Abstract
Mechanical properties are important indexes to evaluate the improvement effect and engineering performance of cement‐stabilized loess (CSL). This paper presents a comparison of the mechanical properties of CSL compacted using hammer quasi‐static compaction method (QSCM) and vertical vibration compaction method (VVCM). The compaction properties, unconfined compressive strength (UCS), splitting strength (SPS), and resilient modulus (RM) of the laboratory‐compacted CSL using VVCM and QSCM are tested and compared. Furthermore, the effects of compaction method, cement content, compaction coefficient, and curing time of the CSL specimens are investigated. In addition, field measurements are carried out to validate the laboratory investigations. The results show that the laboratory‐compacted CSL using VVCM has a larger dry density and smaller optimum water content than that using QSCM. And the compaction method has a great influence on the mechanical strength of CSL. The UCS, SPS, and RM of the specimen produced using VVCM are averagely 1.17 times, 1.49 times, and 1.17 times that of CSL produced using QSCM, respectively, and the UCS, SPS, and RM of the specimens produced using these two methods increase linearly as the cement content and compaction coefficient increase, while the mechanical strength growth curve experiences three periods of increasing sharply, increasing slowly, and stabilizing with the curing time increased. Moreover, the results also show that the mechanical properties of laboratory‐compacted CSL using VVCM have a better correlation of 83.8% with the field core samples.
Highlights
In recent years, the construction of intercity railway has promoted the economic development and optimized the transportation capacity
The SPS of cementstabilized loess (CSL) compacted using vertical vibration compaction method (VVCM) can be increased by 49% compared with that using quasistatic compaction method (QSCM), and the increase of splitting strength is more significant than that of compressive strength at the same condition. erefore, the compaction method has a greater influence on the SPS. is is consistent with Bahar’s study which showed the dynamic compaction method was better than the static compaction method
E microstructure of the specimen analyzed by SEM [9] shows that there are large pores in the CSL specimen compacted using QSCM, which reduces the contact area between loess particles and shows low strength and weak resistance to deformation, while the VVCM can significantly change the internal structure of filler, which is conducive to the mutual filling of loess particles and makes the distribution of loess particles more uniform
Summary
The construction of intercity railway has promoted the economic development and optimized the transportation capacity. With the increasing construction of intercity railway, more stringent requirements are put forward for the subgrade engineering. As a kind of Quaternary Aeolian sedimentary silt, is mainly composed of silt and has large pores with particle size about 1 mm, which leads to developed vertical joints, metastable structure, and collapsibility in varying degrees [1, 2]. It has low bearing capacity and high compressibility and is prone to significant subsidence after
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