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为了研究新型上拔式静力触探拉拔阻力的变化规律,自主开发了大型模型箱试验装置,并以黏土和砂土为研究对象,在室内模拟其拉拔过程。该试验主要对不同刃口角度、刃口长度、拉拔速率、压实度、相对密度等因素对拉拔阻力的影响进行研究。研究结果表明:上拔阻力变化曲线大致分为急速上升阶段、缓慢上升阶段和稳定阶段3个阶段;拉拔阻力随着刃口角度的增加而增大;前期拉拔阻力增加速率与最大拉拔力均随着刃口长度的增加而增大;随着拉拔速率的增长,拉拔阻力在逐渐增大;随着压实度的增加,最大拉拔阻力也逐渐增加,但二者并未表现出明显的线性关系;随着相对密度的增加,拉拔试验得到的最大拉拔阻力逐渐增加。在相对密度较低时,拉拔阻力增加缓慢,相对密度较高时,拉拔阻力增加迅速。
In order to study the variation law of drawing resistance of the new uplift type static probe, a large model box test device was independently developed. Clay and sand were taken as the research object to simulate the drawing process indoors. The experiment mainly studied the influence of different blade angle, cutting edge length, drawing speed, compaction, relative density and other factors on the drawing resistance. The results show that the variation curve of ascending resistance can be divided into three stages: rapid rising phase, slow rising phase and steady phase. The drawing resistance increases with the increase of cutting edge angle. The force increases with the increase of cutting edge length; the drawing resistance increases with the increase of drawing speed; the maximum drawing resistance gradually increases with the increase of compaction degree, but the two are not Showing a significant linear relationship; With the relative density increases, the maximum drawing resistance pull test increased gradually. In the relative density is low, the drawing resistance increases slowly, the relative density is higher, the drawing resistance increases rapidly.