基于大三轴试验的高速液压夯处治粉土地基力学特性

doi:10.6040/j.issn.1672-3961.0.2024.266

摘要/Abstract

摘要： 为揭示高速液压夯处治粉土地基的力学特性,通过模拟不同夯击能作用,开展压实粉土室内大三轴试验,确定不同夯击能及围压条件下粉土应力-应变规律,并基于邓肯-张模型确定计算力学参数。结果表明,随着夯击能的增大,粉土试件峰值应力增大,其中经150 kJ能级处治后的粉土地基峰值应力最大可达396 kPa,为70 kJ能级处治地基的1.3~1.5倍,不同夯击能条件下,150 kJ能级处治后的地基剪缩现象最为明显;同夯击能级条件下,随着围压的增加,粉土试件的峰值应力增大,且峰值应力对应的应变增大,150 kJ夯击能级处治后的土体在200 kPa围压下的峰值应力可达530 kPa,为相同处治条件100 kPa围压下的2倍。参考邓肯-张计算模型,计算了不同夯击能处治后粉土地基的力学参数,研究成果为高速液压夯技术推广应用提供理论支撑。

关键词: 高速液压夯, 粉土地基, 室内大三轴试验, 剪切特性, 邓肯-张模型

Abstract: To reveal the mechanical characteristics of rapid impact compaction treatment on pulverized soil foundations, an indoor triaxial test was conducted on compacted pulverized soil. This test simulated the effects of different tamping energies, determined the stress-strain behavior of pulverized soil under varying tamping energies and confining pressures, and calculated the mechanical parameters based on the Duncan-Chang model. The results showed that as tamping energy increases, the peak stress of the pulverized soil specimens also increases. Specifically, the peak strain of the pulverized soil foundation treated with 150 kJ of tamping energy could reach up to 396 kPa, which was 1.3 to 1.5 times greater than that of the foundation treated with 70 kJ. The shrinkage of the foundation after treatment at 150 kJ of tamping energy level was most pronounced in the impact tamping. Moreover, under the same tamping energy level, the peak stress of the pulverized soil specimens increased with the rise in confining pressure, with the peak stress corresponding to the strain of the specimen. For instance, at a confining pressure of 200 kPa, the peak stress of the soil treated with 150 kJ of tamping energy could reach 530 kPa, which was double that observed under the same treatment conditions at a confining pressure of 100 kPa. Using the Duncan-Chang calculation model, the mechanical parameters of the pulverized soil foundation after treatment with different tamping energies were calculated. These research findings provided theoretical support for the promotion and application of RIC technology.

Key words: rapid impact compaction, pulverized soil foundations, indoor large triaxial test, shear characteristics, Duncan-Chang model

中图分类号:

U416.1

江大海,刘亚珍,齐迪,吕斌,宫海霞,王楚怡,张宏博. 基于大三轴试验的高速液压夯处治粉土地基力学特性[J]. 山东大学学报 (工学版), 2026, 56(1): 72-79.

JIANG Dahai, LIU Yazhen, QI Di, LÜ Bin, GONG Haixia, WANG Chuyi, ZHANG Hongbo. Mechanical characteristics of rapid impact compaction technology treating pulverised soil foundations based on large triaxial tests[J]. Journal of Shandong University(Engineering Science), 2026, 56(1): 72-79.

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