本文選題：鐵路隧道 + 軟弱圍巖　； 參考：《鐵道標(biāo)準(zhǔn)設(shè)計(jì)》2017年12期

【摘要】：鐵路隧道錨桿主要有2種錨固方式:全長(zhǎng)黏結(jié)砂漿和水泥基藥卷,前者施工質(zhì)量較好,可加固桿體周圍巖體,后者施工簡(jiǎn)便,能快速發(fā)揮作用,在現(xiàn)有施工工藝的前提下,為了比較全長(zhǎng)砂漿與水泥基藥卷這2種錨固劑在淺埋軟弱破碎圍巖中的錨固效果,以鄭萬(wàn)高鐵許良隧道為依托工程,采用現(xiàn)場(chǎng)試驗(yàn)的方法對(duì)全長(zhǎng)砂漿錨桿與水泥基藥卷錨桿的錨固效果問(wèn)題進(jìn)行研究,選�、跫�(jí)圍巖段分別設(shè)置全長(zhǎng)砂漿錨桿段50m與水泥基藥卷錨桿段50m進(jìn)行對(duì)比試驗(yàn),且改善了全長(zhǎng)砂漿錨桿注漿工藝,使其注漿密實(shí)度達(dá)到90%。對(duì)比試驗(yàn)的項(xiàng)目有:錨桿軸力、初支鋼架應(yīng)力、噴混凝土應(yīng)力、水平收斂和拱頂沉降�，F(xiàn)場(chǎng)實(shí)測(cè)結(jié)果表明:全長(zhǎng)砂漿段的拱頂沉降和凈空收斂在邊墻錨桿施做后得到了更好的控制,得益于注漿工藝的先進(jìn)性及后期強(qiáng)度的迅速提高,全長(zhǎng)砂漿錨桿受力較大,且使噴射混凝土和鋼架受力較均勻。相比之下,水泥基藥卷段的圍巖變形持續(xù)發(fā)展,受限于錨固質(zhì)量及后期強(qiáng)度的不足,水泥基藥卷錨桿受力較小,導(dǎo)致噴射混凝土和鋼架承擔(dān)較大部分的圍巖壓力,且不均勻。結(jié)論:在當(dāng)前施工工藝和地質(zhì)條件下全長(zhǎng)黏結(jié)砂漿錨桿錨固效果較好。
[Abstract]:There are mainly two kinds of anchoring methods for railway tunnel anchors: Full-length bonded mortar and cement-based coils. The former is of better construction quality and can reinforce the surrounding rock mass of the rod body. The latter is simple in construction and can be used quickly. Under the premise of the existing construction technology,In order to compare the anchoring effect between full-length mortar and cement-based agent in shallow soft and broken surrounding rock, the project is based on the Zhengwan-Wan high-speed railway and Xuliang tunnel.The anchoring effect of full-length mortar anchor rod and cement-based bolting bolt is studied by field test. The full-length mortar bolt section 50 m and cement base grain bolt section 50 m are selected for comparative test.The grouting technology of full-length mortar bolt is improved to make the grouting compactness reach 90%.The comparative test items are: anchor axial force, initial steel frame stress, shotcrete stress, horizontal convergence and dome settlement.The field test results show that the settlement and clearance convergence of the arch roof of the full-length mortar section are better controlled after the side wall bolt is applied, and the full-length mortar bolt has a large force due to the advanced grouting technology and the rapid improvement of the later strength.And the shotcrete and steel frame force is more uniform.In contrast, the continuous development of surrounding rock deformation in cement-based coils is limited by the shortage of anchoring quality and later strength, and the stress of cement-based bolting is small, which leads to a large part of surrounding rock pressure of shotcrete and steel frame, and it is not even.Conclusion: under the current construction technology and geological conditions, the anchoring effect of full-length bonded mortar bolt is better.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51008252)
【分類號(hào)】：U455.4

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