桥头软基沉降分析及处理研究  

Research on Settlement Analysis and Treatment of Soft Foundation at Bridgehead

作　　者：王广智 WANG Guangzhi(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730010,Gansu,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730010

出　　处：《工程技术研究》2024年第24期154-156,共3页Engineering and Technological Research

摘　　要：随着我国公路建设规模的持续扩大,桥梁体系在深壑峡谷与河流交错地带发挥着卓越的交通疏导效能,但在软弱地基条件下,桥梁与路基过渡区的不均匀沉降引发的桥头跳车问题频出,严重干扰公路正常运行。为确保公路工程持久高效运作,评估与改善桥梁端部软土地基沉降至关重要。为此,文章基于我国西北某地高速公路桥头衔接部分软弱土层问题,提出水泥粉煤灰砂桩技术强化该区域地质基础,基于该方案深入研究路基表面和桩体施工过程中的沉降演变规律,发现经加固后的工后沉降显著降低,可有效抑制桥头跳车现象。With the continuous expansion of the scale of highway construction in China,the bridge system plays an excellent traffic diversion performance in the the zone of deep ravines and gorges intersected with rivers.However,under the condition of soft foundation,the problem of bridgehead jump caused by the uneven settlement of the bridge and subgrade transition zone occurs frequently,which seriously interferes with the normal operation of the highway.In order to ensure the long-term and efficient operation of highway engineering,it is very important to evaluate and improve the settlement of soft soil foundation at the end of bridge.For this reason,based on the problem of weak soil layer at the bridgehead of an expressway in Northwest China,this paper puts forward cement fly ash sand pile technology to strengthen the geological foundation of this area,studies the settlement evolution law of subgrade surface and pile body during construction in depth based on this scheme,and finds that the post-construction settlement after reinforcement is significantly reduced,which can effectively inhibit the phenomenon of bridgehead jump.

关 键 词：桥头软基 不均匀沉降 水泥粉煤灰砂桩 软基加固设计 

分 类 号：TU473.1[建筑科学—结构工程]