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在软土地基上进行道路加宽面临稳定性不足、不均匀沉降大等问题。以某湖滨路加宽改造工程为背景,针对单侧加宽和高填土等特点,对工程的稳定性和变形进行了系统研究。首先通过现场取土进行室内试验确定了土层的岩土力学参数,然后结合设计资料对拟采取的加固措施进行了数值模拟。数值分析表明,在坡脚处采用水泥搅拌桩加固可以有效的提高路基的整体稳定性,并减小加固区的沉降变形。此外,为了加强新老路堤的结合,采取老路堤开挖和土工格栅等处理措施很有必要。从施工期的现场监测数据可以看出,填土部分和坡脚处的变形较大。在保证了填土质量和施工进度后,整个工程的变形属于控制范围内,竣工后的运行情况良好。
On the soft ground to widen the road facing the lack of stability, uneven settlement and other issues. Based on the widening and reconstruction project of Hubin Road, the stability and deformation of the project are systematically studied in view of the characteristics of one-sided widening and high fill. Firstly, the soil mechanics parameters of the soil layer were determined by taking soil tests in the field and the numerical simulation of the reinforcement measures to be taken in combination with the design data was carried out. Numerical analysis shows that the use of cement mixing piles at the foot of slope can effectively improve the overall stability of the roadbed and reduce the settlement deformation in the reinforcement zone. In addition, in order to strengthen the combination of old and new embankments, it is necessary to adopt measures such as excavation of old embankments and geogrids. It can be seen from the on-site monitoring data during the construction period that the deformation at the filling part and the slope foot is larger. After ensuring the filling quality and construction progress, the deformation of the whole project belongs to the control range, and the operation after completion is in good condition.