不同加载速率及地基处理方式对软土地基稳定性数值分析

Numerical Analysis on Stability of Soft Soil Foundation under Different Loading Rate and Foundation Treatment

公路建设过程中常遇到软土地基,而软土地基的稳定性直接决定了公路的安全性。结合实际工程,开展不同加载速率和地基处理方式对软土地基变形的影响的研究,结果表明:地基变形速率大不一定代表地基土体处于危险状态,地基变形速率小也不一定代表土体整体稳定安全,简单的通过地基变形速率对地基稳定性进行判断并不合理,需要综合考虑多种因素进行判断;不同的加载速率对软土地基的变形速率有着显著影响,等速加载和不等速加载方式不宜采用相同变形速率控制指标,在实际工程中应综合考虑土体特性及工程情况进行分析;不同的地基处理方式对软土地基的稳定性有重要影响,地基的排水性能好,能显著提升软土地基的稳定性;排水地基和不排水地基的稳定性也不宜采用单一的变形速率控制指标进行评定。研究成果可以为软土地基堆载工程监测提供科学依据。

Soft soil foundation is often encountered in the process of highway construction , and the stability of the soft soil foundation directly determines the safety of the highway. Combined with the actual project , it carries out research on stability of soft soil foundation under different loading rate andfoundation treatment. The results showed that the rate does not necessarily represent the soii in a danger-ous state deformation of foundation , foundation deformation rate does not necessarily mean bility of soil , simply by foundation deformation rate on the stability of foundation of judgment is not rea-sonable and the need to consider a variety of factors to judge; have a significant impact at different rates of loading rate on the deformation of soft soil foundation , not the constant loading speed and different speed loading modes with the same deformation rate control index in the actual project should be analyzed considering the soil characteristics and engineering; have an important impactreatment in different ways on the soft soil foundation , foundation drainage performance is good , can sig-nificantly enhance the stability of soft soil foundation The stability of the drained and undrained founda-tions should not be evaluated by a single deformation rate control index.a scientific basis for the monitoring of soft soil pile construction.