Shear strength testing device and shear strength and static cone penetration testing method thereof

Abstract

The invention discloses a shear strength testing device and a shear strength and static cone penetration testing method thereof. The shear strength testing device comprises a base, a penetration system, a rotating system and a measuring system, wherein the penetration system is arranged on the base; the rotating system is connected with the penetration system, and the measuring system is connectedwith the rotating system. The measuring system comprises a probe rod, one end of which is connected with the rotating system, and the other end of which is connected with the conical head, and a conical head, which comprises a first conical head and a second conical head which are connected to the probe rod in a replaceable manner; an annular pressure gauge is arranged on the middle circumferenceof the first conical head; the fan-shaped conical plates of the second cone head are uniformly and vertically arranged on the circumference of the cone head body. The invention has the advantages that the data of the cohesion force and the friction angle of the soil body on the spot can be quickly and conveniently obtained; the problems that the traditional cross plate shearing test can only be used for measuring the soft soil layer and the cohesive force and has narrow application range are effectively solved; and the device is simple in structure, small in volume and convenient to carry anduse.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a shear strength testing device and a shear strength and static penetration testing method thereof. Background technique [0002] At present, the investment in road slope disease control projects is huge, and the evaluation of the effect of the slope control measures of the completed projects is only carried out in accordance with the current industry norms for completion acceptance. After entering into operation, there are very few studies on whether the management and protection measures are "suitable to the case", whether they have achieved the expected effect, and whether the management effect is good or bad. Ecological slope protection is an emerging technology. There are no mature design, construction and quantitative evaluation standards for slope protection effects at home and abroad. With the expansion of the application scale of ecological engineering s...

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Problems solved by technology

Ecological slope protection is an emerging technology. There are no mature design, construction and quantitative evaluation standards for slope protection effects at home and abroad. With the expansion of the application scale of ecological engineering slope protection, the problems encountered will become more and more complicated. Only relying on some construction experience often It is difficult to solve these problems; for example: the problem of the amount of reinforcement materials, too little will cause the instability of the slope; too large will cause waste and not economical

[0003] In existing geotechnical engineering, the shear strength of the soil is generally used to evaluate the bearing capacity of the soil or the ability to resist landslides, such as the cohesion and internal friction angle of the soil; currently, it is suitable for in-situ penetration Test (penetration test such as cone dynamic penetration test) or load test can only obtain the normal stress strength data of the soil, but cannot obtain the shear strength of the soil; A simple and reliable in-situ test method for strength, but it is only suitable for the clay layer in coastal saturated soft soil areas, and can only measure the cohesion c of the soil, but cannot measure the internal friction angle of the soil value, with a limited range of

[0004] At present, there is no suitable geotechnical engineering exploration equipment in China, which can quickly and conveniently obtain the cohesion c of the soil and the friction angle in the soil Therefore, it is an urgent problem to find a simple and reliable in-situ measurement of soil shear strength equipment.

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