Abstract
In China, large-area excavation and filling engineering has increased rapidly with the expansion of construction land. The quality of filling engineering is the most important guarantee for the stability of building structures. Among all research on fill soil, the compaction characteristics are significant for indicating the strength and stability of filling engineering. In this paper, two layers of loess fill soil were compacted by a self-manufactured test system with three different compaction energies. Based on the variation in the soil bottom pressure obtained in the tests, the influence of the compaction parameters on the soil bottom pressure was investigated. The results show that the compaction curve can be used instead of the curve of the change in soil bottom pressure with water content; as the soil density increases, the soil bottom pressure increases to the maximum. The relation of the energy consumption ratio of the soil bottom (σ/σz) and the number of soil layers is exponential and reveals the stability of the soil skeleton formed during compaction. This paper describes the compaction characteristics of loess fill soil from the perspective of energy transfer, and the conclusions provide a theoretical basis for soil filling engineering.
Highlights
There is a large amount of filling engineering for the expansion of construction land in China [1]
From the perspective of energy transfer, this paper studies the relationship between compaction impact force and soil bottom pressure under different compaction energies and soil layers and determines the energy transfer process under various compaction conditions
The compaction test results of the six groups are listed in Table 4, and the compaction curves are shown in Fig 2(A) and 2(B)
Summary
There is a large amount of filling engineering for the expansion of construction land in China [1]. Many serious problems hinder the process of controlling soil strength and stability during compaction. Various engineering distresses, such as pavement cracking due to insufficient fill strength, have emerged one after another in Handan, China [2]. Due to the deficient compaction of roadbeds in the Beijing-Kowloon railway, many roadbed subsidence events and other distresses have occurred [4]. To reduce the engineering distresses of fill, compaction parameters must be strictly controlled. Accurately determining the degree of compaction is a crucial subject in filling engineering. The compactness is often used to represent the quality of the fill. The compaction method utilized, such as roller compaction, tamping, and vibrating compaction, affects the compaction quality. Regardless of the method, the soil is compressed to the required density by compressing the soil
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