预压地基中止加固的综合判定

Comprehensive determination method of preloading discontinued on soft foundation

摘要: 首先阐明了软基等载与超载预压的概念及工后沉降的组成,然后从土力学压缩与固结的基本原理出发,推导出能考虑等载、超载与固结度对工后沉降影响的工后主固结沉降计算式,通过预压类型系数Φ和固结度Ut把单纯考虑等载、超载工况及加固时间影响的工后主固结沉降各计算式统一于该式.式中的最终沉降量、沉降速率和β值都通过实测沉降曲线或沉降速率曲线求得,各参数间满足时间相一致的原则.利用该式对两个工程实例进行了推算,推算结果接近于实际观测值.

Abstract: This paper puts forward a new calculation method of post-construction settlement for improving soft foundation by preloading.The author first clarifies the definition of preloading soft foundation by equivalent embankment weight load and over load,and the composition of post-construction settlement,and then derives the calculation formula on post-construction primary consolidation settlement from the basic principle of soil mechanics on compression and consolidation.Considering equivalent weight load,over l...