复杂结构软基任意点固结度计算-《高速铁路技术》

文章信息/Info

Title:: Calculation Method of Consolidation Degreeeat at Arbitrary Points of Soft Foundation with Complex Structures

Author(s):: ZHAO Xiaoyan; DING Zihao; YAN Qun; JIANG Chusheng; 1. Southwest Jiaotong University, Chengdu 610031, China;
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: complex structure|soft foundation|consolidation degree|drainage plate|preloading

摘要:: 固结度是软基稳定性计算及固结效果评价的重要参数，现行规范中的固结度确定方法主要适用于软土层厚度均匀的均质理想地基条件。孟加拉国达卡铁路沿线广泛分布三角洲相及冲积相软土，设计使用排水板堆载预压法对软土地基进行处理。该线路地基结构复杂，线路横纵断面软土厚度不均，常有土层尖灭或夹砂层、砂质透镜体，规范方法不能很好地适用于该地基的固结度计算。为此，文章提出适用于求解复杂结构软土地基中任意位置、任意时刻固结度的"有效应力法"，论证了该方法的可行性，并采用该方法对达卡铁路代表性横断面进行计算，得到地基固结度分布情况。研究成果可为软土地基处理地基固结度计算提供参考。

Abstract:: Consolidation degree is an important parameter for foundation stability calculation and consolidation effect evaluation of soft foundation. The calculation method of consolidation degree in current codes is more suitable for homogeneous ideal foundation conditions with uniform thickness of soft soil layers. The delta facies and alluvial clay is widely distributed along Dhaka railway in Bangladesh For the geological condition, the preloading onsolidation method with the drainage plate is adopted for treatment of soil foundation. The foundation structure of the line is complex, soft soil is uneven in cross-section and profile of the railway and there are often soil layer pinchout, or sandy layers and sand lenses. It is considered that the method in the code cannot be well applied to the foundation consolidation degree calculation of Dhaka railway. For this reason, an "effective stress method" is put forward to solve consolidation degree at any position and any time in soft foundation and the feasibility of this method is proved in the paper. This method is used to calculate the consolidation degree of a typical cross-section of Dakar railway. Research results can provide reference for the calculation of consolidation degree in soft soil foundation treatment.