Pore pressure cross plate device capable of evaluating sand liquefaction potentiality

Abstract

The invention discloses a pore pressure cross plate device capable of evaluating sand liquefaction potentiality continuously and qualitatively. The upper part of the pore pressure cross plate device is provided with an upper thread circular tube (32) and the lower part of the pore pressure cross plate device is provided with a lower thread circular tube (31), the lower part of the upper thread circular tube (32) is connected with the lower thread circular tube (31), a pore water pressure sensor (2) is arranged in the upper thread circular tube (32) and a shaft rod (4), the upper part of the pore water pressure sensor (2) is connected with a power supply cable (1), the lower part of the lower thread circular tube (31) is connected with the shaft rod (4), a cross plate head that a pore-free plate head (52) and a porous plate head (51) are mutually vertically arranged is arranged outside the shaft rod (4), water permeating holes (6) are arranged in the middle of the porous plate head (51) along the radial direction of the lower thread circular tube (31), and a waterproof plug (7) is arranged on the bottommost end of the shaft rod (4). The pore pressure cross plate device has the characteristics of normal position, rapidness, accuracy, convenience and the like, and provides a strong detection tool for tailings dam evaluation, sand earthquake-induced liquefaction evaluation and geotechnical engineering foundation treatment practices.

Description

technical field [0001] The invention relates to a pore pressure cross plate device, which belongs to a test device capable of accurately and quantitatively evaluating the liquefaction potential of saturated sandy soil in the field of civil engineering. Background technique [0002] Since Casagrande proposed in 1976 that it is necessary to develop in-situ testing technology for sand liquefaction potential, many testing techniques have been applied in this area, the most common of which are standard penetration test (SPT) and pore pressure static penetration test ( CPT). These two tests mainly evaluate the liquefaction potential of sandy soil based on experience, which makes the test technology have great limitations. At present, the dilation / shrinkage trend and steady-state shear strength of sandy soil are mainly obtained through laboratory tests and related field test indicators. The measurement of in-situ pore water pressure in the soil layer is helpful to evaluate the li...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The technical problem to be solved in the present invention is to propose a method that can be used in the field of geotechnical engineering to quantitatively evaluate the liquefaction potential of saturated sand in situ, aiming at the in-situ quantitative evaluation of saturated sand liquefaction potential that cannot be carried out in China at present. Hole pressure cross plate device

Images