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一、成都粘土的钙质结核(简称钙核) (一)成都粘土:现以成都东郊乌龟侨自上而下的剖面简介如下(见图1)。 1.棕黄色牯土:密宽、硬塑状、细腻,孔隙率为36—45％,含钙质结核,局部含深褐色鲕状、豆状铁锰结核,一般含铁锰结核时不含钙核。垂直和高倾角的斜裂隙发育,裂隙宽0.5—5厘米,充填灰白色粘土,裂隙面有铁锰质薄膜,厚1—1.5米。 2.棕黄微暗红色粘土:与上层岩性结构基本相同,但不含钙核。上部有2—5条裂隙水平或50—60°倾角,厚7—15.5
First, Chengdu clay calcareous nodules (referred to as calcium) (a) Chengdu clay: now in Chengdu eastern suburbs of turtle overseas profile is as follows (see Figure 1). 1. Brownish yellow soil: dense, hard plastic shape, delicate, porosity of 36-45%, with calcium-containing tuberculosis, local dark brown oolitic, bean-shaped ferromanganese nodules, iron-manganese nodules are generally not Calcium. Vertical and high inclined diagonal cracks develop, cracks 0.5-5 cm wide, filled with white clay, fissure surface ferromanganese film, 1-1.5 meters thick. Brownish dark red clay: with the upper lithological structure is basically the same, but does not contain calcium. There are 2-5 fractures in the upper level or dip angle of 50-60 °, thickness 7-15.5