Bentonite slurry lubricated penetration rod used for piezocone penetration test

Abstract

The invention discloses a bentonite slurry lubricated penetration rod used for a piezocone penetration test. The upper part, above the ground, of the penetration rod (3) is provided with a penetration system (2), and the penetration system (2) is connected with a bentonite grouting machine (1); the lower part of the penetration rod (3) is provided with a resistance reducer (5); a first liquid outlet (4-1) and a second liquid outlet (4-2) are respectively formed in both sides of the resistance reducer (5); the middle of the penetration rod (3) is hollow, so that slurry injected by the bentonite grouting machine (1) is injected from the upper part of the penetration rod (3), outflows from the lower part of the penetration rod (3) through the first liquid outlet (4-1) and the second liquid outlet (4-2) in both sides of the resistance reducer (5), and fills a gap between the penetration rod (3) and a soil body. The bentonite slurry lubricated penetration rod has the characteristics of being small in penetration resistance, big in penetration depth, jam-proof, high in precision, suitable for various soil layers, and the like; by adopting the bentonite slurry lubricated penetration rod, the problems that the penetration and the pullout of the penetration rod are difficult and the like during the piezocone penetration test can be effectively solved; the efficiency of the piezocone penetration test is obviously improved; the test time is shortened, and the test cost is reduced.

Description

technical field [0001] The invention relates to a bentonite slurry lubricated probe rod which can be used for pore pressure static penetration testing, and belongs to penetration equipment for pore pressure static penetration testing in the field of geotechnical engineering. Background technique [0002] Static CPT technology refers to using a pressure device to press a penetrating rod with a probe into the test soil layer, and through the measurement system to test the cone tip resistance and side wall friction resistance of the soil, some basic physical properties of the soil can be determined. Mechanical properties, such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc. [0003] During piezostatic penetration testing, the friction between the soil and the penetrating probe limits the maximum penetration depth of piezostatic penetration testing. Usually in the soil, the friction between the probe rod and the surrounding soil increase...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The technical problem to be solved by the present invention is to invent a new method for pore pressure static penetration testing in view of the problems of penetration and extraction of the probe rod in the current large-depth pore pressure static penetration test in China. Tested bentonite slurry lubricated probe

Images