Soil structure and engineering properties of cohesive soils varied country rock and degrees of weathering related to fractal dimension

1.对变质岩和花岗岩两种不同围岩和滑坡区的排水井中按深度采集的土壤进行了物理、化学和力学性质的测试。因此，在距地表约4 m或8 m处存在硬风化层.对一种沉积岩质粘性土进行反复浸泡、冷冻和干燥处理，研究其物理力学性质的变化。(1)在pF1.0 ~ 1.5范围内，循环处理的保水性下降。(2)循环处理使最佳含水率降低，最大干密度、无侧限抗压强度和超过最佳含水率的应力松弛时间增加。(3)循环处理后，土壤团聚体的质量和数量都发生了显著变化.土壤团聚体和土壤颗粒的形状可以用分形维数来表示。

1. We examined physical, chemical and mechanical properties of soils picked by depth from drainage well which have different country rock and land slide area in metamorphic rock and granite. As a result, there were hard weathered Layers where about 4m or 8m from the surface layer.2. We treated a cohesive soil originated in sedimentary rock with repeated immersing, freezing and drying, and examined changes in physical and mechanical properties.(1) Water retentivity between pF1.0 and 1.5 fall with cyclic treatment.(2) With cyclic treatment, optimum moisture content fall down, but maximum dry density, unconfined compressive strength and stress relaxation time over optimum moisture content increase.(3) With cyclic treatment, soil aggregates remarkably change in quality and quantity.3. The shape of soil aggregates and soil particle can be indicated on fractal demension.