Environmental piezocone penetration test (CPTU) probe capable of evaluating permeability characteristic of saturated soil in site

Abstract

The invention provides an environmental piezocone penetration test (CPTU) probe capable of evaluating a permeability characteristic of saturated soil in site. The probe comprises an air pressure chamber (1), a water sealing case (2), a cone penetration test probe rod (3), a coupling rod (4), a filtering tank (5), a side wall friction cylinder (6), a pore pressure filtering ring (7) and a corn head (8), wherein the cone penetration test probe rod (3), the coupling rod (4), the filtering tank (5), the side wall friction cylinder (6), the pore pressure filtering ring (7) and the corn head (8) are sequentially connected from top to bottom. The air pressure chamber (1) is provided with an air conveying valve (9), the water sealing case (2) is provided with a water conveying valve (10), the air pressure chamber (1) and the water sealing case (2) are connected through an air conveying pipe (11), the water sealing case (2) is connected with the filtering tank (5) through a water conveying pipe (12), the side wall friction cylinder (6) is provided with an inclinometer (13), a temperature sensor (14) and a pore water pressure sensor (15), and the inclinometer (13), the temperature sensor (14) and the pore water pressure sensor (15) are connected with output cables. The probe is simple in structure, good in quality control, convenient to use, high in detection speed, high in measuring efficiency, accurate and reliable in measurement result and good in repeatability, and is a powerful measuring tool for civil engineering exploration practices.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering testing, in particular to a measuring device for saturated soil seepage characteristics, in particular to an environmental pore pressure static penetrating probe capable of evaluating saturated soil seepage characteristics in situ. Background technique [0002] The static penetration technology has a history of more than 80 years. It refers to the use of a pressure device to press a penetration rod with a contact probe into the test soil layer, and to measure the penetration resistance and side wall friction of the soil through the measurement system. Determine some basic physical and mechanical properties of soil, such as soil deformation modulus, soil allowable bearing capacity, etc. The static penetrating sounding has been widely used in the world, partially or completely replacing the drilling and sampling in the engineering survey. In 1965, our country first successfully developed the...

AI Technical Summary

Problems solved by technology

The indoor test method relies on sampling technology, and is affected by sampling disturbance and size effect, so 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

In addition, the existing static penetration sensors and the existing static detection technology for single and double bridges cannot evaluate the seepage characteristics of underground saturated soil

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