Measurement device and method of subgrade coefficient of soil body

Abstract

The invention discloses a measurement device and method of a subgrade coefficient of a soil body. The device comprises a bracket (1), wherein the bracket (1) is equipped with a hoisting rod (2); a bottom plate (3) is fixed on the hoisting rod (2); a sleeve (4) is mounted on the bottom plate (3); the bracket (1) is further connected with a pressing rod (6) through a pressure sensor (5); a concave annular groove (8) is formed in an inner wall of the sleeve (4); a rubber barrel (9) with upper and lower openings is arranged in the sleeve (4); a water inlet pipe (10) and a water outlet pipe (11) penetrate through a side wall of the sleeve (4); a displacement sensor (13) is fixed at the upper end of the sleeve (4); a central hole of a limiting ring plate (21) is internally matched with a pressing cover (14). The key of the method disclosed by the invention is that a standard sampling point is revised on a curve so as to make up interferences of early-period consolidation stress. The device and the method have an accurate measured result.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a measuring device and a measuring method for the soil subgrade coefficient. Background technique [0002] Sustainable development is my country's basic national policy, mainly reflected in energy conservation, environmental protection, low carbon and innovation. For urban construction, the scientific, reasonable and full development and utilization of underground space is a very important measure. In order to achieve the safe, economical and effective development and utilization of underground space, it is very important for engineering geological exploration to provide accurate geological data. Among them, the subgrade coefficient, one of the mechanical performance indicators of the formation, is a very important parameter in the design of underground space development and utilization. and basis. [0003] The subgrade coefficient is the ratio of the stress on the foundat...

AI Technical Summary

Problems solved by technology

However, after the soil sample is sampled from the soil layer, the phenomenon of pressure release and deformation springback will appear, that is, this part of the pre-consolidation stress has been released, and the establishment of the coordinate origin and the selection of the standard sampling point in the above two methods are different. It is not taken into account to compensate for this pre-consolidation stress, so the final collection of ⊿S is naturally inaccurate, which leads to the final obtained standard bed coefficient K 1.25mm not accurate

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