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首页> 外文会议>Conference on Geotechnical Engineering for Transportation Projects v.2(Geo-Trans 2004); 20040727-20040731; Los Angeles,CA; US >AN EVALUATION OF INCREASED LATERAL LOADS ON BRIDGE FOUNDATIONS DUE TO LIQUEFACTION
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AN EVALUATION OF INCREASED LATERAL LOADS ON BRIDGE FOUNDATIONS DUE TO LIQUEFACTION

机译：液化导致桥梁地基侧向荷载增加的评估

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摘要

The results of a lateral spread study are presented in this paper for a bridge-widening project in Southern California. The existing bridge spans a creek underlain by loose to medium dense, saturated sands. The site is highly susceptible to liquefaction in the event of the design earthquake. Our primary geotechnical design concern was the possibility of bridge collapse resulting from a liquefaction induced slope failure against the deep foundation at the abutment. A combination of limit equilibrium and displacement based analysis techniques were used to assess the problem, and to estimate the shear and moment demands on the new large diameter CIDH pile foundation. By installing a single row of stone columns at the mid-height of the abutment slope, we were able to demonstrate that the estimated lateral load resulting from liquefaction would not exceed the plastic capacity of the proposed deep foundation. Our approach was generally consistent with the recently published, and AASHTO sponsored, NCHRP 12-49 project regarding seismic design guidelines for new bridges and the effects of seismic displacements against bridge foundations.
机译：本文介绍了横向扩展研究的结果，该研究用于南加州的桥梁拓宽项目。现有的桥梁跨过一条小溪，下面是松散的至中等密度的饱和沙子。如果发生设计地震，该地点极易发生液化。我们主要的岩土工程设计关注是由于液化引起的对基台深层基础的边坡破坏而导致桥梁倒塌的可能性。结合极限平衡和基于位移的分析技术来评估问题，并评估新的大直径CIDH桩基的剪切力和弯矩要求。通过在基台斜坡的中部高度安装一排石柱，我们能够证明液化产生的侧向荷载估计值不会超过拟议的深层基础的塑性承载力。我们的方法总体上与AASHTO最近发布并由AASHTO赞助的NCHRP 12-49项目有关，该项目涉及新桥梁的抗震设计准则以及地震位移对桥梁基础的影响。

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