强震崩塌岩体冲击桥墩动力响应研究

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Abstract In the high earthquake region of intensity VIII，dangerous rock mass slope of Xichongte bridge pier #16 at YK136＋097 along Ya?an—Lugu highway is selected as studying objects. The geology-dynamics model of dangerous rock bodies is constructed from steep structural plane tilting to the outside slope and weathering- unloading fracture. Monitoring points are placed at important places of slope body and bridge pier. Using the numerical analysis method of discontinuous deformation，the instability model，failure scale，motion trajectory of dangerous rock masses and their impact dynamic response characteristics on bridge pier are simulated. Evolution process is presented as follows：Under intense earthquake，horizontal earthquake force causes enlargement effect，which results in earthquake collapse and ejection of the rock masses at salient position at first. Next，shattering-sliding and disintegrating of the rock masses happens along unloading tension fracture surfaces in the middle of slope. At last，the whole landslide body slumps along controlling structural plane and impacts bridge pier. Statistical analysis of displacement and deformation feature of all monitoring points at slope body and bridge pier shows that the displacement from all monitoring points is positively correlated with earthquake rhythm. Under the influence of the impacting of instability rock and the pushing of accumulation rock，the deformation and permanent displacement of beam and the top of pier are larger than that at other positions，which is the same as phenomenon of bridge failure during “5•12” Wenchuan earthquake. Based on the quantitative analysis of deformation of slope and pier，according to the collapse features induced by intense earthquake，prevention and treatment measurement are put forward for the dangerous rock mass of bridge slope.

Key words： engineering geology dangerous rock mass slope of Ya?an&mdash Lugu highway earthquake collapse and shattering-sliding crashing bridge pier fluctuating central axis permanent displacement

Received: 27 September 2010

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http://www.rockmech.org/EN/Y2011/V30/IS2/3995

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