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采用在三轴压力室上改造的物理模型实验室,针对防渗墙墙端与土相互作用的特点,进行了不同上覆压力存在条件下模型墙与土的刺入物理模型试验研究。研究结果表明:不同上覆压力下,墙端阻力随刺入变形呈现较大的差别;相同刺入量情况下,墙端阻力随上覆压力的增大而增加;在一定的上覆压力下,墙端阻力随刺入变形的增加而增大,但存在一个极限值;墙端阻力对墙周围土体影响范围较小,墙端阻力及刺入变形增加土体竖向变形,墙端土体主要表现为竖向压缩变形,墙端平面以上的土体有斜向下运动的趋势。在此基础上提出了描述墙端阻力-刺入变形曲线的数学表达式。
A physical model laboratory modified on a triaxial pressure chamber was adopted. According to the interaction between the wall of the impervious wall and the soil, physical model tests of the model wall and the soil under different overpressure conditions were carried out. The results show that under different overburden pressures, the wall resistance shows a great difference with the piercing deformation. With the same piercing amount, the wall resistance increases with the increase of overburden pressure. Under certain overburden pressure , The wall resistance increases with the penetration deformation, but there is a limit value; the influence of the wall resistance on the soil around the wall is smaller, the wall resistance and piercing deformation increase the vertical deformation of the soil, The body is mainly manifested as vertical compression deformation, the soil above the plane of the wall end has the tendency to move diagonally downward. Based on this, a mathematical expression describing the resistance of the wall-piercing deformation curve is proposed.