真空预压中真空度与孔隙水压力的关系分析.pdfVIP

第26 卷第12 期 岩 土 力 学 Vol.26 No.12 2005 年12 月 Rock and Soil Mechanics Dec. 2005 文章编号：1000－7598 －(2005) 12 ―1949―04 真空预压中真空度与孔隙水压力的关系分析 1, 2 1 2 3 张功新 ，莫海鸿 ，董志良 ，赵建国 （1. 华南理工大学 土木工程系，广州 510640 ； 2. 广州四航工程技术研究院，广州 510230 ；3. 建材广州地质工程勘察院，广州 510403 ） 摘 要：真空度与孔隙水压力是两个不同的概念，在土体中某点真空表测试的真空度与测点处的孔压差并不相同，但它们有 着内在的联系。根据气体状态方程和平衡方程，推导出在某点真空表反映的真空度值与孔压计反映的孔压差的理论关系式。 测点在地下水位以上时，两者的测试结果是一致的；测点在地下水位以下时，真空度小于孔压差，两者可按公式进行换算。 测试结果表明：现场实测结果与理论计算结果基本吻合，证实了理论推导的正确性，也说明了真空表内真空度与孔隙水压力 的关系。 关 键 词：真空表；孔压计；真空预压；真空度；孔隙水压力 中图分类号：TU 432 文献标识码：A Analysis of relationship between vacuity and pore-water pressure in vacuum preloading ZHANG Gong-xin 1,2 1 2 3 , MO Hai-hong , DONG Zhi-liang , ZHAO Jian-guo (1. Department of Civil Engineering, South China University of Technology, Guangzhou 510640, China; 2. Guangzhou Sihang Institute of Engeering Technology, Guangzhou 510230, China; 3. Guangzhou Geotechnical Investigation Institute of Building Material, Guangzhou 510403, China) Abstract: Vacuity and pore-water pressure are two different conceptions, the vacuity measured by vacuum meter in the soft soil is different from the difference of pore-water pressure measured by piezometer; but there is an immanent relation between them. The theoretical formula about vacuity in vacuum tube and pore-water pressure at the observation point was obtained in this paper by using equation of gas state and equilibrium equation. When the observation point is above the groundwater surface, the vacuity is the same as the difference of pore-water pressure. When the observation point is under the groundwater surface, the vacuity is