Cross section analysis method for gravel pile compactness detection

Abstract

The invention discloses a cross section analysis method for gravel pile compactness detection. The method includes the steps that first, a to-be-detected gravel pile area is divided into segments, a plurality of test cross sections are selected in each segment, and a plurality of test sites are selected in each cross section; a heavy dynamic penetration test is carried out at the selected test sites, the hammering number N200 (SH) of the dynamic penetration test at each test site of each cross section is obtained, N200 (SH) is converted to N100 (SH), and then a standard penetration test hammering number N is calculated according to N100 (SH); and the standard penetration test hammering number is corrected, the frictional angle of each cross section is judged according to the corrected standard penetration test hammering number, and if the frictional angles of the cross sections in each segment are all larger than or equal to 40 degrees, it is judged that gravel piles in the segment arequalified. By means of the cross section analysis method, the construction quality of the gravel piles can be accurately reflected, and thus analysis results better meet the actual condition; the construction quality of the gravel piles can be quickly determined, the gravel pile compactness detecting time is shortened, and the gravel pile construction speed is increased.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a section analysis method for detecting the compactness of gravel piles. Background technique [0002] With the rapid development of social economy and traffic construction, the problem of soft foundation treatment is constantly involved in highway engineering construction. Because soft soil will cause harm to the subgrade, resulting in substantial subsidence of the subgrade pavement structure and lateral displacement of the subgrade foundation, scientific treatment of soft soil foundation is an inevitable engineering technical problem for highway construction in soft soil areas. In the reinforcement of soft soil subgrade foundation, the vibrating crushed stone pile method is a treatment method with relatively simple construction and quick reinforcement effect. It uses the combination of crushed stone in the pile body and soft soil around the pile to form a composite fou...

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Problems solved by technology

[0003] The current traditional detection methods for the compactness of gravel piles generally have the disadvantages of long detection time and high detection cost, and cannot quickly and accurately evaluate the project quality, especially for the complex soft soil geological conditions in the soft foundation treatment area. For example, soft soil is mainly peat soil and silty clay, which has the characteristics of large natural water content, large natural void ratio, small natural bulk density, large permeability coefficient and low sensitivity. The existing detection methods for the density of gravel piles cannot accurately reflect the The quality of the entire batch of crushed stone piles, for example, the existing detection method generally selects 2% frequency for the detection of the density of the crushed stone piles, and it is required that each crushed stone pile is qualified to determine a batch of crushed stones If the pile is qualified, if the density test of a single gravel pile fails, it will be judged that a batch of gravel piles is unqualified. In fact, the landslide of the roadbed depends on the stability of the cross-section of the roadbed. Unqualified does not mean that the quality of the gravel piles in the entire cross-section is unqualified, so the existing detection method cannot reflect the actual quality of the subgrade well, the detection accuracy is low, the detection speed is slow, and it cannot be well evaluated for the project. Rapid and accurate evaluation of quality cannot meet actual needs

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