Method and device for layered simultaneous determination and long-term monitoring of foundation compactness

Abstract

The invention particularly discloses a method and a device for layered simultaneous determination and long-term monitoring of foundation compactness, provides the quantitative relationship between resistivity and compactness, as well as between elastic wave velocity and compactness, for the first time through research, and designs a resistivity and wave velocity integrated parallel sensor, a simultaneous determination transmitting and guiding device and a simultaneous determination permanent protection device for field compactness determination and long-term observation. The method can be used for simultaneously determining the resistivity and the elastic wave velocity of a foundation, solves the problems that a single test method is poor in adaptability and undesirable in result through mutual corroboration norm of two methods, realizes layered measurement of different positions of the foundation, as well as long-term monitoring of the foundation compactness in the service period, and solves the problem that a conventional method can realize neither layered compactness testing nor long-term compactness monitoring.

Description

technical field [0001] The invention relates to a layer-by-layer joint measurement device for foundation compaction degree, in particular to a method and a device for layer-by-layer joint measurement and long-term monitoring of foundation compaction degree. Background technique [0002] In various projects such as roadbeds and foundations of highways and municipal roads, the compaction quality of soil is one of the key factors related to the safety of roadbeds and foundations. Compaction greatly increases the strength of soil such as roadbeds and foundations, significantly reduces the plastic deformation of the soil foundation, reduces the water permeability of the soil, and reduces the capillary rise height. Compaction is an economically reasonable measure to improve the engineering properties of soils. The same soil material can form different physical and mechanical indicators under uneven compaction. At the same time, due to creep, the mechanical state and indicators of...

AI Technical Summary

Problems solved by technology

[0005] In summary, the existing soil compaction measurement methods have the following problems: ① The traditional soil compaction measurement methods (ring knife method and sand filling method) are all destructive test methods, and the test results have limitations. It can reflect the compaction quality at the measuring point, and in the actual detection, a large number of measuring points need to be selected, the efficiency is low, and long-term monitoring cannot be carried out; ② For the new nondestructive compaction detection method based on geophysical detection method (such as Nucleon density instrument method, Rayleigh wave detection method, etc.), all use the quantitative relationship between geophysical characteristic parameters and compaction degree to characterize the compaction quality of the foundation, but due to the geophysical characteristic parameters (such as resistivity, elastic wave velocity etc.) are affected by multiple factors such as soil density, moisture content, etc., resulting in unclear quantitative relationship between geophysical characteristic parameters and compaction degree, and the test accuracy of a single test method is not ideal, and it is easy to be disturbed and reduced, and it is difficult to enter the practical field. At present, there is no method and device for long-term monitoring and evaluation of soil compaction quality using the above method

Images