工程科学学报2017，Vol.39Issue(8)：1141-1151,11.DOI:10.13374/j.issn2095-9389.2017.08.002
方钢约束混凝土拱架补强机制研究及应用
Study and application of strengthening mechanism of square confined concrete arch with grouting holes
摘要
Abstract
ABSTRACT The new support way-square confined concrete (SQCC) arch in complex-condition underground engineering applica-tions has higher supporting strength and post-bearing capacity. The grouting holes become key parts of the arch with local weakening and stress concentration effects and greatly influence the bearing capacity of the whole arch. As such, it is necessary to reinforce this area. In laboratory tests and numerical experiments on SQCC test specimens with grouting holes, the strengthening mechanism was investigated by comparative analysis of the mechanical properties, including the deformation and failure patterns, load displacement curve, and ultimate bearing capacity. To compare the different reinforcing effects, strength and economic indexes were established. The results show the ultimate bearing capacity of a short column with grouting holes to be reduced by 29. 9% compared to the SQCC short column. In a case study of the SQCC150 × 8 short column, the reinforcement method using two-angle steel exhibited better rein-forcing effect, improving both the strength and economic indexes of short columns up to 148. 7% and 90. 8% , respectively. When the length of the reinforcement plate ranges from 180- 240 mm and the plate thickness is 8 mm, the reinforcement effect is best, and the economic index also reaches its peak value. Moreover, the angle steel strengthening (ASS) experiments was conducted in a full-scale laboratory test. The application of SQCC arches in roadway supports has a good effect, and these research results provide a basis for the design of confined concrete support.关键词
方钢约束混凝土/灌浆孔/补强机制/全比尺力学试验/现场应用Key words
square confined concrete/grouting holes/strengthening mechanism/full-scale mechanical test/field application分类
矿业与冶金引用本文复制引用
王琦,于恒昌,江贝,章冲,李术才,何满潮,孙会彬,秦乾..方钢约束混凝土拱架补强机制研究及应用[J].工程科学学报,2017,39(8):1141-1151,11.基金项目
国家自然科学基金资助项目(51674154,51474095) （51674154,51474095）
中国博士后科学基金特别资助项目(2017T100116,2017T100491) （2017T100116,2017T100491）
中国博士后科学基金面上资助项目(2016M602144,2016M590150) （2016M602144,2016M590150）
国家重点研发计划专项资助项目(2016YFC0600901) （2016YFC0600901）
深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1519) （SKLGDUEK1519）
