Change of engineering properties and soil structure in cohesive soils varied country rocks with weathering

1.对三种不同围岩的粘性土进行反复冻结干燥处理，研究其物理、化学和力学性质的变化。(1)液限、塑限和保水性随循环次数的增加而降低。(2)团聚体和土壤颗粒的形状可以用分形维数来表示，农户的分形维数约为1.1，土壤颗粒的分形维数约为2.0。(3)这几种粘土矿物的HT（7A）、Vt、Vt-Ch强度高，没有变化，但性质上亲水性下降。(4)随着循环次数的增加，最佳含水率降低，最大干密度和无侧限抗压强度增加。(5)这些变化大多发生在5到10个周期之间。(6)2.对不同围岩、不同滑坡区、不同植被、不同发育年限的路堑边坡土壤的物理、化学、力学性质进行了研究。结果表明，在路堑边坡上距表层5- 10 cm处，滑坡区距表层4 m处，均存在硬风化层。

1.We treated three kinds of cohosive soils having different country rock with repeated immorssing freezing and drying, and examined changes in physical, chemical and mechanical propertics.(1) Liquid limit, plastic limit and water retentivity fall with increase in cycle freguency. (2) The shape of aggregate and soil particle can be indicated on fractal dimension, and the farmer is about 1.1 and the latter is about 2.0. (3) These kinds of HT(7A), Vt, Vt-Ch which are clay minerals shown high intensity do not change, but in quality a affinity for water fall down. (4) With the increase of cycle frequency, optimum moisture content fall down, but maximum dry density and unconfined compressive strength increase. (5) Most of these changes occur between 5 to 10 cycle. (6) Ecery case of exceptional changes occurs on decomposed granite.2.We examined physical, chemical and mechanical properties of soils picked by depth from cut slope which have different country rock and land slide area in metamorphic rock, vegetation and the passage of year since development. As a result, there were hard weatbered layers where were about 5-10cm from the surface layer onthe cut slope and about 4m from the surface layer on the land slide area.