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沉管隧道節(jié)段接頭剪力鍵破壞狀態(tài)與機(jī)理研究*
胡指南,謝永利,來弘鵬,晏長(zhǎng)根
摘 要
(長(zhǎng)安大學(xué)公路學(xué)院,西安 710064)
 
[摘要]為研究港珠澳大橋沉管隧道節(jié)段接頭剪力鍵破壞狀態(tài)與機(jī)理,采用ANSYS軟件對(duì)沉管節(jié)段在縱、橫向地基不均勻沉降與不均勻回淤荷載作用下的彎曲與扭轉(zhuǎn)工況進(jìn)行三維數(shù)值模擬。同時(shí),以長(zhǎng)安大學(xué)路基沉降試驗(yàn)平臺(tái)為基礎(chǔ),對(duì)沉管隧道的3個(gè)節(jié)段進(jìn)行了縮尺比為1∶4.69的大比尺沉管節(jié)段模型試驗(yàn)。對(duì)比數(shù)值模擬與試驗(yàn)得到的剪力鍵剪力結(jié)果得出,彎曲與扭轉(zhuǎn)工況中豎向剪力鍵起主要作用,彎曲工況中剪力鍵受力狀態(tài)為彎剪,扭轉(zhuǎn)工況中剪力鍵存在“剪滯效應(yīng)”。通過對(duì)豎向剪力鍵應(yīng)力矢量的分析,并結(jié)合剪力鍵的破壞特征與破壞過程,提出剪力鍵的破壞機(jī)理。最后,對(duì)剪力鍵的設(shè)計(jì)提出了相應(yīng)優(yōu)化建議。
[關(guān)鍵詞]港珠澳大橋; 沉管隧道; 節(jié)段接頭; 剪力鍵; 破壞狀態(tài)
中圖分類號(hào):U459.5      文獻(xiàn)標(biāo)識(shí)碼:A      文章編號(hào):1002-848X(2015)01-0077-05
 
Research on failure state and mechanism of shear key of segmental joint in immersed tunnel
Hu Zhinan, Xie Yongli, Lai Hongpeng, Yan Changgen
 (College of Highway, Chang’an University, Xi’an 710064, China)
 
Abstract: In order to research failure states and mechanisms of shear keys of segmental joints in immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge, the three dimensional numerical simulation by ANSYS software was adopted to simulate working conditions of bending and twisting of immersed tunnel segments caused by longitudinal and transverse uneven foundation settlements as well as uneven back-filling loading. At the same time, large-scale immersed tunnel segmental model tests with scale ratio of 1∶4.69 was carried out on three immersed tunnel segments based on a subgrade settlement experimental platform of Chang’an University. Comparing shearing force results of shear keys from numerical models and tests, it can be seen that vertical shear keys play main role under bending and twisting working conditions. Shearing status of shear keys under bending working condition is bending and shearing, while shearing lag effect exists in twisting working condition. Furthermore, failure mechanisms of shear keys were obtained through analyzing vector diagrams, failure characteristics and failure process of vertical shear keys. Based on this, structural optimizing measures on shear key design were put forward.
Keywords: Hong Kong-Zhuhai-Macao Bridge; immersed tunnel; segmental joint; shear key; failure state
*國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAG07B01)。
作者簡(jiǎn)介:胡指南,博士研究生,Email: huzhinan001@163.com。
 
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