Abstract
The prediction of foundation settlement is an important topic in loess filling engineering. Based on a filled foundation in Yan’an, China, this study explores the consolidation characteristics of compacted loess with different compaction energy and consolidation pressure through consolidation tests, analyzes the strain-time curve and refines the curve within 2 h, separates the primary and secondary consolidations, and obtains the critical time point between the primary and secondary consolidations. Deformation rate S t ′ and cumulative deformation St were introduced to analyze the S t ′ − St curve at the secondary consolidation stage; the secondary consolidation coefficient was employed to describe the secondary consolidation characteristics of compacted loess. According to the secondary consolidation characteristics, a prediction model of loess settlement considering different compaction energy and fill thickness was proposed, and the applicability of the model was further analyzed. The model will facilitate in guiding the design and construction of loess filling engineering.
Highlights
With the progress of China’s west development strategy and the improved urbanization level, construction land in western loess area has become increasingly limited, and a large number of loess filling projects have appeared. e height of some filling works exceeds 100 m
Its subsidence often lasts for several years or even decades and has become an important factor affecting the safety of engineering construction and economic development in the western loess area. us, investigation on the postconstruction settlement prediction of high-fill loess foundations has become an important topic in foundation stability research
Some researchers have focused on the secondary consolidation deformation of high filling soil, but the results differ greatly
Summary
With the progress of China’s west development strategy and the improved urbanization level, construction land in western loess area has become increasingly limited, and a large number of loess filling projects have appeared. e height of some filling works exceeds 100 m. Yin et al [4] showed that the secondary consolidation coefficient changed with time and was determined by the consolidation pressure, load incremental ratio, and surcharge preloading, based on experimental results in the laboratory. Alonso et al [13] proposed an empirical formula for calculating the secondary consolidation settlement after construction by analyzing the results of field preloading and remodeling compression tests; they believed that the secondary consolidation coefficient was an over consolidation ratio function unrelated to time. Ge et al [16] conducted a one-dimensional consolidation creep test on remolded loess; they analyzed the degree of compaction, moisture content, and vertical pressure, and found them to be important factors affecting the secondary consolidation characteristics of loess. A settlement prediction model considering compaction energy and fill thickness was proposed, and its applicability was analyzed
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