摘要
针对高速公路路基改扩建后的差异沉降问题,采用水泥搅拌桩对路基进行加固处理。以某高速公路拓宽工程为背景,通过室内模型试验,系统研究了荷载作用下水泥搅拌桩的单桩承载力特性,重点考察了桩身刚度、桩径及持力层刚度等影响因素。研究结果表明:当持力层刚度较小时,Q-s曲线无明显拐点;而当持力层刚度较大时,Q-s曲线出现明显拐点。此外,路基沉降量随桩径增大而减小;持力层刚度较大时,侧摩阻力呈单峰分布,随着持力层刚度降低,侧摩阻力分布规律转变为双峰。研究可为水泥搅拌桩在路基加固中的应用提供理论依据和实践参考。
To address the issue of differential settlement after the reconstruction and expansion of highway subgrades,cement mixing piles were used for subgrade reinforcement.Based on a highway widening project,a laboratory model test was conducted to systematically study the bearing capacity characteristics of single cement mixing piles under load.The study focused on the influence of factors such as pile stiffness,pile diameter,and bearing stratum stiffness.The results indicate that when the bearing stratum stiffness is low,the Q-s curve shows no obvious inflection point;however,when the bearing stratum stiffness is high,a distinct inflection point appears in the Q-s curve.Additionally,subgrade setlement decreases with an increase in pile diameter.When the bearing stratum stiffness is high,the side friction resistance exhibits a unimodal distribution,whereas with decreasing bearing stratum stiffness,the distribution pattern shifts to a bimodal form.This research provides theoretical support and practical references for the application of cement mixing piles in subgrade reinforcement.
作者
曾森华
郝文拯
ZENG Senhua;HAO Wenzheng
出处
《重庆建筑》
2025年第3期92-94,共3页
Chongqing Architecture
关键词
地基承载力
模型试验
参数敏感性分析
持力层刚度
Foundation Bearing Capacity
Model Test
Parameter Sensitivity Analysis
Bearing Stratum Stiffness
