排水预压法加固某高速公路软基效果的工程实例分析

以某高速公路应用塑料排水板堆载预压法处理深层软基为例,通过监测对加固效果进行了分析。结果表明：加固后,土体的十字板剪切强度提高了40%,含水率大为减少;堆载结束后80 d内土体固结度达到90%以上,且土体的沉降趋于稳定,加固深度在15 m以上,加固效果明显。应用塑料排水板堆载预压法处理深厚层软土,可以加快软土的沉降速率,缩短工期,降低成本,是一种即经济又合理的地基处理方法。

Case Study on Effect of Consolidation of Expressway Soft Ground with Drain and Preloading Method

As an example of application of plastic plates drain preloading method in soft ground for expressway,this paper analyzed its reinforcement effects by monitoring.The conclusions were reached as follows: After reinforcing,the vane shear strength of soil was improved forty percent and its water content decreased sharply.The degree of consolidation of the soft soil was above ninety percent and the settlement of soil tended to be stable in 80 days after ending of surcharge load.The depth of reinforcement reached above 15 meters and the effect of reinforcement was obvious.Applying plastic plates drain preloading method to strength soft soil can speed up the velocity of settlement,shorten construction period and reduce cost.So it is an economical and reasonable method to treat foundation.