Large raw loess sampling method

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering and geotechnical testing, and relates to a sampling method, in particular to a large-scale undisturbed loess sampling method, which can take large-sized undisturbed loess samples from the original soil layer in a low disturbance state, and protect and transported to the test site. Background technique [0002] When constructing buildings in loess-like soil areas, the collapsibility of loess-like soils has a great impact on the foundation of buildings and structures. Therefore, how to accurately evaluate the physical and mechanical indicators of loess-like soils in this area is particularly important. Usually, the physical and mechanical indexes of loess are affected by many factors such as different testing methods, sampling methods, test methods, instrument precision, etc. Among them, the use of different sampling methods is the key factor affecting the accuracy of its physical a...

AI Technical Summary

Problems solved by technology

The soil samples obtained by this method are acceptable for moisture content, density tests and small-scale mechanical tests, but cannot meet the requirements of large-scale mechanical tests for soil sample size, disturbance degree, and physical and mechanical properties.

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