【摘要】：方鋼約束混凝土(SQCC)拱架作為復(fù)雜條件地下工程中的一種新型支護(hù)方式,具備很高的支護(hù)強(qiáng)度和后期承載能力,而拱架留設(shè)的灌漿孔因局部削弱和應(yīng)力集中效應(yīng)而成為拱架的關(guān)鍵破壞部位,對(duì)拱架整體承載能力具有很大的影響,需對(duì)灌漿孔進(jìn)行補(bǔ)強(qiáng)處理以提高拱架開(kāi)孔后的整體強(qiáng)度.針對(duì)SQCC開(kāi)孔短柱進(jìn)行室內(nèi)試驗(yàn)及數(shù)值試驗(yàn),對(duì)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(xué)性能,研究方鋼約束混凝土拱架補(bǔ)強(qiáng)機(jī)制;建立約束混凝土強(qiáng)度及經(jīng)濟(jì)指標(biāo),綜合對(duì)比短柱補(bǔ)強(qiáng)效果.以SQCC150×8短柱為例,留設(shè)灌漿孔后短柱極限承載力相比SQCC短柱降低29.9%;側(cè)彎鋼板補(bǔ)強(qiáng)(ASS)后短柱的強(qiáng)度指標(biāo)達(dá)148.7%,經(jīng)濟(jì)指標(biāo)為90.8%,補(bǔ)強(qiáng)效果最好,且補(bǔ)強(qiáng)鋼板長(zhǎng)度在180~240 mm范圍內(nèi),厚度為8 mm時(shí),側(cè)彎鋼板對(duì)灌漿孔補(bǔ)強(qiáng)效果最明顯,經(jīng)濟(jì)指標(biāo)增長(zhǎng)率最大.側(cè)彎鋼板補(bǔ)強(qiáng)試驗(yàn)結(jié)果在全比尺拱架室內(nèi)試驗(yàn)中得到充分驗(yàn)證,在現(xiàn)場(chǎng)巷道支護(hù)應(yīng)用中效果良好,研究成果為約束混凝土支護(hù)設(shè)計(jì)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(xué)巖土與結(jié)構(gòu)工程研究中心;中國(guó)礦業(yè)大學(xué)(北京)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;濟(jì)南大學(xué)土木建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51674154,51474095) 中國(guó)博士后科學(xué)基金特別資助項(xiàng)目(2017T100116,2017T100491);中國(guó)博士后科學(xué)基金面上資助項(xiàng)目(2016M602144,2016M590150) 國(guó)家重點(diǎn)研發(fā)計(jì)劃專項(xiàng)資助項(xiàng)目(2016YFC0600901) 深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金資助項(xiàng)目(SKLGDUEK1519)
【分類號(hào)】：TD353

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