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（1 重慶交通大學土木建筑學院， 重慶 400074；

2 招商局重慶交通科研設計院有限公司， 重慶 400067）

［摘要］為研究后植大直徑錨栓系統(tǒng)的錨固性能，采用非線性數(shù)值分析和試驗對比的方法，對其傳力機理、破壞模式、粘結剪應力和承載能力等問題進行研究。結果表明：后植大直徑錨栓的破壞模式表現(xiàn)為淺層錐體（或雙錐體）和深部粘結破壞的混合模式；其粘結剪應力在承受較小軸向荷載時符合基于彈性理論的雙曲函數(shù)分布，在接近極限荷載時趨于均勻分布，但粘結剪應力明顯隨錨栓直徑的增大而減小。采用CCD修正公式來估算的后植大直徑錨栓的承載能力與試驗結果吻合較好。

［關鍵詞］粘結剪應力； 后植大直徑錨栓； 破壞模式； 承載能力

中圖分類號：TU4769      文獻標識碼：A     文章編號：1002-848X(2015)02-0036-05

Nonlinear numerical analysis and experiment comparison of postinstalled largediameter anchor

Zhao Ningyu1, Chen Zhuo2

（1 School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074, China;

2 China Merchants Chongqing Communications Research & Design Institute Co., Ltd., Chongqing 400067, China）

Abstract:To study the anchorage performance of postinstalled largediameter anchor system, the comparison method of nonlinear numerical analysis and experiment were adopted to study force transfer mechanism, failure mode, bond shear stress and bearing capacity. The results show that the failure form of postinstalled largediameter anchor is a mixed form of shallow cone (or double cone) and deep bond failure. The bond shear stress distribution accords with hyperbolic function based on the elasticity theory under the small axial load. The bond shear stress distributes more evenly when ultimate load is closely reached, but significantly decreases with the increase of the anchor diameter. The bearing capacity of postinstalled largediameter anchor estimated with the CCD modified formula is in good agreement with that of experimental result.

Keywords:bond shear stress;  post\|installed largediameter anchor; failure mode; bearing capacity

*國家自然科學基金項目（5117849），重慶市自然科學基金（cstc2013jcyjA30019）。

作者簡介：趙寧雨，博士，講師，Email：zny2008@163.com。

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