Rock-fill object density measure system

Abstract

A rock-fill object density measure system comprises a bearing plate placed on the surface of a rock-fill object, counterweight blocks stacked on the bearing plate, an excitation hammer disposed at one side of the bearing plate and used for providing excitation force, and a wave detector installed on the upper surface of the counterweight block and connected with a vibration frequency tester. The bearing plate and the counterweight blocks are cylinders. The weight of the excitation hammer is 40-60 Kg. By bonding the wave detector on the counterweight blocks, the vibration frequency f of a system composed of surface dam material, the bearing plate and the counterweight blocks can be tested through a vibration source, then the dry density of the rock-fill object is tested by performing a pit measure process, thus the relation curve between the system vibration frequency f and the rock-fill object dry density is established, and a linear analysis formula of the rock-fill object dry density is obtained. The provided rock-fill object density measure system has the advantages of time saving, labor saving, rapidness, no damage, high accuracy and the like.

Description

technical field [0001] The invention relates to the field of rockfill dam density testing in hydropower engineering construction, in particular to a rockfill body density testing system. Background technique [0002] The methods used to measure the density of rockfill bodies in rockfill dams in engineering mainly include test pit method, compaction settlement observation method, vibration roller installation accelerometer method, rolling parameter control method, surface wave method, nuclear density method and additional mass method Wait. Among them, the pit measurement method is a traditional method for detecting the density of rockfill bodies. The result is accurate, but the detection efficiency is low, the representativeness is poor, time-consuming, laborious, expensive, and destructive. It is a point-to-surface method, which is difficult to be objective and comprehensive. reflect the overall quality of dam filling. Because the surface wave method has little influence o...

AI Technical Summary

Problems solved by technology

Among them, the pit measurement method is a traditional method for detecting the density of rockfill bodies. The result is accurate, but the detection efficiency is low, the representativeness is poor, time-consuming, laborious, expensive, and destructive. It is a point-to-surface method, which is difficult to be objective and comprehensive. reflect the overall quality of dam filling

Because the surface wave method has little influence on the dispersion curve due to density changes, and this method has a large detection error for the surface within 1.0m, it is currently difficult to solve the problem of rockfill density determination by the surface wave method; Strict protective measures are required, and the detection requirements are small particle size media with a maximum particle size of no more than 40mm and an effective depth of no more than 200mm. Vibration mass m 0 , stiffness K, the relationship between the wave velocity of the dam material and the density of the dam material, so there is a relatively large error in the test results

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