静载试验条件下的灌注桩承载特性研究

Study on Bearing Characteristics of Cast-In-Place Piles Under Static Load Test

灌注桩在基础工程中使用广泛,其具有承载力高、场地适应性强、稳定性好等优点。本文通过有限元软件建立桩基静载试验模型,分析在各种加载条件下的灌注桩的桩顶沉降、桩身轴力和侧摩阻力的变化规律,并通过曲线拟合了桩顶沉降-荷载变化曲线。通过数值模型可全面地了解灌注桩的承载特性以及桩身的完整性,保证桩基础的稳定性和安全性。最后对比分析了钢筋应力计测值与有限元模拟值,发现钢筋应力计测值分布在有限元模拟值附近,表明桩基数值模拟结果准确。

Cast-in-place pile is widely used in foundation engineering,which has the advantages of high bearing capacity,strong adaptability to site and good stability.In this article,the static load test model of pile foundation is established by using finite element software,and the change law of pile tip settlement,pile shaft axial force and side friction resistance under various loading conditions is analyzed,and the pile tip settlement-load change curve is fitted by curve.The bearing characteristics of cast-in-place pile and the integrity of pile body can be comprehensively understood through numerical model to ensure the stability and safety of pile foundation.Finally,the measured values of reinforcement stress meter and finite element simulation values are compared and analyzed.It is found that the measured values of reinforcement stress meter are distributed near the finite element simulation values,indicating that the numerical simulation results of pile foundation are accurate.