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Engineering method for reducing permeability of landscape river soil and sand foundation

A soil-sand base and river course technology, applied in the direction of river regulation, etc., can solve the problems of increasing geological displacement fracture leakage, destroying the geological ecological balance of the river channel, geotechnical anti-seepage liner leakage, etc., to reduce the probability of fracture leakage, The effect of preventing large amounts of leakage and maintaining ecological balance

Inactive Publication Date: 2013-10-09
XUANHUA ZHONGYE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One is the high cost of the project; the other is the fracture leakage caused by geological displacement. Geological movement is absolute, and static is relative. After several years of changes, the geological displacement caused the fracture of the seepage reduction project, resulting in leakage at the fracture Third, the cement or anti-seepage pad completely isolates the river channel from the surrounding soil, so that the surface water of the river channel cannot penetrate into the ground. The geological and ecological balance of the river channel has been intensified, the geological movement has been intensified, and the probability of geological displacement fracture leakage has increased
The fourth is the frost heave cracks between the concrete and the soil foundation due to seasonal temperature changes, and the fifth is that the geotechnical anti-seepage liner is susceptible to displacement and leakage caused by the lifting of river bottom plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] For the river landscape improvement in a certain city, firstly, the river slopes on both sides are paved with geotechnical anti-seepage liners, and cement concrete is built into the landscape. The river bottom base material is large-grained sand and gravel, and the weight percentage of particles larger than 10mm is greater than 50%. Soil must be transported from an external soil field as the base material. The maximum solid particle size of sandy loess is 2mm, and the content of 1mm-2mm similar to the national standard test sieve is expressed in %, and the measured +7 mesh is 14%, +8 mesh is 15%, +9 mesh is 14%, + 10 mesh 16%, +12 mesh 13%, +14 mesh 11%, ±16 mesh 17%. The sum of the product of the mesh number and the content of each particle size grade is 10.86 mesh, which is the average mesh number. Take the similar national standard test mesh number of 10, and the particle size corresponding to 10 mesh is 1.7mm, and the cubic of 1.7 is 1.19, multiplied by 20 is 24, t...

Embodiment 2

[0097] For the river landscape improvement in a certain city, the river slopes on both sides are firstly built with cement concrete to form the landscape. The base material of the river bottom is sandstone, which is screened and measured by a test sieve. The maximum particle size of the sandstone is greater than 10mm, and the weight percentage of particles with a particle size greater than 10mm is 12%, and the sandstone with a particle size not greater than 10mm can be As the base material for construction, take the similar national standard test sieve size according to 1mm / level and express it in %. The measured +2.5 mesh is 14%, +3 mesh is 12%, +4 mesh is 15%, +6 mesh is 9%, +8 mesh 14%, +12 mesh 16%, ±16 mesh 20%. The sum of the product of particle size and content at all levels is 8.09 mesh, which is the average mesh number. The particle size corresponding to 8 mesh is 2.36mm, and the cube root of 2.36 is 1.33. Multiplying 1.33 by 20 is about is 27, then the volume ratio ...

Embodiment 3

[0099] For the river landscape improvement in a certain city, the river slopes on both sides are firstly built with cement concrete to form the landscape. The base material of the river bottom is silt, and the thickness of the virtual paving of the river bottom is 240mm. After screening and measurement by the test sieve, the maximum solid particle size of the river bottom silt base material is less than 1mm, which can be used as the base material for engineering construction. The cube root of 1 is 1, Multiplying by 20 is 20, then the volume ratio of base material and seepage reducing agent in this project is 100:20, the virtual paving thickness of the river bottom design seepage reducing layer project is 240mm, so the virtual paving thickness of seepage reducing agent is 40mm, and one construction Yes, spread the seepage reducing agent 40mm, use a rotary plow and vibrate to compact it, and repeat four to six times to mix and compact.

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Abstract

The invention discloses an engineering method for reducing permeability of a landscape river soil and sand foundation, and belongs to the technical field of landscape river regulation. The method comprises the following steps of: selecting a base material for construction according to size of soil and sand particles of the river soil and sand foundation; measuring average particle diameter of the base material; selecting bentonite according to the average particle diameter and taking the bentonite as a permeability reducing agent, wherein the volumetric ratio of the base material to the permeability reducing agent is 100:a product obtained by multiplying a cubic root value of the average particle diameter numerical value by 20; selecting filling and construction thickness of a permeability reducing layer according to the particle diameter of the soil and sand of the river soil and sand foundation, wherein the filling and construction thickness is 240-400 mm; determining the respective filling and construction thickness of the base material and the permeability reducing agent; and mixing the base material and the permeability reducing agent to form a river bottom permeability reducing layer. By adopting the engineering method provided by the invention, the leakage of a large amount of river landscape water is prevented, and ecological balance of an underground water level is kept; and the method has the advantages of long service life, easiness in construction and low cost.

Description

technical field [0001] The invention relates to the technical field of landscape river regulation, in particular to an engineering method for landscape river regulation. Background technique [0002] In recent years, with the rapid development of the national economy, the government's fiscal revenue and awareness of people's livelihood have been continuously improved, and many cities are engaged in landscape river management. Since the base of landscape rivers is mostly soil or sand, it is easy to cause a large amount of leakage of landscape water, and the control of landscape water leakage has become an important content of landscape river management. [0003] At present, the following two engineering methods are mainly used in the treatment of urban landscape rivers to prevent landscape water seepage: [0004] One is to build a cement base, that is, to build the river slope and the bottom of the river with cement concrete to reduce the leakage of landscape water; [0005...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/02
Inventor 任瑞刚钱文仓
Owner XUANHUA ZHONGYE TECH