短程超载真空预压动力排水固结法加固深厚淤泥软基工法研究

针对沿海地区深厚淤泥软土的特点和工程建设时效性的要求,本文在总结软土排水固结S-T曲线规律的基础上提出应用短程超载真空预压动力排水固结法加固深厚淤泥的方法,发现深厚淤泥软土在真空负压、超载正压和动力冲击三者优化组合的作用下,主固结沉降可在短时间内完成,土体强度提高的同时地表吹填土在动力冲击作用下形成超固结的硬壳层。深厚淤泥软土加固后能够满足地基承载力的要求并且能够有效控制工后沉降和不均匀沉降。并通过工程实例,对地基处理后的效果进行分析评价,证明了该工法的可行性和有效性,为沿海地区广泛分布的深厚淤泥软土地基的加固提供了新的途径。

NEW METHOD OF SHORT-RANGE AND OVER-LOADING VACUUM PRELOADING DYNAMIC DRAINAGE CONSOLIDATION FOR REINFORCING DEEP SILT SOFT SOIL GROUND

The paper proposes a new method of reinforcing deep and thick silt.The method uses the short-range and over-loading vacuum preloading dynamic drainage consolidation approach.It is based on the conclusion of soft soil drainage consolidation of S-T roundabout regularities.It is developed according to the characteristics of deep and thick silt soft soil in coastal areas and the requirements of engineering constructions substantial results.The approach also demonstrates that the primary consolidation settlement of deep and thick silt soft soil can be accomplished in a short time,under the optional regrouping of vacuum negative pressure and over-loading positive pressure as well as dynamic impact.The silt soft soil consolidation and settlement are capable of improving the intensity of the solid body while the ground surface dredged fill can become over-consolidating hard shell course under the dynamic impact.The consolidation of deep and thick silt soft soil can meet the requirements of ground bearing capacity and effectively control past-construction settlement and uneven settlement.The case study and the analysis as well as the assessment of the effect of groundwork dealings show the feasibility and validity of this new method.It provides a new way of reinforcing deep and thick silt soft soil groundwork widely spread in coastal areas.