Rapid retest device and test method for shear wave velocity of site formation

Abstract

The invention relates to a site stratum shear wave velocity quick retesting device and method to reduce testing time and uncertainty in testing and improve testing accuracy. According to the technical scheme of the site stratum shear wave velocity quick retesting device, the site stratum shear wave velocity quick retesting device is characterized by comprising a first vibration source generator, a first wave detector, a second wave detector, a second vibration source generator and a computer, wherein the first vibration source generator and the first wave detector are integrally connected side by side, the second wave detector and the second vibration source generator are integrally connected side by side and correspond to the first vibration source generator and the first wave detector respectively, and the computer is connected with the first vibration source generator, the first wave detector, the second wave detector and the second vibration source generator through signal lines. The site stratum shear wave velocity quick retesting device and method is applicable to the technical field of in-situ surveys, particularly to the technical field of in-situ surveys of shear wave velocity.

Description

technical field [0001] The invention relates to a fast retesting device and method for shear wave velocity of formations in construction engineering sites, which are mainly applicable to the technical field of in-situ survey of civil engineering construction sites, especially the technical field of in-situ testing of shear wave velocity. Background technique [0002] The shear wave velocity test of the formation of the construction project site is widely used in engineering. The shear wave velocity value is an important parameter in geotechnical disaster reduction and disaster prevention engineering, such as the calculation of physical and mechanical parameters of rock and soil, the classification of soft and hard types of stratum soil, and the overburden layer. Thickness determination, site earthquake category classification, site foundation excellence period calculation, and site soil seismic liquefaction determination are all required. [0003] At present, the conventiona...

AI Technical Summary

Problems solved by technology

[0004] However, if the distribution of strata on the site is uneven, and some strata have interlayers and interbeds, the conventional method will be insufficient to quickly identify the strata of the site, and the single test value is often discrete. If you want to improve the test If the accuracy is high, repeated tests in the same borehole or a large number of tests in different boreholes should be carried out to obtain the test statistics; at the same time, specific operating procedures should be followed for the site shear wave velocity test. From the bottom to the hole, it is carried out from bottom to top. At each test depth, the test should be repeated several times, and the average value of the test should be taken; in addition, when a hole-forming test is used, after the test work is completed, some test points should be selected for testing. Repeat the test, the number of which should not be less than 10% of the total number of test points, and the exchange of the vibration source hole and the receiving hole can also be used for detection; the recorded waveform should be identified and judged in time on the spot to determine whether it is available, if it is unqualified, It should be redone immediately on site; in addition, if it is found that the waveform recorded by the receiver is incomplete or cannot be interpreted, it must be redone until it is normal

[0005] Therefore, when the above situation is encountered, the conventional single test method will inevitably lead to repeated workload, and at the same time, it will also face the problem of long-term stability of the borehole wall, such as repeated tests or inspections. hole phenomenon, it is necessary to drill another hole for testing, resulting in waste of manpower, time and economic costs

Images