自平衡桩基试验法在深厚软土地区高架车站中的应用研究

Research on Application of Self-Balanced Pile Foundation Testing Method in Elevated Stations in Deep Soft Soil Areas

摘要:

为了验证如通苏湖城际铁路南浔高架站特大桥复杂地质条件下重要桥梁桩基的容许承载力，选取2根钻孔灌注桩，桩径1.0 m，桩长70 m，在原桩上进行自平衡桩基试验，桩身内力测试采用分布式光纤法，通过在桩身内布设传感光纤，形成传感网络，荷载箱加压后，计算传感信号数据得到试桩各段桩侧阻力和桩端阻力，分析得到了测试数据与勘察资料参数、铁路行业规范推荐参数的误差在合理范围内，验证了桩基设计的安全性和经济合理性，说明了自平衡桩基试验法在该地区深厚软弱地层中的应用可靠性，为该地区同类工程桩基设计和优化提供了参考。

Abstract:

To verify the allowable bearing capacity of important bridge pile foundations of the Nanxun Elevated Station Bridge in the Rudong - Nantong - Suzhou - Huzhou Intercity Railway under complex geological conditions, two cast-in-situ bored piles with a diameter of 1.0 m and a length of 70 m are selected to conduct the self-balanced pile foundation tests on the original piles. The distributed optical fiber method is used to measure the internal forces of the piles. By embedding sensing optical fibers inside the piles, a sensing network is formed. After the load box is pressurized, the sensor signal data is calculated to obtain the side resistance and end resistance of each section of the test pile. The analysis shows that the errors between the test data and the survey data parameters and the recommended parameters in the railway industry standards are within a reasonable range. The safety and economic rationality of the pile foundation design are confirmed, demonstrating the reliability of applying the self-balanced pile foundation test method in deep soft soil stratum of this area. The reference is provided for the design and optimization of similar engineering pile foundations in the region.