【摘要】 热处理高强钢筋具有高强度、延展性能优越、强屈比高、焊接与冷弯性能优越等诸多优点,能够有效降低工程中钢筋的用量、提高工程质量,在国内外许多工程中得到了成功的应用,但是在隧道工程中的应用刚刚起步。结合铁路、公路隧道工程建设,开展热处理高强钢筋格栅应用的现场试验研究,对比分析高强钢筋格栅与原设计的I20b型钢拱架的支护性能。试验结果表明,格栅拱架试验段相比I20b型钢拱架试验段的沉降收敛减少约7%～30%,围岩压力相差不多,但格栅拱架应力略高。由于格栅与混凝土的粘结性更好,格栅+喷混凝土的最终承载能力大于型钢+喷混凝土,且格栅拱架的钢材用量比I20b型钢拱架的用钢量节约36%,具有显著的经济和社会效益。更多还原

【Abstract】 The heat treated-high strength steel bar have many advantages,such as high strength,good ductility,high strength ratio,good welding and cold bending performance,etc. It could effectively reduce the amount of steel bars and improve the project quality,and was successfully applied in civil engineering at home and abroad. However,the application of heat treated-high strength steel bar has limited study in the tunnel engineering. Based on the railway and highway tunnel construction,field tests of heat treatment high-strength lattice girders was carried out. By comparing the results,the supporting performance of high-strength lattice girders and I20b steel was analyzed. The result showed that settlement and convergence between high-strength lattice girders test section and I20b steel was reduced 7% ～ 30%,and the surrounding rock pressure was close. But the steel stress of high-strength lattice girders was higher than I20b steel. Because of better combination between lattice girders and shotcrete,high-strength lattice girders ultimate bearing capacity was bigger than I20b steel,and steel material consumption of high-strength lattice girders was about 36% less than I20b steel. So high-strength lattice girders had good social and economic efficiency.更多还原