砂土液化的地质综合判别法

THE GEOLOGIC-SYNTHETIC DISCRIMINATORY METHOD ABOUT SAND LIQUEFACTION

本文根据地震烈度七、八、九度区的实际资料,分别建立了包括砂土厚度、砂土密实度、砂土埋深及地下水位埋深等四项因素的藏化判别式和严重液化与轻微液化的判别式。根据对唐山、海城地震区131个钻孔162组资料的统计结果,本判别法的有效率为:七度区91％,八度区88％,九度区95％。

Sand liquifaction process occurs when a saturated sand body undergoes shearing stress. In case when the fundamental conditions for liquifaction are satisfied, the sand thickhess and density are two leading factors controlling the deformation quantity. This paper, according to the actual of seismic intensity 7°, 8° and9° zone establish separately the liquifaction djscriminant and the serious liquifaction and light liquifaction discriminant inclusive of the factors of sand thickness, sand density, and burial depths of sand and groundwater table. According to the statistics of 162 data groups from 131 drill holes in the Tangshan earthquake and Haicheng earthquake zones, the effective rate of this discriminatory method are 91 per cent in 7° zone, 88 per cent in 8° zoue, and 95 per cent in 9° zone respectively.