Dynamic sounding method for detecting compaction degree by replacing sand replacement method with foundation bearing capacity

Abstract

The invention discloses a dynamic sounding method for detecting a compaction degree by replacing a sand replacement method with foundation bearing capacity. The dynamic sounding method comprises the steps of manufacturing a steel mould with the inside diameter of 200 mm and the height of 350 mm through a mould manufacturing technology; calculating the optimal water content and the maximum dry density through an indoor compaction test; performing static pressure molding with a press machine according to the optimal water content and the maximum dry density of soil as well as the specified compaction degree, and then selecting light or heavy dynamic sounding according to the soil types; then, detecting a test piece according to the dynamic sounding method of the foundation bearing capacity to obtain the indoor data; performing detection by replacing the sand replacement method with the dynamic sounding method on site, if the result is no lower than the indoor detection data, the compaction degree is qualified; the detection data in the dynamic sounding method disclosed by the invention is more comparable and reliable, so that the result is closer to the true value; it is more important that the detection efficiency is improved greatly; the detection speed is high, and the data is more accurate; the field detection requirements and the actual progress requirements of a construction site are met, and detection counterfeiting is avoided; and the cost is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of office desks and chairs, in particular to a dynamic penetrating sounding method for detecting the degree of compaction by substituting the bearing capacity of the foundation for sand filling. Background technique [0002] In T0921-2008 of JTGE60-2008 "On-site Test Regulations for Highway Subgrade and Pavement", there are great loopholes and inconsistencies in the method of testing compaction by sand filling method, and there is a big hidden danger of deviation between the test results and the true value . The specific performance is as follows: the purpose and scope of application mentioned that the diameter of the sand filling cylinder is 150mm, and the detection thickness does not exceed 200mm; while the method and steps 3.3 Calibration of the cone sand quality mentioned that the volume of the outflowing sand is equivalent to the volume of the pit dug on the construction site (or equal to The volume of...

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Problems solved by technology

[0002] In T0921-2008 of JTGE60-2008 "On-site Test Regulations for Highway Subgrade and Pavement", there are great loopholes and inconsistencies in the method of testing compaction by sand filling method, and there is a big hidden danger of deviation between the test results and the true value

The specific performance is as follows: the purpose and scope of application mentioned that the diameter of the sand filling cylinder is 150mm, and the detection thickness does not exceed 200mm; while the method and steps 3.3 Calibration of the cone sand quality mentioned that the volume of the outflowing sand is equivalent to the volume of the pit dug on the construction site (or equal to The volume of the calibration tank), and 3.5 mentioned that the depth of the test hole should be equal to the thickness of the measured layer, and the thickness was mentioned three times, but the thickness data referred to was not clear (no quantitative data), but the usual practice is to calibrate the quantitative sand When the density is loose, the volume of the outflowing sand is equal to the volume of the calibration tank, and the thickness of each layer of the field, especially the compacted layer of the roadbed, is generally above 250mm, even up to 350mm. In this way, if the depth of the test hole should be If it is equal to the thickness of the measurement layer, it will inevitably contradict the previous paragraph that the detection thickness of the sand filling cylinder should not exceed 200mm, and if it is really necessary to detect that the thickness is equal to the thickness of the measurement layer, it is very likely that all the sand in the sand filling cylinder will be filled. Insufficient, which leads to the failure of the detection, and the calibration sand density itself and the weight of the sand itself are related to the height of the sand pile and the state of the sand (air humidity), which will lead to distortion of the detection data

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