柔性基础下碎石桩加筋复合地基沉降分析方法

碎石桩加筋复合地基是一种新型的软土地基处理方法.在深入研究柔性基础下碎石桩加筋复合地基变形力学机理的基础上,首先,依据碎石桩与桩周土相对滑移量的不同,将碎石桩加筋复合地基加固区区分为加筋区,非加筋塑性区和非加筋弹性区,从而建立出柔性基础下碎石桩加筋复合地基沉降分析模型;然后,根据碎石桩加筋复合地基不同分区的变形力学机理,分别建立出相应的压缩变形分析方法,从而建立出了柔性基础下碎石桩加筋复合地基沉降分析新方法,该方法不仅能反映柔性基础下碎石桩加筋复合地基桩土滑移的特征,而且能反映非加筋弹性区碎石桩侧向鼓胀对沉降分析的影响;最后,通过工程实例计算以及与现有相关沉降分析方法的比较分析,表明了该方法的可行性与合理性.

Method for analyzing settlement of reinforced-gravel-pile composite ground under flexible foundation

The reinforced-gravel-pile composite ground is a new method for treating soft soil ground. Based on the in-depth studies on the deformation mechanism for reinforced-gravel-pile composite ground under flexible foundation, firstly, according to different relative slips between the gravel piles and the soil around them, the reinforced area can be divided into reinforced-gravel-pile zone, unreinforced-gravel-pile plastic zone and unreinforced-gravel-pile elastic zone. A model for analyzing the settlement of the reinforced-gravel-pile ground under flexible foundation is established. Afterwards, according to different deformation mechanisms in different zones, the corresponding deformation analysis methods for various zones are established. Consequently, a new settlement analysis method for the reinforced-gravel-pile composite ground under flexible foundation is developed. The proposed method can consider the influences of relative slip between pile and soil, and reflect the influences derived from the lateral deformation of gravel piles in the unreinforced-gravel-pile elastic zone. Finally, the proposed method is applied to a practical project. Compared with the other existing methods, the proposed method is more feasible and reasonable.