The invention discloses a large raw
loess sampling method. The large raw
loess sampling method comprises the following steps: determining
a site of a to-be-sampled soil, mechanically excavating untilthe height reaches a large cylinder soil pillar, then manually excavating a large cylinder soil pillar to the elevation of the to-be-sampled soil; controlling a horizontal plane on the upper surface of the large cylinder soil pillar, using a large
ring cutter to vertically press downwards, using a soil cutter to press and
cut until the large cylinder soil pillar is higher than the
ring cutter; using a steel
wire saw to
cut through the joint of the large cylinder soil pillar and the ground surface to obtain a soil sample, turning the soil sample, beveling the lower part, using a
preservative film to wrap the whole soil sample together with the large
ring cutter; wrapping with a dense mesh ribbon gauge, evenly brushing a
hot melt wax liquid until the
wax liquid is solidified, marking the upper surface and the lower surface of a soil body;
numbering the soil sample, packaging in a foam box, sealing a paper box with an
adhesive tape, loading on a
truck, and transporting; removing
wax oil,dismounting the gauge, and unscrewing a screw. The method does not change the stress state of the soil body, and disturbance can be avoided. The obtained soil sample meets the requirements of large-size mechanical test on size of the soil sample, the disturbance degree, and the maintenance of the physical
mechanical property.