Study on the Influence Range and Sensitivity of Differential Settlement of Widening Highway
In order to determine the influence range of differential settlement during the operation period of the widening highway,the settlement development law of the widening highway was simulated and analyzed by ABAQUS finite element software based on the widening project of a first-class soft soil foundation highway.The slope changing rate was introduced as the control standard of differential settlement to evaluate the influence of differential settle-ment of widened highway during operation;Considering the bending strength Rs of lime flyash crushed stone base,a method was proposed;Furtherly considering the groundwater level,the thickness of silty clay layer and the com-pression index of silty clay,a three-factor and three-level orthogonal test was designed to study the variation char-acteristics of the influence range of differential settlement of widened soft soil foundation highway under different factor levels.The results show that the consolidation settlement of the foundation is the main reason for the settle-ment of the widened highway pavement.The settlement development of each point at the top of the widened section is significantly affected by the spatial position.With the decrease of the consolidation rate of the foundation,the de-velopment rate of the maximum settlement gradually decreases.After 6 years of operation,the development rate gradually stabilizes,and the location of the maximum settlement remains at 2/3 of the widening section;The slope changing rate developes rapidly in the early stage of operation,and then the gradually slows down,and all don't exceed the limit;During the operation period,the growth rate of the differential settlement influence range of the widened highway gradually decreases and the final differential settlement influence range is 4.05 m;The influence range of differential settlement is the most sensitive to the change of groundwater level,then the thickness of silty clay layer and the compression index of silty clay.In practical engineering,the treatment of the influence range of differential settlement should focus on groundwater level.
road engineeringthe influence range of differential settlementwidening soft soil highwayslope changing ratesensitivity
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维普
