水泥稳定低液限粘土回填路基试验研究  

Experiment Study on Stabilization of Low Liquid Limit Soil with Cement in Subgrade Filling

作　　者：游强 罗勇军 唐宇航 

机构地区：[1]漯河市公路建设和养护中心,河南 漯河 [2]漯河市公路工程建设总公司,河南 漯河 [3]长沙理工大学,湖南 长沙

出　　处：《土木工程》2019年第9期1330-1335,共6页Hans Journal of Civil Engineering

摘　　要：以漯河市京港澳高速临时辅道路基填筑工程为例,首先对取土场的素土进行基本的物理特性试验与分析。研究水泥稳定低液限黏土的化学反应原理与微观机理为试验结果提供理论分析。用不同的水泥剂量稳定低液限黏土,研究它们的击实特性,揭示水泥用量与最佳含水量和最大干密度之间的规律,为实际压实过程提供依据,比较它们的CBR值,确定水泥的最佳用量,并通过无侧限抗压强度评定掺量后水泥稳定土的路用性能。研究表明:水泥稳定土的最大干密度随水泥掺量增加而增加,水泥稳定土的CBR在一定范围内随水泥掺量增加而增大,随后趋于稳定。在满足路用性能条件下,路基94区采用4%水泥掺量的稳定土,96区采用5%水泥掺量的稳定土方案最为经济合理。Taking the temporary auxiliary subgrade filling project of Beijing-Hong Kong-Macao Expressway as an example, firstly, the basic physical properties of the borrowed soil are tested and analyzed. The chemical reaction principle and microscopic mechanism of studying cement stabilized low liquid limit clay provide theoretical analysis for the test results, stabilizing low liquid limit clays with different cement dosages, studying their compaction characteristics and revealing the law between cement dosage and optimum water content and maximum dry density to provide a basis for the actual compaction process;comparing their CBR values to determine the optimum amount of cement;and evaluating the road performance of cement stabilized soil by the unconfined compressive strength. The result shows that the maximum dry density of cement stabilized soil increases with the increase of cement content. The CBR of cement stabilized soil increases with the increase of cement content within a certain range, and then tends to stabilize. While meeting road performance, the plan that the 94-area of subgrade uses 4% cement mixed stable soil, and the 96-area uses 5% cement content stable soil is the most economic and reasonable.

关 键 词：水泥改良土 最佳含水量 承载比CBR 无侧限抗压强度 

分 类 号：U41[交通运输工程—道路与铁道工程]