本文選題：盾構(gòu)隧道　切入點(diǎn)：接頭性能　出處：《中國(guó)公路學(xué)報(bào)》2017年08期 　論文類型：期刊論文

【摘要】：為了研究大斷面矩形盾構(gòu)隧道管片接頭結(jié)構(gòu)的力學(xué)性能及其極限承載能力和極限破壞狀態(tài),進(jìn)行了該管片接頭的極限抗彎承載力試驗(yàn)。試驗(yàn)在同濟(jì)大學(xué)自主研發(fā)的盾構(gòu)隧道管片接頭試驗(yàn)加載系統(tǒng)中進(jìn)行,采用Datataker數(shù)據(jù)采集系統(tǒng)記錄了接頭試件在荷載作用下的力學(xué)性能變化過程,同時(shí)采集并記錄了該接頭的破壞過程和最終破壞形態(tài)。通過分析管片接縫張角、接頭處撓度以及雙排螺栓應(yīng)力隨接頭處彎矩荷載的變化,對(duì)該管片接頭結(jié)構(gòu)力學(xué)性能變化及破壞全過程進(jìn)行研究,并將其分為3個(gè)階段:彈性變化階段(彎矩小于450kN·m)、塑性發(fā)展階段(彎矩為450~800kN·m)、屈服破壞階段(彎矩大于800kN·m)。試驗(yàn)結(jié)果表明:正彎矩荷載下該斷面形式的大斷面矩形盾構(gòu)隧道管片接頭屈服彎矩為800kN·m,極限抗彎承載力為884kN·m,均遠(yuǎn)大于該管片接頭設(shè)計(jì)荷載(534kN·m),意味著試驗(yàn)的大斷面矩形盾構(gòu)隧道管片接頭可滿足抗彎設(shè)計(jì)的要求,并為類似工程提供參考。管片接頭試件的最終破壞形態(tài)表明,除了傳統(tǒng)圓形盾構(gòu)隧道管片接頭試驗(yàn)中常見的接縫混凝土受壓屈服破壞、接頭螺栓受拉屈服破壞以外,所研究的大斷面矩形盾構(gòu)隧道縱縫接頭出現(xiàn)了新的破壞形態(tài),即接頭盒斷裂和錨固失效。
[Abstract]:In order to study the mechanical properties, ultimate bearing capacity and ultimate failure state of segmental joint structure of large section rectangular shield tunnel, The ultimate bending bearing capacity of the segment joint was tested. The test was carried out in the shield tunnel segment joint test loading system independently developed by Tongji University. Datataker data acquisition system was used to record the change of mechanical properties of the joint specimen under load, and the failure process and final failure form of the joint were collected and recorded. The deflection at the joint and the stress of the double row bolts vary with the bending moment load at the joint. The mechanical properties of the segment joint and the whole process of failure are studied. It can be divided into three stages: elastic change stage (moment less than 450kN MN), plastic development stage (moment is 450~800kN mJ, yield failure stage (moment is greater than 800kN mu). The test results show that the rectangular shield with large cross section under positive moment load is a large section of rectangular shield. The yield moment of tunnel segment joint is 800kN m, and the ultimate flexural capacity is 884kN m, which is much larger than the design load of this segment joint (534kN / m), which means that the large section rectangular shield tunnel segment joint can meet the requirements of bending design. The ultimate failure pattern of segment joint specimen shows that, except for the common joint joint test of circular shield tunnel, joint concrete is subjected to compressive yield failure and joint bolt is subjected to tensile yield failure. The longitudinal joint of the large section rectangular shield tunnel has appeared a new failure mode, that is, the fracture of joint box and the failure of Anchorage.
【作者單位】： 同濟(jì)大學(xué)地下建筑與工程系;同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;上海市城市建設(shè)設(shè)計(jì)研究總院(集團(tuán))有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51378388) 上海市科委科研計(jì)劃項(xiàng)目(15XD1522500,16DZ1201701)
【分類號(hào)】：U455.43
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本文編號(hào)：1649142