摘要
按照在渗流作用下无粘性土颗粒移动的难易程度,可将其颗粒分为骨架颗粒、阻塞颗粒和可动颗粒三类。如果土体中存在较多的可动颗粒,该土体就可能发生管涌。据此,提出一个判定土体是否可能发生管涌的新方法,可以同时考虑土体的颗粒级配和密实度的影响。通过关管涌实验,证实了该方法的有效性。在此基础上,进一步探讨了土体的密实度对骨架孔隙的最小孔径、界限粒径、可动颗粒含量和阻塞颗粒含量的影响。
The grains of noncohesive soils are classified into three groups: skeleton, movable and clogging based on their movability under seepage. If there are some movable grains in a noncohesive soil, piping is easy to take place. In consideration of the grain-size distribution and the degree of densification of soils, a new method for assessing the piping-typed soil is suggested; and its application to some piping tests illustrates its validity. The calculated results show that the degree of densification has influence on the minimum pore diameter, the fractile diameter, the content of movable grains and that of clogging ones.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第7期1072-1076,共5页
Rock and Soil Mechanics
基金
郑州大学青年骨干教师资助基金项目
