[Tool]Grain size distribution curve [颗粒级配分布曲线]

Grain size distribution curve of soil [土的颗粒级配分布曲线]。To identify grain size characteristics of soils, grain size distribution curve is developed. First, sieve analysis is conducted. A variety of sieves with different openings are stacked, with the largest opening sieve on the top and smaller on the lower sections. When a relatively large percent passing through the sieve with 0.075mm opening (e.g., more than 10% as a guideline) is obtained from the sieve analysis, a hydrometer analysis is conducted. This program process the raw data from sieve analysis and hydrometer analysis to get the grain size distribution curve and other parameters like D10, D30, D50, D60, Cu and Cc. from 崔济东,崔济东的博客,www.jdcui.com, CJD, JidongCui

土力学有效应力之雨天防滑 [Effective Stress of Soil]

有效应力原理是土力学区别于其他力学的一个重要原理,由太沙基(K. Terzaghi)提出,并经Skempton和Bishop改进而被广泛接受。该原理认为饱和土中的压应力由力学效应不同的两部分组成,一部分为孔隙水压力,这部分应力既不产生可觉察的压缩量,也不产生可观的抗剪强度增量,又叫中和应力,另一部分为有效应力,这部分应力对土体能够产生可觉察的变形影响或使土体的抗剪强度增加。