红黏土塑性混凝土防渗墙与覆盖层变形协调及应力变形分析

摘要

利用ABAQUS有限元模拟软件,对云南某黏土斜墙土石坝进行有限元分析,探究坝基中红黏土塑性混凝土防渗墙对覆盖层影响的变化规律.结果表明,在校核洪水位下,0.3、0.4和0.5 m防渗墙的铅垂向位移与覆盖层协调性较好;0.3 m厚防渗墙与覆盖层协调性稍差于0.4、0.5 m厚防渗墙;墙顶垂直应力值为墙底垂直应力值的58%左右,分布较为均匀,有利于墙体的安全;大小主应力值均以压应力为主,其中大主应力值在墙体与基岩连接处出现极小范围的拉力区,但拉应力值远小于抗拉强度0.19 MPa,小主应力最大值为-0.62 MPa,远小于抗压强度值1.69 MPa.%ABAQUS finite element simulation software was used to analyze the finite element analysis of a sloping core earth rock dam in Yunnan,and the influence of the plastic clay in the dam foundation was studied.The results showed that the vertical displacement of 0.3,0.4 and 0.5 m cutoff walls was better than that of the cover layer under the check flood level.The 0.3 m thick cutoff wall and the cover were slightly less than 0.4,0.5 m thick wall;the vertical stress value of the wall top was about 58% of the vertical stress value of the wall,the distribution was more uniform,which was favorable to the safety of the wall.The principal stress values were mainly compressive stress,The tensile stress was much smaller than the tensile strength of 0.19 MPa,and the maximum principal stress was-0.62 MPa,which was much smaller than the compressive strength value of 1.69 MPa.