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干处理，检测其物理、化学和力学性质的变化：(1)液限、塑限和持水率随循环频率的增加而降低。(2)团聚体和土壤颗粒的形状可以用分维来表示，农户的分维在1.1左右，农民的分维在2.0左右。(3)强度较高的粘土矿物HT(7A)、Vt、Vt-CH不变，但对水的亲和力下降。(4)随着循环次数的增加，最佳含水率下降，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5~10个周期之间。(6)崩解花岗岩发生异常变化的情况。2.对不同围岩、滑坡范围的路堑边坡深采土的物理、化学和力学性质进行了测试，包括变质岩、植被和发育年限。结果表明，路堑边坡距表层约5~10 cm，滑坡区距表层约4m处有硬风化层。

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.