Gravel mixing method for core wall earth material of earth-core wall dam
A soil material and soil core technology, which is applied in the field of gravel-mixed soil core wall dam core wall, can solve the problems of large discreteness, poor stability of gravel soil properties, unstable core gravel soil material properties, etc., to improve quality and controllability, save engineering investment, and expand the effect of selection range
Active Publication Date: 2021-03-23
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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Problems solved by technology
Both of these two blending processes are to mix the soil material with the gravel (broken) in a fixed ratio after the material is mined in the stockyard. The gravel soil formed by this blending method has poor stability and index fluctuation larger
[0005] In the prior art, limited by the P of the soil in the natural soil field 5 The content is spatially variable, soil P 5 The discreteness of the content is large, and after a fixed ratio is used, the properties of the gravel soil material in the core wall are unstable, the discreteness is large, and there is a large deviation from the expected value range of the design, such as figure 1 shown
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[0059] The present invention implements according to the following steps:
[0060] Step 1: Establish a three-dimensional geological information system for the material source for the core wall soil material yard, and use the cloud map to represent the different areas of the material yard P 5 The variation range of the content, the P 5 The content of the P in the stockyard is carried out in multiple set parameter range intervals arranged continuously 5 Content division, the difference between the upper limit and the lower limit of a single set parameter range is 10% to 15%; according to the production of gravel materials, determine the dynamic divisional mining range of soil materials; after selecting the mining area, in the In the area, the backhoe excavator is used to mine the soil facade at a height of 4m. At the same time of mining, it is mixed twice on the warehouse surface, and then transferred to the mixing field;
[0061] Step 2: In the mixing field, the 10m×10m grid ...
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The invention relates to a gravel mixing method for a core wall earth material of an earth-core wall dam, and belongs to the technical field of gravel earth material preparation methods in hydroelectric and hydraulic engineering. Based on a detection result of initial P5 content in an earth material in a natural material yard, the mixing ratio of the earth material to a stone material is dynamically calculated and analyzed according to the spatial differential distribution of the P5 content in the earth material, the mixing ratio is determined, and mixtures with different earth-stone ratios are mixed by using a mature and simple construction process, so that the P5 content in gravelly soil obtained after mixing is accurately controlled within a certain range, and the guarantee rate of thedesigned expected value is 90% or above. By adopting the method, the P5 content range can be narrowed by 3-4 times, the core-wall gravelly soil quality and controllability are greatly improved, and the development of a high gravelly-soil core-wall rockfill dam building technology is promoted. Meanwhile, since the selection range of the earth material yard is expanded, engineering investment can beeffectively reduced, and land resources are saved.
Description
technical field [0001] The invention relates to a gravel-mixing method for soil core wall dam core wall soil material, and belongs to the technical field of gravel soil material preparation methods in hydropower and water conservancy projects. Background technique [0002] Earth core dam is a widely used dam type in water conservancy and hydropower engineering construction, and occupies an important position in dam construction at home and abroad. Due to the large difference in the deformation modulus of filling materials in different areas, there is usually a certain deformation inconsistency between the dam core wall and the dam shell area, and this deformation inconsistency is particularly prominent in high earth core dams. In order to minimize the deformation incompatibility between the core wall area and the dam shell area due to the difference in deformation modulus, a certain proportion of gravel is often mixed in the core wall soil material in engineering to form cor...
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IPC IPC(8): B28C3/00G01N33/00
CPCB28C3/00G01N33/00
Inventor 余挺金伟朱先文杨晨光姜媛媛王勇周正军
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE