软土地区倒装路面结构的差异沉降控制标准研究

Study on Differential Settlement Control Criterion of Inverted Pavement Structure in Soft Soil Region

为得到软土地区典型倒装路面结构的差异沉降控制标准,采用数值分析方法,对路基双侧拼宽下倒装路面结构的差异沉降控制标准进行研究。结果表明,若底基层容许拉应力为0. 139 MPa,则容许差异工后沉降为2 cm、路拱横坡变坡率为0. 2%;若底基层容许拉应力为0. 35 MPa时,最大差异工后沉降的控制标准可提高到5 cm,容许的路拱横坡变坡率可提高到0. 5%。相对于倒装路面,半刚性路面对差异沉降的容忍性更高。

In order to obtain the differential settlement control standard of typical inverted pavement structure in soft soil region, the differential settlement control standard of inverted pavement structure under two-sided widening of subgrade was studied by numerical analysis method. The results show that if the allowable tensile stress of the subbase is 0.139 MPa, allowable differentia post-construction settlement and slope rate of cross slope of road arch will be 2 cm and 0.2%, respectively. If the allowable tensile stress of the subbase is 0.35 MPa, allowable differential post-construction settlement and slope rate of cross slope of road arch will be increased to 5 cm and 0.5%, respectively. Compared to inverted pavements, semi-rigid pavements are more tolerant of differentia settlement.