加载方式对生物酶水泥复合固化红砂岩土压缩模量的影响研究

Influence of Loading Methods on Compression Modulus of Red Sandstone Soil Solidified with Biological Enzyme and Cement

水泥稳定类混合料的模量测试方法有多种,而掺入生物酶会影响水泥稳定类材料的刚度特性。为了系统分析加载条件对生物酶水泥复合固化红砂岩土压缩模量的影响,该文采用单调加载中间段法、逐级加载卸载顶面法和逐级加载卸载中间段法这3种静态模量试验方法,以及顶面动态模量法和中间段动态模量法,对生物酶水泥复合固化红砂岩土开展了压缩模量试验。试验结果表明:由于加载频率的区别,动态模量试验的荷载速率远高于静态模量试验的荷载速率,影响了动态模量和静态模量的可比性;当荷载水平、荷载速率相当时,逐级加载卸载中间段法回弹模量与单调加载中间段法弹性模量比较接近,而且采用单调加载中间段法更容易获得代表模量。

There are various methods to test the modulus of cement-stabilized mixtures.The stiffness performance of cement-stabilized materials will be affected after adding biological enzymes.In order to systematically analyze the influence of loading conditions on the compression modulus of the red sandstone soil solidified with biological enzyme and cement,compressive modulus tests were conducted on the red sandstone soil solidified with biological enzyme and cement by using three static modulus test methods including monotonic loading method of middle section,stepwise loading and unloading method of top surface,and stepwise loading and unloading method of middle section,as well as dynamic modulus method of top surface and dynamic modulus method of middle section.The experimental results show that the load rate of dynamic modulus tests is much higher than that of static modulus tests due to the difference in loading frequency,which affects the comparability between dynamic modulus and static modulus.When the load level and load rate are equivalent,the resilience modulus of the stepwise loading and unloading method of middle section is relatively close to the elastic modulus of the monotonic loading method of middle section.Moreover,the monotonic loading method of middle section makes it easier to obtain representative moduli.