TEST AND NUMERICAL ANALYSIS OF EFFECT OF NOTCHED SILL OF GRAVITY ANCHORAGE ON SOFT ROCK GROUND OF SUSPENSION BRIDGE
LAI Yunjin1，2，WU Changjiang1，2，ZHANG Zixin1，2
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. School of Civil Engineering，Tongji University，Shanghai 200092，China)
Abstract：Based on the rigid calculation model，the formation mechanism of notched sill effect of gravity anchorage is analyzed for suspension bridge on soft rock ground. It reveals that the mode and performance of notched sill effect mainly depend on the centroid position of anchorage. Taking the anchorage project，Ganjiang suspension bridge on Ganjiang River for example，field model test for anchorage is conducted to investigate notched sill effect by studying the stress distribution of each step of notched sill subjected to different cable tension levels. The results from test validate the formation mechanism of notched sill effect. Additionally，three-dimensional numerical simulation is performed to disclose the mechanical characteristics of gravity anchorage with notched sill by means of the fast Lagrangian analysis of continua in 3 dimensions(FLAC3D). The interaction between surrounding soft rock and anchorage both with and without notched sill is studied. It is concluded that the existing notched sill obviously influences the stress distribution on the bottom of foundation，decreases the horizontal displacement，greatly improves the anti-sliding capacity，and changes the instability mode of anchorage. The results from numerical simulation are in good agreement with ones from the field test. Moreover，the analyses of factors of notched sill effect，including the centroid position of anchorage，the height of notched sill and the parameters of interface and surrounding ground，are implemented for structural optimization design. Finally，some principles for designing anchorage structure with notched sill are suggested.
赖允瑾,吴昌将,张子新，. 软岩地基悬索桥重力式锚碇齿坎效应的试验研究与数值分析[J]. 岩石力学与工程学报, 2010, 29(03): 593-602.
LAI Yunjin1，2，WU Changjiang1，2，ZHANG Zixin1，2. TEST AND NUMERICAL ANALYSIS OF EFFECT OF NOTCHED SILL OF GRAVITY ANCHORAGE ON SOFT ROCK GROUND OF SUSPENSION BRIDGE . , 2010, 29(03): 593-602.
