非饱和土受荷后的单向初期变形和固结变形

为建立一维非饱和土固结简化计算方法,首先将非饱和土的固结过程分为初期压密、气压消散和水压消散3个阶段并假定初期压密和气压消散这2个过程是瞬时完成的,然后再单独考虑水压的消散过程.实例模拟结果表明:简化方法能基本反映饱和度不太高的非饱和土的固结过程;饱和度超过85%时,气压消散存在一个较长的历时过程,简化计算方法不宜采用.

One-dimensional deformation at initial stage and consolidation deformation of unsaturated soil under loading

The study was performed to establish a simplified method for calculation of one-dimensional consolidation deformation of unsaturated soil.At first,the consolidation process of unsaturated soil was divided into three stages,i.e. compaction at initial stage,air pressure dissipation,and water pressure dissipation,and it was assumed that the compaction at initial stage and air pressure dissipation were completed instantaneously.Then,the process of water pressure dissipation was studied separately.Case study shows that the simplified method can reflect the consolidation process of unsaturated soil with relatively low degree of saturation,and that it was not suitable for reflecting the consolidation process of unsaturated soil at the degree of saturation over 85% due to the fact that the air pressure dissipation lasts a long period of time.