ずい道工事における風化じゃ紋岩の土質化学的検討
1973 年 13 巻 2 号 p. 65-73
詳細
1973 年 13 巻 2 号 p. 65-73
Excessive earth pressure occasionally causes much damage to tunnel construction in a serpentinite belt. The geochemical research reported herein was conducted to study the cause of such earth pressure. The following results were obtained:
(1) no clay mineral capable of swelling is included and chryaotile and antigolite are the dominant clay minerals, (2) weathered parts of serpentinite are easily sheared and reduced to flow by a little increase of water, (3) the weathered part, in which clay particles are oriented in a certain direction, is easily sheared in this direction.
Finally, it is suggested that the excessive earth pressure in a serpentinite belt is not attributed to “swell of clay minerals” but to “flow of earth induced by shear of the weathered part”.
