扶壁式挡墙在贵州高速公路建设中适宜性研究

Study on the Suitability Designing of the Counterfort Retaining Wall on the Filling Base During the Highway Construction in Guizhou Province

为解决厦蓉线贵州境毕节至生机段高速公路二堡互通在已建填方体上修建高挡墙,或者下伏填方与上覆高挡墙同时施工问题,鉴于高路肩墙支挡设计中填方体基底的承载力不足问题,根据理论分析及稳定性计算,设计出本段填方支挡所需要的较为合理的7,8,9,10m的扶壁式挡墙尺寸。将扶壁式挡墙引入贵州省内的高速公路支挡防护,应用于下伏填方体基底时上覆高挡墙的设计,从而达到在确保路基稳定性的前提下,节约投资,加快施工进度,缩短施工工期的目的。

The gravity retaining walls and the pile cap retaining walls are usually designed and constructed during highway construction in Guizhou province when the basis of retaining walls is the filling base,or the lower filling base and overlying retaining walls isconstructed at the same time.According to the theoretical analysis and stability calculation,the reasonable 7,8,9,and 10 msizes of counterfort retaining walls have been designed to solve the insufficient bearing capacity problem of the filling base in high shoulder wall support designing in Erbao interchange of Bijie-Shengji highway.The counterfort retaining walls have been introduced as the highway block protection in Guizhou highway,which is applied to the protection of the high retaining wall designing when the basis is filling base.So that the purpose of saving investment,speeding up construction progress and shortening construction period have been achieved under the premise of ensuring roadbed stability.