不同地区黄土崩解特性的试验研究

为研究不同黄土的崩解特性,探讨引起黄土崩解性差异的主要因素,对不同地区的黄土进行了室内崩解试验。通过对比各自的崩解形态、崩解时间、崩解程度等,发现粉土的崩解形态主要是散粒状;粉质黏土的崩解形态既有散粒状又有碎块状;粉土的崩解性明显强于粉质黏土,崩解更迅速彻底,持续的时间更短。根据试验数据绘制成崩解曲线,得到崩解率、崩解速率等指标。结合黄土的基本性质,对黄土的崩解特性进行分析,发现造成黄土崩解性差异的主要因素有颗粒级配、含水率、矿物成分等。其中,颗粒成分、矿物成分是造成粉土与黏性土崩解差异的主要因素。黏粒及黏土矿物等含量越多,崩解性越弱;黏粒含量越高,崩解形态越趋向块状;而含水率增加,黄土的崩解性减弱,且含水率对粉土崩解性的影响远小于粉质黏土。

Experimental Study on Disintegration of Loess in Different Regions

To study the disintegration characteristics of different loess and explore some critical factors which causing the difference in disintegration, we had finished series of disintegration experiments of loess in different regions. Comparing these disintegaration form, velocity, rate, and so on. then found that silt have granular form, while the silty clay mainly have granular and fragment form. The disintegration of silt are stronger than silty clay, it disintegrate quickly and fully, and only take a shorter time. Using these experimental data to draw the curve of disintegration, then got some indicators like disintegration velocity, disintegration rate, and so on. Combine the basic properties of loess to analyse the disintegration characteristics of different loess. The result show that the disintegration was related to grain composition, moisture content, mineral composition, and so on. The grain composition and mineral component are main factors which made great difference between silt and silty clay, the more clay particles and clay minerals content, the weaker for disintegration of loess, and the disintegration form approach block. While increasing the moisture content, the disintegration be weak deeply, but the impact cuased by the moisture content to silt"s disintegration are smaller than silty clay.