The invention discloses a
low back pressure saturation method for
loess liquidation experiment. The method comprises the following steps: preparing an original or remolded
loess test sample; mounting an experiment device; checking the experiment device; preheating the experiment device for more than 20 minutes; mounting the
test sample; charging water into a pressure chamber, subsequently adjusting the confining pressure and the
back pressure to be zero, zeroing the
pore water pressure and the
volume change, and finally adjusting the initial shaft pressure to be zero; initializing the confining pressure and the
back pressure, and after the confining pressure and the
back pressure are stabilized, gradually exerting the confining pressure and the back pressure in sequence step by step. The method adopts the
loess test sample which is saturated by using a
low back pressure saturation method, the saturability is greater than about 95%, the reproducibility of the experiment is remarkably improved when being compared with that of water head saturation, the analysis on the original loess
micro structure before and after the back pressure saturation shows that the
horizontal and vertical structure of the test sample is generally complete when the
low back pressure saturation method is adopted, the result shows that under the low back pressure condition, the saturability can be improved by using the method, the structure of the test sample is not damaged, and the method has the characteristics of high saturability, relatively high control precision and the like.