桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2009年
z2期
67-71
,共5页
西堠门大桥%悬索桥%锚碇%岩基%摩阻系数%承载能力%原位试验
西堠門大橋%懸索橋%錨碇%巖基%摩阻繫數%承載能力%原位試驗
서후문대교%현색교%묘정%암기%마조계수%승재능력%원위시험
Xihoumen Bridge%suspension bridge%anchorage%rock foundation%frictional resistance coefficient%bearing capacity%in-situ test
西堠门大桥是舟山大陆连岛工程的第4座桥,为非对称结构形式的悬索桥.该桥南北锚碇均采用重力式锚,锚碇处地质结构复杂.对南锚碇基坑底面岩基进行承载能力原位试验及摩阻系数原位试验.试验结果表明,锚碇基坑岩基承载力满足设计取值要求.在各级设计正应力下,混凝土试件与岩基接触面的剪切破坏不是发生在两者的胶结面,而是试件区域的岩基首先被剪坏,地基岩石全部碎裂,试验确定的摩阻系数允许值为0.61.
西堠門大橋是舟山大陸連島工程的第4座橋,為非對稱結構形式的懸索橋.該橋南北錨碇均採用重力式錨,錨碇處地質結構複雜.對南錨碇基坑底麵巖基進行承載能力原位試驗及摩阻繫數原位試驗.試驗結果錶明,錨碇基坑巖基承載力滿足設計取值要求.在各級設計正應力下,混凝土試件與巖基接觸麵的剪切破壞不是髮生在兩者的膠結麵,而是試件區域的巖基首先被剪壞,地基巖石全部碎裂,試驗確定的摩阻繫數允許值為0.61.
서후문대교시주산대륙련도공정적제4좌교,위비대칭결구형식적현색교.해교남북묘정균채용중력식묘,묘정처지질결구복잡.대남묘정기갱저면암기진행승재능력원위시험급마조계수원위시험.시험결과표명,묘정기갱암기승재력만족설계취치요구.재각급설계정응력하,혼응토시건여암기접촉면적전절파배불시발생재량자적효결면,이시시건구역적암기수선피전배,지기암석전부쇄렬,시험학정적마조계수윤허치위0.61.
Xihoumen Bridge is the fourth bridge of the Zhoushan Mainland and Islands Link Project and is a suspension bridge of asymmetric structure. The south and north anchorages of the Bridge are all of gravity type anchorages and the geologic structures at the sites where the anchorages are located are complicated. The in-situ tests for the bearing capacity and frictional resistance coefficient of the rock foundation at the bottom of the south anchorage foundation pit were made. The results of the tests indicate that the bearing capacity of the rock foundation meets the values selected for the design. At different levels of the designed normal stress, the shear failure at the contact between the tested concrete slab and the rock foundation does not occur between the binding surface of the slab and rock, instead, the rock in the range of the tested slab fails first due to the shear force, the rock completely crashes and the allowable value of the frictional resistance coefficient determined by the tests is 0. 61.
