Rock-fill dam material compaction quality detection method based on soil body rigidity

Abstract

The invention discloses a rock-fill dam material compaction quality detection method based on soil rigidity, which comprises the following steps: in combination with the rolling characteristics of a rock-fill dam material, establishing a rolling machine-soil body vibration system three-degree-of-freedom kinetic analysis model capable of being applied to the rock-fill dam material, and obtaining the relationship between soil body parameters and the acceleration of the vibration system; obtaining the absolute value of the measured acceleration signal data of the vibration wheel, performing peak value selection and moving average, and obtaining the average amplitude a2m of the acceleration signal of the vibration wheel; by means of parameter sensitivity analysis, assuming that the soil body damping cs is always a damping value in an initial rolling state, and rapidly calculating the soil body rigidity to reflect the compaction quality of the rock-fill dam material in the vibration compaction process according to the obtained acceleration average amplitude a2m and the relation between the soil body parameters and the acceleration. The method disclosed by the invention can be applied to compaction quality field control and detection of fine materials such as clay core walls and the like, and also has a relatively good detection effect on coarse-grained materials such as rockfill materials and sand gravel materials.

Description

technical field [0001] The invention relates to the field of rockfill dam material quality detection, in particular to a rockfill dam material compaction quality detection method based on soil stiffness. Background technique [0002] The compaction quality of rock and soil materials is an important content in the construction quality management of railway and highway subgrades, airport runways and water conservancy dams. The research on real-time compaction quality detection technology was first carried out in the field of road engineering at home and abroad, and the concept of continuous compaction control CCC (Continuous Compaction Control) was proposed around the 1980s, and ACT (Advanced Compaction Technology) detection technology was formed. This technology regards the roller as a dynamic loading object, and obtains the compaction status of rock and soil materials by installing corresponding sensors on the roller of the vibratory roller to measure and analyze the dynamic...

AI Technical Summary

Problems solved by technology

[0008] (2) Processing lag

The test pit detection method needs to be carried out after the rolling operation of the entire rolling surface is completed, which belongs to post-control, and cannot detect and process the weak position of rolling in real time; when the test results do not meet the rolling standard and need to be reworked, the rolling It is difficult to re-determine the parameters and control standards of the dam, and the re-rolling is easy to cause over-rolling of the qualified parts, resulting in changes in the gradation of the dam material

[0009] (3) Complicated operation

[0019] It can be seen that its adaptability to different rolling areas is not good, especially on coarse-grained materials such as rockfill materials; the detection index reflects the vibration state of the vibrating wheel and soil rolling system, and cannot simply reflect the soil The vibration and compaction status of the body; the physical meaning of the detection index itself is not clear enough, the vibration wheel signal in the compaction quality detection of rockfill dams does not only have the second harmonic, and does not consider the influence of higher harmonics

Images