搭接双开敞状态中的吸力分析

Analysis on Suctions in Overlapping CWCA Unsaturated Soils

基于热力学理论,对非饱和理想模型的水封闭状态、搭接双开敞状态和不搭接双开敞状态的临界条件进行了研究。给出了搭接双开敞状态中的作用面积和张力吸力,得到了基质吸力和等效基质吸力、张力吸力和等效张力吸力随饱和度的变化规律。建议的方法能够反映土的矿物成分对各种吸力和强度的影响。并进一步得到,随饱和度变化,2种等效吸力的变化幅度小于相应吸力的变化幅度等规律。

Based on the ideal ball-particle packing system model for unsaturated soils, the critical saturation angles that define overlapping CWCA state from DWCA state and from non-overlapping CWCA state are determined with numerical methods. Then effective area on particle surface, both for matric suction and tension suction, as well as relation between saturation degree and various types of suctions or corresponding equivalent suctions are established for different contract angles. The proposed method can reflect, on one hand, mineral substance＇ s effect on suctions and strength, and on the other hand, the smaller change of equivalent suctions along with saturation compared with corresponding suctions.