Abstract

Air-boosted vacuum preloading, composed of anticlogging vertical drains and an outer booster system, is a new foundation treatment method that is beneficial to accelerating soil consolidation by applying different pressures between soil and vertical drains. Based on the assumption of equal strain, the present paper has simplified the calculation model of the air-boosted vacuum preloading method. Combined with the Newman-Carroll equation, the analytical solution for the consolidation of the double-layer soil foundation is proposed using separation of variables. Moreover, the theoretical solutions of consolidation without well resistance and ideal wells were given, and a chart convenient for engineering practice was acquired. Results show that the setting of well diameter ratio should not be more than 10 in engineering practice. At present, the consolidation theory of air-boosted vacuum preloading is imperfect and only focuses on the reinforcement mechanism of single-layer foundation. Therefore, it is of great significance to perfect the consolidation theory of air-boosted vacuum preloading with multiple layers.

摘要

空气增压真空预压法是一种新型的地基处理方法，由防淤竖井和外增压系统组成，通过在土体和竖井之间施加不同的压力，有利于加速土体固结。本文在等应变假设的基础上，简化了空气增压真空预压法的计算模型。结合Newman-Carroll方程，提出了变量分离的双层土基固结解析解。并给出了无井阻固结和理想井的理论解，得到了便于工程实践的图表。结果表明，工程实践中井径比的设置不宜大于10。现在，空气增压真空预压固结理论不完善，只关注单层地基的加固机理。因此，完善空气增压真空多层预压固结理论具有重要意义。