Drilling device and hole forming method of pre-drilling type lateral pressure test

Abstract

The invention provides a drilling device of a pre-drilling type lateral pressure test. The drilling device comprises a cutting ring soil miller, a spoon-type drill, a drill bit, a locator, drilling rods, outer rods, a connecting rod and a baffle. A hole forming method for carrying out the pre-drilling type lateral pressure test through the device comprises the steps that 1, an instrument is assembled, wherein the drill bit and the wall of the spoon-type drill are connected, the wall of the spoon-type drill is connected with the connecting rod, and the connecting rod is connected with the drilling rods; 2, drilling is carried out, wherein drilling is stopped when the locator is in contact with the ground surface, the center of the cutting ring soil miller is aligned to the locator to be vertically pressed into the underground, the baffle is arranged on the corresponding outer rod at the upper end of the cutting ring soil miller, and the cutting ring soil miller is vertically pressed into soil by pressing the baffle through the gravity of a drilling machine or hammering the baffle through a heavy hammer; 3, testing is carried out; and 4, drilling continues to be carried out, and the lateral pressure test of different depths in the same drilled hole is carried out. The device is simple in structure, detachable, convenient to manufacture and maintain, safe, stable, easy to operate, low in manufacturing cost, high in drilling speed and high in hole forming quality, the construction period can be remarkably shortened, and the adverse effect of hole collapse and hole shrinkage to the result of the lateral pressure test is eliminated.

Description

technical field [0001] The invention relates to the technical field of in-situ testing of geotechnical engineering, in particular to a drilling device suitable for forming a hole in a pre-drilling side pressure test, and also relates to a method for forming a hole in a pre-drilling side pressure test. Background technique [0002] In the field of geotechnical engineering, the mechanical properties of rock and soil are mostly obtained through laboratory tests and in-situ tests. Compared with the indoor test, the in-situ test can measure the engineering mechanical properties of the soil in the original position of the soil, basically maintain the natural structure, natural water content and natural stress state, which can avoid stress release and disturbance during the sampling process The influence of the obtained test results is more in line with the actual situation. The side pressure test is to use the side pressure instrument to apply radial pressure to the hole wall of ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art. The present invention provides a drilling device for pre-drilling side pressure test, which can use ring cutters to cut soil and form a round, vertical and complete drilling device during the drilling process. The pre-drilling side pressure test drilling can effectively solve the problem of poor hole quality of the current pre-drilling side pressure, and provide another kind of pre-drilling with simple operation, low cost, small disturbance of the drilling hole wall, and high hole quality. Hole-forming method of type side pressure test, especially to solve the problem of easy-to-collapse holes in sandy soil stratum and easy-to-shrinkage holes in silt soil stratum

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