西宁火车站改造工程桩基抗拔极限承载力的试验及模型研究

Experimental and Modeling Study on Pullout Ultimate Bearing Capacity of Pile Foundation in XiNing Railway Station Reconstruction Project

地下工程中承载力的确定对地下工程的施工与设计有着重要意义,但受荷载装置、试桩费用、工程进度等条件限制,许多桩未能加载至破坏状态,不能直接得到极限承载力等重要参数.以西宁火车站改造工程的抗拔试验为例,根据静载试验得到的Q-S曲线,运用MATLAB软件采用最小二乘法分别拟合出3种抗拔极限承载力预测函数模型的参数,并提出三项式模型适用于该地区的抗拔桩极限承载力预测模型.

Determining the bearing capacity of underground engineering has an important significance for the de- sign and construction, But due to the limit of loading device, test cost, engineering schedule and other condi- tions, many piles can＇ t be loaded, which can not directly get the important parameters like ultimate bearing ca- pacity and so on. Pull-out test in Xining Railway Station renovation project is taken as the example, based on Q- S curves obtained from the static loading tests, and by using MATLAB software, parameters of three kinds of pre- diction function models of pullout ultimate bearing capacity are fitted through least square method, and trinomial model a prediction model of the ultimate bearing capacity of uplift pile which is suitable for this area is pro- posed.