong Jianzhu University, Jinan
[2] China Railway 14th Bureau Group Co., Ltd., Jinan
[3] Key Laboratory of Structural Reinforcement and Underground Space Engineering, Ministry of Education, Jinan
[4] Shandong Rail Transit Survey and Design Institute Co., Ltd., Jinan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Bending strengthening; Concrete-filled steel tube combined support; Numerical simulation; Rock mechanics; Soft rock roadway intersection;
D O I：
10.13722/j.cnki.jrme.2021.0679
中图分类号：
学科分类号：
摘要：
In order to solve the problem of intersection support of expansive soft rock roadways, taking the intersection point of the main inclined shaft and #2 coal feeder maintenance connecting roadway of Qingshuiying coal mine as the engineering background, and based on the analysis of the geological characteristics and deformation causes of the intersection, the repairing support design based on rectangular concrete-filled steel tube composite support is proposed. Through the numerical simulation analysis of the support bearing capacity, it is found that the flexural bearing capacity of the straight beam section of the composite support is insufficient, which affects the overall support effect. The bending test of the concrete-filled steel tubular straight beam is carried out. The results show that the welding bending round steel in the tensile area of the straight beam can effectively improve the bearing capacity of the concrete-filled steel tubular straight beam. The structure of the rectangular composite support is optimized with φ50 mm bending round steel. The simulation analysis shows that the overall bearing capacity of the optimized composite support is increased by 36%. In engineering practice, the support scheme based on the rectangular concrete-filled steel tube composite support has no obvious deformation in three years of using, and the intersection point of the expansion soft rock roadway remains stable for a long time. The research has an important guiding significance for the intersection point support under similar conditions. © 2022, Science Press. All right reserved.
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页码：573 / 586
页数：13
相关论文
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