钢管混凝土支架注浆孔补强技术数值模拟分析

Numerical Simulation on Reinforcement of Grouting Hole of Short Column of Concrete-filled Steel Tube Suuport

钢管混凝土支架在井下注入混凝土时要留设注浆孔,为了弥补注浆孔周边钢管刚度,实施了加强板、插入注浆短管和封孔塞3项补强措施。采用ABAQUS有限元软件分析在弹性加载条件下钢管的应力分布特征,注浆孔导致孔口两侧的压应力集中系数最大,为8.45;采用3项补强措施后,钢管注浆孔附近的压应力集中程度明显降低。通过数值分析并优化出补强措施:加强板为500mm×300 mm×10 mm,注浆短管为直径133 mm×8 mm,封孔塞直径为116 mm×40 mm。优化的补强措施有效降低了应力集中程度和补强措施的用钢量。

Grouting holes need to be reserved when grouting in the well in the conturction of concret-filled steel tube supports（CFSTS）.Reinforcement plate,short grouting tube and sealing plug are needed so as to ensure the rigidity of the steel tube around the grouting hole of CFSTS.The characteristics of the distribution of stresses on the steel tube under elastic loading conditions are analyzed by means of ABAQUS.The compressive stress concentration coefficient on both sides of the grouting hole is the largest,reaching 8.45.The compressive stress concentration degree around the grouting hole decreases dramatically when reinforcement measures are taken.Different reinforcement measures are simulated and the following optimized reinforcement measures are proposed： the dimension of the reinforcement plate should be 500mm×300mm×10mm,that of the short grouting duct should be 133mm×8mm and that of the sealing plug should be 116mm×40mm.With the optimized reinforcement measures,the stress concentration degree and the steel consumption are effectively reduced.