天津海积软土结合水固结分析

当前近代海积软土工程沉降分析仍以传统的太沙基单向渗透固结理论为基础。而海积软土有其特殊工程地质性质 ,如 :高孔隙比、高含水量、高压缩性、低渗透性 ,计算结果很难与实际情况相符合。本文从微观角度入手 ,根据压汞和SEM资料分析影响软土固结的本质因素 ;最后借助单向压缩实验 ,对比理论固结曲线与试验压缩曲线 ,分析产生偏差的原因 ,阐述了海积软土固结机制 ,提出结合水固结新概念。

ANALYSIS ON THE BOUND WATER CONSOLIDATION OF MARINE SOFT SOIL IN TIANJIN

Engineering analysis of recent marine soft soil settlement is based on a traditional one-dimensional drainage consolidation theory of Terzaghi.K. Because of specific engineering-geological properties of the marine soft soil, i. e. high porosity ratio, high water content, high compressibility, and low permeability, the result of calculation is not consistent with actual situation. In this paper, on basis of analysis of SEM data and pressure mercury test, the authors analyze the essential factors of affecting the soft soil consolidation. At last, by means of one-dimensional compression test, the authors compare the theoretical curve of consolidation with the test curve of compression, analyze the causes for deviation of two curves, set forth the mechanism for consolidation of marine soft soil, and put forward a new concept of bound water consolidation.