Method for determining the lateral earth pressure based on the multi-functional piezocone penetration test probe

Abstract

Disclosed is a method for determining the lateral earth pressure based on the multi-functional piezocone penetration test (CPTU) probe. The invention relates to a method for determining the lateral earth pressure based on the multi-functional CPTU, wherein a head of the penetration test probe is connected to a probe rod (6); a three-component earthquake detector (5) is arranged at the upper half part of the lower section of the probe, an inclinometer (4) is arranged at the lower part of the three-component earthquake detector (5), a friction cylinder (3) is located at the lower part of the inclinometer (4), a probe (1) is connected to the lower part of the friction cylinder (3), a pore pressure filter ring (2) is located at the junction between the friction cylinder (3) and the probe (1). The lateral pressure coefficient is directly derived by normalization of a measured value of side friction resistance (FS / ) and a predicted value of over consolidation ratio (OCR), and the OCR can be determined by the multi-functional CPTU testing technology in situ, wherein the correlation obtained by normalization of a net tip resistance and the OCR is reliable. The method is characterized by being in situ, fast, accurate, economic and the like.

Description

technical field [0001] The invention relates to a method for measuring the coefficient of soil lateral pressure based on a multifunctional CPTU, which belongs to a new method for measuring the coefficient of soil lateral pressure in the field of civil engineering. Background technique [0002] CPT technology refers to the use of a pressure device to press a penetrating rod with a probe into the test soil layer, and to test the cone tip resistance and side wall friction resistance of the soil through the measurement system, so as to determine a certain value of the soil. Some basic physical and mechanical properties, such as the deformation modulus of soil, the allowable bearing capacity of 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 in engineering investigation. In 1965, our country first successfully developed the electrical measuring type ...

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Problems solved by technology

[0004] Technical problem: the technical problem to be solved in the present invention is to solve various methods for measuring static soil lateral pressure coefficient existing in China.

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