基于空间受限的非对称基桩锚桩法静载试验技术

Static Load Test Technology of Asymmetric Foundation Pile Anchor Pile Method Based on Space Restriction

确定钻孔灌注桩的承载力和沉降特性的方法一般是利用千斤顶加载负荷对试验桩进行轴向静载试验。在静载试验中,反力装置提供桩上荷载,依据反力装置类型分为堆载法、锚桩法和自平衡法等。然而基于空间受限、地质条件差、当地连续降雨的不利条件,能够采用工程桩做为锚桩的条件下,锚桩法静载试验有较于堆载法对既有条件的适应性强、安全可靠,较于自平衡法试验结果直观、准确。本文结合泰国MEA孔提地下变电站项目详细分析了空间受限条件下非对称基桩锚桩法试桩施工工法,通过该工法的应用取得了良好的安全及经济效果,值得推荐。

The method for determining the bearing capacity and settlement characteristics of bored piles is generally to conduct axial static load tests on the test pile using a jack to load it.In the static load test,the reaction device provides the load on the pile,which can be divided into pile loading method,anchor pile method,and self balancing method based on the type of reaction device.However,due to the unfavorable conditions of limited space,poor geological conditions,and continuous rainfall in the local area,the anchor pile method static load test has stronger adaptability,safety,and reliability to existing conditions compared to the pile loading method,and the results are intuitive and accurate compared to the self balancing method test.This article provides a detailed analysis of the asymmetric foundation pile anchor pile test pile construction method under spatial constraints,combined with the MEA Kongti underground substation project in Thailand.The application of this method has achieved good safety and economic results,and is worth recommending.