Cone penetrometer for evaluating penetration property of unsaturated soil

Abstract

The invention relates to a cone penetrometer for evaluating penetration property of unsaturated soil. The cone penetrometer adopts a coaxial cable (1) to transmit signals and data, a water reservoir (2) and a water delivery pipe (3) provide water sources required in testing, and an analog converter (4) and a clinometer (5) are arranged on the upper portion of a probe. A first porous stainless steel filter ring (6.1), a second porous stainless steel filter ring (6.2) and a third porous stainless steel filter ring (6.3) are arranged in the middle of the probe. Two pressure sensors (7.1 and 7.2) are respectively mounted in the first porous stainless steel filter ring (6.1) and the second porous stainless steel filter ring (6.2). A side-wall friction barrel (8), a hole water pressure sensor (9), a hole pressure filter ring (10) and a cone probe (11) are arranged on the lower portion of the probe. The cone penetrometer for evaluating penetration property of the unsaturated soil has the advantages of convenience, fastness, accuracy, high repeatability, good quality control and the like and provides a powerful testing tool for evaluation of contaminated sites and reconnaissance and practice of geotechnical engineering.

Description

technical field [0001] The invention relates to a new method for measuring the permeability characteristics of unsaturated soil, which belongs to a multi-functional pore pressure static penetrating device capable of evaluating the permeability characteristics of unsaturated soil in situ in the field of geotechnical engineering and environmental geotechnical engineering testing. Background technique [0002] Static CPT refers to using a pressure device to press a penetrating rod with a contact probe into the test soil layer, and to test the penetration resistance and side wall friction resistance of the soil through the measurement system, so as to determine some basic physical and mechanical properties of the soil. , such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc. The static penetration technology has a history of more than 80 years. Static CPT is widely used in the world, partially or completely replacing drilling and sampling ...

AI Technical Summary

Problems solved by technology

The indoor test method relies on sampling technology, so it is affected by sampling disturbance and size effect, and the reliability of the permeability characteristics given is not strong, and for polluted soil, it is necessary to prevent secondary pollution during the test process

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