基于单点沉降计的高填方路基沉降分析

摘要

依托兰永一级高速公路典型高填方路基工程,对涉及到高填方不良土质采用的浅层换填法、水泥粉煤灰碎石桩法、水泥搅拌桩复合地基法的填方路基,采用现场安装单点沉降计的方式时刻监测路基沉降,根据实测数据分析路基沉降.在实际工程填筑过程中,每填筑3 m高,共埋设12个单点沉降计,得到大量现场实测数据.通过对比分析路肩和超车道的实测数据,并绘制其变形曲线,得到两者的沉降规律.为高填方路基的设计和施工提供一定的参考.%Relying on the typical Highfill subgrade engineering on the first-class highway in Lanyong,the subsidence of fill subgrade which adopts the shallow soil replacement method,cement fly-ash gravel pile method and cement mixing pile composite foundation method for the Highfill bad soil will be monitored in the on-site single-point subsidence gage installation way at any moment,as a result,a large number of measured data will be obtained to analyze the subgrade subsidence.During the actual filling of engineering, 12 single-point subsidence gages will be buried when 3m height is filled,at this moment,a large number of measured data can be obtained.If the measured data of road shoulder and overtaking lane are compared and analyzed,and the deformation curve is drawn,the subsidence rules will be got.Therefore,it is good for pro-viding certain reference for the design and construction of Highfill subgrade.