Abstract

Ground treatment via the vacuum preloading technique has been extensively used in coastal belts worldwide in the field of civil engineering. However, due to the poor effect of traditional ground treatment, a new technology of combined air-booster and straight-line vacuum preloading without sand was proposed. Field tests were conducted in this study to illustrate the treatment effect. Based on the monitoring data of field tests, this paper carefully studied the pore water pressure, and an empirical formula for predicting the average consolidation degree and settlement was provided. In addition, both the soil sensitivity and the undrained shear strength before and after vacuum preloading treatment were discussed. Finally, to illustrate the phenomenon in which the combined air-booster and straight-line vacuum preloading without sand technique can decrease the pore water pressure or accelerate the soil consolidation, a two-dimensional elastoplastic model was established, and the validity of the model was verified.

摘要

真空预压技术地基处理已广泛应用于世界各地的海岸带土木工程领域。但由于传统地基处理效果不佳，提出了一种空气增压与直线真空预压相结合的无沙技术。本研究进行了现场试验以说明治疗效果。本文基于现场试验监测数据，对孔隙水压力进行了深入研究，给出了预测平均固结度和沉降的经验公式。此外，还讨论了真空预压处理前后的土壤敏感性和不排水抗剪强度。最后，