本文選題：盾構(gòu)隧道 + 抗拉性能��； 參考：《中國公路學(xué)報(bào)》2017年08期

【摘要】：為了選擇適用于軟土地區(qū)深埋排水盾構(gòu)隧道管片接頭結(jié)構(gòu)形式,針對(duì)新型高承載力盾構(gòu)隧道管片接頭預(yù)埋件結(jié)構(gòu),開展了1∶1結(jié)構(gòu)抗拉性能試驗(yàn),研究管片接頭預(yù)埋件在不同荷載工況下,錨筋的應(yīng)力分布和傳遞、接頭板的變形和位移、螺栓的應(yīng)力分布、管片混凝土裂縫的分布擴(kuò)展情況和結(jié)構(gòu)最終破壞模式等力學(xué)特征。研究結(jié)果表明:錨筋應(yīng)力隨著與預(yù)埋件連接處距離的增加逐步減小,且傳遞曲線均呈現(xiàn)出先陡后緩的趨勢(shì);接頭預(yù)埋件錨板和錨筋的存在,使得接頭的整體剛度得到了增強(qiáng),同時(shí)提高了結(jié)構(gòu)的承載能力;結(jié)構(gòu)最終破壞模式是接頭預(yù)埋件與錨筋的連接位置發(fā)生斷裂破壞,且結(jié)構(gòu)破壞時(shí)預(yù)埋件整體有較大的翹曲變形,因此可以考慮提高預(yù)埋件與錨筋的連接性能并相應(yīng)增加預(yù)埋件的剛度以進(jìn)一步改善結(jié)構(gòu)的整體性能。
[Abstract]:In order to select the segment joint structure suitable for deep buried drainage shield tunnel in soft soil area, a 1:1 tensile performance test was carried out for a new type of high bearing shield tunnel segment joint embedded piece structure. The stress distribution and transfer of anchor bars, the deformation and displacement of joint plates, the stress distribution of bolts, the distribution and propagation of cracks in segment concrete, and the ultimate failure mode of segment joints are studied under different load conditions. The results show that the stress of anchor bar decreases gradually with the increase of the distance between the anchor bar and the embedded member, and the transfer curves show a tendency of steepness first and then slow down, and the overall stiffness of the joint is enhanced by the existence of anchor plate and anchor bar. At the same time, the bearing capacity of the structure is improved, and the ultimate failure mode of the structure is that the connection position of the joint embedded piece and the anchor bar is broken, and the whole embedded piece has a large warping deformation when the structure is destroyed. Therefore, it can be considered to improve the connection performance of the embedded parts and anchor bars and increase the stiffness of the embedded parts accordingly to further improve the overall performance of the structure.
【作者單位】： 同濟(jì)大學(xué)土木工程學(xué)院;同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室;上海市政工程設(shè)計(jì)研究總院(集團(tuán))有限公司;
【基金】：上海市科學(xué)技術(shù)委員會(huì)科研計(jì)劃項(xiàng)目(16DZ1202200)
【分類號(hào)】：U455.43

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本文編號(hào)：2018979