The invention discloses a sampling method for the original sample of large-scale fully weathered red
bed sandstone, which comprises the following steps: manually excavating to the designed sampling depth at the selected intended sampling position; determining the set
lithology and
weathering type; expand the working face around the proposed sampling location; scrape the sandstone sample into a rock pillar with the inner
diameter of the hard circular
pipe used for sampling; put the half-separated hard circular
pipe on the rock pillar, and use fine particles to fill the gap Fill it up, then fix it;
cut off the bottom of the rock pillar, scrape the top and bottom of the rock pillar, and then fix the steel plate on the top and bottom of the rock pillar; wrap the hard circular tube and steel plate with dense gauze, Then fix it, apply
liquid paraffin on the emery cloth; wrap it with
plastic film, fix it and put it into the box, fill the space around it tightly with broken foam blocks to the top of the box, cover the top plate of the box; transport it to the laboratory. The sampling method of the invention has the advantages of simple operation, little disturbance, good
impact resistance, low cost and easy transportation.