软土地区非埋式桩板路基适用性分析

Applicability Analysis of Non-embedded Pile-Board Subgrade in Soft Soil Area

选取沪杭客运专线桩板结构路基工程典型断面,建立现场观测系统,并进行长期观测。根据桩板结构的平面计算分析模型,对深厚软土地区非埋式桩板结构内力进行分析。结果表明:承台板及托梁主筋内力实测值与计算值相差不大,实测弯矩与计算弯矩吻合,且实测值远低于结构抵抗弯矩值;桩基的分散传递作用改善了深厚软土地基受力特性,板土接触应力较小,最大值为0.13 MPa;非埋式桩板结构在软土地区具有较好的适用性。

The paper put in place a long-term in-situ monitoring system for the chosen typical cross section of pileboard subgrade underpinning Shanghai-Hangzhou passenger dedicated line.With the help of plane calculation analysis model,it analysed the internal forces of the non-embedded pile-board structure in deep-thick soft soil areas.The results show that no visible difference is noticed between the measured data and the calculated value for the internal forces of the bearing platform and the main reinforcement bearing.At the same time,the bending moment measured and that calculated stand consistent,and the measured data falls far below the bending resistance of the structure.The pile subgrade changes the mode of force transfer,as the contact stress between plate and soil caps at0.13 MPa,enhancing the force bearing performance of the deep-soft soil subgrade.