Effects of Cement-Modified Soil as Blocking Cushion of Saline Soil Subgrade

Abstract

This paper puts forward a novel approach called cement-modified soil (CMS) blocking cushion technology to reinforce the subgrade in saline soil region: the cushion layer of composite foundation and a roadbed partition layer are combined into one CMS layer. The effectiveness of the proposed approach was verified through outdoor experiments on the saline soil section (DK821+600-DK821+900) of the newly built Lanxin High-Speed Railway. The experimental results show that the CMS layer can effectively adjusts the pile-soil stress ratio of the composite foundation, thereby enhancing the bearing capacity of the composite foundation and reducing the total settlement of the subgrade; it is also verified that the CMS layer greatly suppresses the upward migration of capillary water and water vapor in the foundation soil, and curbs the migration of salt, preventing the secondary salinization of the railway subgrade. Overall, this research provides a simple and low-cost subgrade reinforcement technique for saline soil regions, shedding new light on the engineering application of the CMS.

Marble Powder as a Soil Stabilizer: An Experimental Investigation of the Geotechnical Properties and Unconfined Compressive Strength Analysis

“…Figure 9 demonstrates an upward trend in unconfined compressive strength (UCS) as curing time increases from 0 to 28 days. This confirms that pozzolanic reactivity and hardening in stabilized soils progress over extended periods as more hydration products are formed [ 57 , 58 , 59 , 60 ]. Initially, the UCS values are pretty low without curing.…”

Calculation of Negative Frictional Resistance of Foundation Pile in Deep Fill Foundation

“…Resistance. Within the elastic range, the pile-bottom settlement basically has a linear relationship with pile-bottom resistance [11][12][13][14], and the pilebottom settlement increases with pile-top settlement. Since the current code [15] forbids excessive pile-top settlement, it is assumed that the pile-bottom bearing layer does not have plastic deformation.…”