Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for determining maximum dry density of natural-gradation sand and gravel materials for damming

A technology of maximum dry density and gravel materials, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of damaged vibrating mill, inaccurate test results, tilted density bucket, etc., to improve accuracy, ensure rolling effect, The effect of improving efficiency

Inactive Publication Date: 2017-06-30
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
View PDF9 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved is: the existing rolling method can easily cause the density barrel to tilt, which will lead to inaccurate test results and even damage the vibrating roller.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining maximum dry density of natural-gradation sand and gravel materials for damming
  • Method for determining maximum dry density of natural-gradation sand and gravel materials for damming
  • Method for determining maximum dry density of natural-gradation sand and gravel materials for damming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Taking a large reservoir as an example, the main dam uses clay core wall gravel (pebble) stone dam, and the dam shell material is designed as natural graded gravel (pebble) stone. The main problems in the stockyard are: due to the serious phenomenon of artificial sand mining in recent years As a result, the fine particles of gravel (pebble) in the upper layer of the stockyard are missing, and the natural gradation curve, physical and mechanical parameters, mining conditions, etc. of the gravel (pebble) in the stockyard are changed. Due to the large change in the gradation range of the disturbance material after manual mining, the dispersion is large. In order to ensure the construction quality of the dam, it is very critical to further clarify the gradation envelope of the upper dam material and determine the control standards and control indicators of the dam filling before the dam construction.

[0035] Adopt the method that the present invention determines the maximu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of sand and gravel material soil tests, and discloses a method for determining the maximum dry density of natural-gradation sand and gravel materials for damming. The method comprises the following steps: preparing density barrels according to the size of the sand and gravel material, digging a groove in a test site, laying fine sand on the bottom surface of the groove, and performing static rolling, leveling and compaction; arranging the density barrels at intervals in an extension direction of the groove, and marking positions of center points of the density barrels; manually mixing raw materials according to test required gradation, sequentially filling the density barrels and the groove around the density barrels with the raw materials, performing forward and backward driving vibration rolling for 26 times, performing precise calculation to determine residual rolling times, performing driving vibration rolling again, performing barrel top leveling after rolling completion, measuring the volume of each density barrel, weighing the mass of the sand and gravel materials in each density barrel, and then performing calculation to obtain the maximum dry density of the sand and gravel materials. The method adopts a more reasonable rolling manner, and can rapidly and accurately determine the maximum dry density of the sand and gravel materials, thereby avoiding damage to relevant equipment.

Description

technical field [0001] The invention relates to the technical field of sand and gravel material geotechnical tests, in particular to a method for determining the maximum dry density of the original gradation sand and gravel material for dam construction. Background technique [0002] The maximum dry density of sand and gravel is a key parameter in determining relative density index and construction quality control. Due to the size effect, the indoor relative density test cannot well reflect the actual situation of fully graded gravel materials on site, especially now that large-scale machinery and equipment are widely used in water conservancy projects, so that relative density often occurs in on-site rolling tests and on-site construction inspections. An unreasonable phenomenon with a density greater than 100%. It is an effective way to solve the above-mentioned unreasonable phenomenon to carry out large-scale relative density tests on the original gradation of sand and gr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02
CPCG01N9/02G01N2009/026
Inventor 杨玉生刘启旺刘小生温彦锋赵剑明王龙
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products