方鋼約束混凝土拱架補強機制研究及應用
發(fā)布時間：2018-11-08 15:33
【摘要】：方鋼約束混凝土(SQCC)拱架作為復雜條件地下工程中的一種新型支護方式,具備很高的支護強度和后期承載能力,而拱架留設的灌漿孔因局部削弱和應力集中效應而成為拱架的關鍵破壞部位,對拱架整體承載能力具有很大的影響,需對灌漿孔進行補強處理以提高拱架開孔后的整體強度.針對SQCC開孔短柱進行室內試驗及數(shù)值試驗,對比分析短柱變形破壞形態(tài)、荷載位移曲線及極限承載力等力學性能,研究方鋼約束混凝土拱架補強機制;建立約束混凝土強度及經濟指標,綜合對比短柱補強效果.以SQCC150×8短柱為例,留設灌漿孔后短柱極限承載力相比SQCC短柱降低29.9%;側彎鋼板補強(ASS)后短柱的強度指標達148.7%,經濟指標為90.8%,補強效果最好,且補強鋼板長度在180~240 mm范圍內,厚度為8 mm時,側彎鋼板對灌漿孔補強效果最明顯,經濟指標增長率最大.側彎鋼板補強試驗結果在全比尺拱架室內試驗中得到充分驗證,在現(xiàn)場巷道支護應用中效果良好,研究成果為約束混凝土支護設計提供了依據(jù).
[Abstract]:Square steel confined concrete (SQCC) arch frame, as a new support method in complex underground engineering, has high support strength and late bearing capacity. The grouting hole left by arch frame is the key failure part of arch frame because of local weakening and stress concentration effect, which has great influence on the whole bearing capacity of arch frame. It is necessary to strengthen the grouting hole in order to improve the overall strength of arch frame after opening. Laboratory and numerical tests were carried out for SQCC short columns with open holes. The mechanical properties of short columns such as deformation failure mode, load-displacement curve and ultimate bearing capacity were compared and analyzed, and the reinforcement mechanism of square steel confined concrete arch frame was studied. The strength and economic index of confined concrete are established, and the reinforcement effect of short column is compared synthetically. Taking SQCC150 脳 8 short column as an example, the ultimate bearing capacity of short column with grouting hole is 29.9mm lower than that of SQCC short column. The strength index of the short column after (ASS) was 148.7, the economic index was 90.8 and the reinforcement effect was the best. When the length of the reinforcing steel plate was 180 ~ 240 mm and the thickness was 8 mm, the reinforcement effect of the lateral bending steel plate on the grouting hole was the most obvious. The growth rate of economic indicators is the largest. The results of the lateral bending steel plate reinforcement test are fully verified in the indoor test of the full scale arch frame, and the results are good in the application of the field roadway support. The research results provide the basis for the design of confined concrete support.
【作者單位】： 山東大學巖土與結構工程研究中心;中國礦業(yè)大學(北京)深部巖土力學與地下工程國家重點實驗室;濟南大學土木建筑學院;
【基金】：國家自然科學基金資助項目(51674154,51474095) 中國博士后科學基金特別資助項目(2017T100116,2017T100491);中國博士后科學基金面上資助項目(2016M602144,2016M590150) 國家重點研發(fā)計劃專項資助項目(2016YFC0600901) 深部巖土力學與地下工程國家重點實驗室開放基金資助項目(SKLGDUEK1519)
【分類號】：TD353
本文編號：2318901
[Abstract]:Square steel confined concrete (SQCC) arch frame, as a new support method in complex underground engineering, has high support strength and late bearing capacity. The grouting hole left by arch frame is the key failure part of arch frame because of local weakening and stress concentration effect, which has great influence on the whole bearing capacity of arch frame. It is necessary to strengthen the grouting hole in order to improve the overall strength of arch frame after opening. Laboratory and numerical tests were carried out for SQCC short columns with open holes. The mechanical properties of short columns such as deformation failure mode, load-displacement curve and ultimate bearing capacity were compared and analyzed, and the reinforcement mechanism of square steel confined concrete arch frame was studied. The strength and economic index of confined concrete are established, and the reinforcement effect of short column is compared synthetically. Taking SQCC150 脳 8 short column as an example, the ultimate bearing capacity of short column with grouting hole is 29.9mm lower than that of SQCC short column. The strength index of the short column after (ASS) was 148.7, the economic index was 90.8 and the reinforcement effect was the best. When the length of the reinforcing steel plate was 180 ~ 240 mm and the thickness was 8 mm, the reinforcement effect of the lateral bending steel plate on the grouting hole was the most obvious. The growth rate of economic indicators is the largest. The results of the lateral bending steel plate reinforcement test are fully verified in the indoor test of the full scale arch frame, and the results are good in the application of the field roadway support. The research results provide the basis for the design of confined concrete support.
【作者單位】： 山東大學巖土與結構工程研究中心;中國礦業(yè)大學(北京)深部巖土力學與地下工程國家重點實驗室;濟南大學土木建筑學院;
【基金】：國家自然科學基金資助項目(51674154,51474095) 中國博士后科學基金特別資助項目(2017T100116,2017T100491);中國博士后科學基金面上資助項目(2016M602144,2016M590150) 國家重點研發(fā)計劃專項資助項目(2016YFC0600901) 深部巖土力學與地下工程國家重點實驗室開放基金資助項目(SKLGDUEK1519)
【分類號】：TD353
【相似文獻】
相關期刊論文 前2條
1 洪伯潛;約束混凝土結構在井筒支護中的研究與應用[J];煤炭學報;2000年02期
2 李為騰;王琦;王德超;李術才;黃福昌;王洪濤;張紅軍;邵行;;礦用U型約束混凝土拱架軸壓短柱試驗研究及應用[J];采礦與安全工程學報;2014年01期
相關碩士學位論文 前1條
1 李智;深部巷道U型約束混凝土拱架力學性能研究及應用[D];山東大學;2013年
，本文編號：2318901
本文鏈接：http://www.sikaile.net/kejilunwen/kuangye/2318901.html
最近更新
教材專著
