Standard penetration test device for partitioning rock weathering degree

Abstract

The invention belongs to the technical field of in-situ test equipment, and relates to a standard penetration test device for partitioning rock weathering degree. A guide rod is embedded into the middle of a piercing hammer; the bottom of the piercing hammer provided with an automatic unhooking device is provided with a hammer cushion; the bottom of the hammer cushion is firmly connected with a penetration sounding rod by adopting a screw thread; the penetration sounding rod is provided with scale lines; a penetrometer which is provided with a cutting edge and has a hollow metal tube structure is firmly connected with the penetration sounding rod through a screw thread; a water outlet hole is formed in the top end of the penetrometer. The standard penetration test device is simple in structure, is convenient to operate, install, test and read, and can be used for directly partitioning the weathering degree of weathered rock, dividing strongly-weathered rock and medium-weathered rock and subdividing strongly-weathered rock into upper, middle and lower subzones.

Description

Technical field: [0001] The invention belongs to the technical field of in-situ test equipment, and relates to a standard penetration test device for classifying the degree of weathering of rocks, which is used for judging the degree of weathering of rocks in weathered rock areas and classifying types, making up for the fact that the existing equipment can only be applied to sandy soil, Insufficient cohesive soil and weathered rock residual soil can directly divide the weathering degree of weathered rocks, and can subdivide the upper, middle and lower three subzones of strongly weathered rocks for relatively hard rocks in strong to moderate weathering. Background technique: [0002] At present, the classification of rock weathering degree mostly adopts the qualitative evaluation method of engineering geology, which is comprehensively analyzed and determined from the aspects of rock structure, color, mineral composition, joint development degree and excavation difficulty, and ...

AI Technical Summary

Problems solved by technology

[0002] At present, the classification of rock weathering degree mostly adopts the qualitative evaluation method of engineering geology, which is comprehensively analyzed and determined from the aspects of rock structure, color, mineral composition, joint development degree and excavation difficulty, and the weathering degree is classified based on these qualitative uncertain judgments With a lot of randomness, especially when there is a gradual relationship between the two weathering grades, it is very difficult to delineate the boundary line in the transition zone. Moreover, the national standard "Code for Geotechnical Engineering Investigation" (GB50021-2001) stipulates that , for granite rocks, standard penetration tests can be used to classify the degree of weathering, N≥50 is strongly weathered; 50>N≥30 is fully weathered; N<30 is residual soil, where N is the impact However, for the classification of strongly weathered to moderately weathered rocks, the standard penetration test is not given, and the existing standard penetration equipment (standard penetrators) cannot adapt to this type of relatively hard weathered rocks.

Images