水泥加固综合管廊淤泥质围岩现场试验研究

Field Tests of Cement Stabilized Soft Soils for Utility Tunnels

由于沉积环境和物质组成的差异,不同地区软土以水泥作为固化剂加固效果差别较大。以某沿海城市综合管廊工程为依托,通过现场试验的方法,就不同水泥,掺入工艺及不同水泥掺量对该地区土层的加固效果进行分析,同时通过有限元模拟,分析了土层加固前后的力学特性。研究结果表明对于该工程地质条件,适宜采用湿法施工;随着水泥掺入比的增加各试件的无侧限抗压强度也随之越大,考虑到经济效益,选用水泥掺入比为25%进行该软土地层的加固;土层加固前,综合管廊有受拉破坏的危险,土层加固后综合管廊受力处于合理状态。

The soft soils improved by the cement agents have received different results due to the significant variation of the components and sedimentary environments of soft soils in different regions.This paper presents the field test results of soft soil mixed with different content of cement for the utility tunnel construction project in a coastal city.The performance of the utility tunnel in soft soils before and after the improvement was also analyzed by using finite element method.The test results indicate that the wet mixing method is more appropriate to apply the cement in the onsite soft soil strata.The compressive strength of cement mixed soil increases with the cement contents.The most cost-effective cement content is 25%.The numerical analysis results indicate that the utility tunnel would have a tension failure potential and the performance of the utility tunnel after the soil improvement is satisfactory.