The Stability Study Of Soft Soil Foundation Under Multi-stage Preloading

The stability analysis is a key job of earth banks and dykes ,of which stability is regarded as the control condition of engineering design, particularly in the soft land area. Because the stability problems of dams appears primarily during the period of construction, especially the foundation that have been treated. This paper presents some theoretical solutions through study on stability analysis of the dam that is under multi-stage preloading in some sedimentation areas of lake facies.Firstly ,this paper overviews purpose, meaning and present stability research of soft foundation ,puts forward the investigative and main contents in this paper, namely stability analysis of the dam that is under multi-stage preloading on soft soil foundation. Secondly, reinforcing mechanism for soft foundation and consolidation degree of the foundation considering multi-stage preloading are illustrated, a few and main factors that affect consolidation are analyzed emphatically. Then, increasing regulation of anti-shearing strength of foundation was summarized and discussed, based on which the whole stability analysis method considering anti-shearing strength of natural foundation increasing with depth and variation of anti-shearing strength of foundation with consolidation and depth is discussed. Next, exploiting theories of two chapters before, considering the engineering in actual, this paper making sure a plan of loading, dividing into the foundation several areas on end , considering anti- shear strength with the variation of depth of foundation of each cent area ,this paper makes a whole stability analysis of the dam and makes a comparison to the stability result that anti-shearing strength coming from the plan of loading. And next this paper analyzes the measured data and combinatives related norm and engineering experience in order to guiding the construction. Finally, from the calculation and measure analysis, conclusion that the plan is partial to in keep is drived.The research result of this paper can get a certain meaning for guiding the further excellent turning the design, reasonably arrangementing the construction time, guaranteeing the engineering quantity with abbreviating the construction time.