某变电站灌注桩承载特性研究

Research on Bearing Characteristics of Bored Piles in a Substation

为研究钻孔灌注桩承载特性以及工程适用性,本文依托某变电站项目,开展了钻孔灌注桩试桩竖向抗压静载试验和桩身应力监测,分析了竖向荷载作用下桩身沉降规律和内力分布特征。结果表明,随着竖向荷载的增加,试桩沉降逐渐增大,曲线斜率逐渐增加,Q-S曲线未出现明显的陡降段。试桩最大沉降为15.62mm,竖向抗压承载力均大于4800kN。本次试验的3根试桩均未达到极限破坏状态,桩端阻力还未达到限值,而桩侧摩阻力发挥较为充分。

In order to study the bearing characteristics and engineering applicability of bored piles,this paper carries out the vertical compressive static load test and pile stress monitoring of bored piles based on a substation project,and analyzes the settlement law and internal force distribution characteristics of the pile under vertical load.The results show that,with the increase of vertical load,the settlement of the test pile gradually increases,the slope of the curve gradually increases,and the Q-S curve does not show an obvious steep drop section.The maximum settlement of the test pile is 15.62 mm,and the vertical compressive bearing capacity is greater than 4800 kN.The three test piles in this test do not achieve the ultimate rupture state,and the resistance at the end of the pile does not reach the limit,while the friction resistance on the pile side is fully exerted.