泡沫轻质土抬高加宽路基变形规律研究

Research on Deformation Law of Foam Light Soil Raised and Widened Subgrade

采用数值模拟方法,通过对深汕西高速某抬高及加宽路基段典型施工工序进行分析,获取工序1~工序4新旧路面对应的横向差异值分别为7.50、17.21、4.60、2.50 mm,满足路基横向允许最大差异沉降的安全阈值,其最大沉降位于路基加宽新填土区域内。新路面工后沉降变形不同影响因素分析表明:抬高路基填筑密度与高度越大,工后新路面沉降变形就越大;新填土材料的密度对新路面沉降无明显影响,而对旧路面影响大;施工填筑速率越慢,则工后的新路面沉降变形就越小,也越能抑制新路面工后的大变形。

By numerical simulation method,the typical construction procedures of elevation and widening subgrade sections of the Shenshanxi Expressway iss analyzed.And the corresponding lateral difference values of the new and old pavements in Procedures 1-4 are obtained of 7.50,17.21,4.60,2.50 mm respectively,which meet the safety threshold of the maximum allowable lateral differential settlement of the subgrade.The maximum settlement is located in the newly filled area of the widened subgrade.The analysis of the influence of different factors on the post construction settlement deformation of the new pavement shows that the greater the filling density and height of the raised subgrade,the greater the post construction settlement deformation of the new pavement.The density of the new fill material has no obvious influence on the settlement of the new pavement,but has great influence on the old pavement.The slower the construction filling rate is,the smaller the settlement deformation of the new pavement after construction is,and the greater the deformation of the new pavement after construction is restrained.