A Collapsible Loess Subgrade Treatment Method Based on the Principle of Lightweight Soil Weight Reduction

A technology for collapsible loess and treatment methods, which is applied in the field of permeable road construction in sponge cities in collapsible loess areas, which can solve the problems of insufficient storage and utilization of rainwater resources, large capital investment, and large engineering volume, etc., and achieve urban improvement. Ecological environment, improvement of living environment, and effect of reducing engineering volume

Active Publication Date: 2020-09-11
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above collapsible loess roadbed treatment method needs to replace all the collapsible loess layer, requiring a lot of labor, machinery, and financial resources, and the replacement materials block the water from entering the subgrade work area and foundation, resulting in a large amount of engineering and a long construction period. , There is a lot of capital investment, and the rainwater resources cannot be stored and utilized

Method used

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  • A Collapsible Loess Subgrade Treatment Method Based on the Principle of Lightweight Soil Weight Reduction
  • A Collapsible Loess Subgrade Treatment Method Based on the Principle of Lightweight Soil Weight Reduction
  • A Collapsible Loess Subgrade Treatment Method Based on the Principle of Lightweight Soil Weight Reduction

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preparation example Construction

[0032] The preparation method of the above cotton stalk fiber lightweight soil comprises the following steps:

[0033] First, the cotton stalks are crushed, peeled, fiberized, washed and dried in turn to obtain cotton stalk fibers; then water is added to the mixture of raw soil, cotton stalk fibers, cement and sand to obtain cementitious materials; finally Mix EPS particles with cementing materials to make lightweight soil with cotton stalk fibers, and the dosage of cotton stalk fibers, cement, sand, EPS particles and water is 0.4%-0.8% and 2%-4% of the weight of the raw soil in sequence , 6% to 12%, 1% to 1.5% and 30% to 50%.

[0034] The preparation method of described cotton stalk fiber specifically comprises the following steps:

[0035] 1.1) Crushing the cotton stalks in a pulverizer to obtain cotton stalks cut to a length of 50 mm to 300 mm;

[0036] 1.2) The cotton stalks cut off in step 1.1) are sequentially soaked and pith removed to obtain the cotton stalk bark;

...

Embodiment 1

[0046] The first step is to collect soil samples from site 1 (collapsible loess area in Guanzhong area) through geological survey, and determine the physical parameters of different soil layers in site 1 through experiments, such as specific gravity, moisture content, density, dry density, and natural void ratio , saturation, according to the "SL237-1999 Geotechnical Test Regulations" method, use the above parameters to calculate the water content of 85% saturation of each layer of collapsible loess under different pressures (used to calculate the wet density of 85% saturation), saturation Wet density at 85% saturation, self-weight pressure (calculated based on wet density at 85% saturation), initial pressure of collapsibility, and collapsibility coefficient, see Table 1-1 (n=8). Among them, the collapsibility coefficient is a parameter to determine the degree of site collapsibility, and the relationship between the collapsibility coefficient and pressure at different depths is...

Embodiment 2

[0061] The first step is to collect soil samples from site 1 (collapsible loess area in Guanzhong area) through geological survey, and determine the physical parameters of different soil layers in site 1 through experiments, such as specific gravity, moisture content, density, dry density, and natural void ratio , saturation, and calculate self-weight pressure, initial pressure of collapsibility, and collapsibility coefficient, see Table 1-1, the relationship between collapsibility coefficient and pressure at different depths is as follows figure 1 shown.

[0062] In the second step, according to the calculation formulas of self-weight collapsibility Δzs and collapsibility Δs in "GB50025-2004 Building Code for Collapsible Loess Areas", calculate the self-weight collapsibility and collapsibility of each layer and the total self-weight collapsibility ( The results are shown in Table 2-1 (counting from the surface to the bottom layer) and total collapsibility (counting from the s...

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Abstract

The invention discloses a collapsible loess roadbed treatment method based on the lightweight soil weight reduction principle. Physical and mechanical property parameters of different soil layers in one field are determined through the experiment; the dead load collapsibility amount and the collapsibility amount of various layers, the dead load collapsibility total amount and the total collapsibility amount are calculated; replacement filling and weight reduction are conducted through lightweight soil with certain density, compressive strength and permeability, and when the dead load collapsibility total amount of the field obtained after replacement filling is smaller than or equal to 70 mm, the field is converted into non-dead-load collapsibility from dead load collapsibility, and the replacement filling thickness of the lightweight soil is obtained. The limited replacement filling thought of the lightweight soil is utilized for solving the problem about roadbed collapsibility deformation, excessive treatment is avoided, and an important significance is achieved for saving project construction fund input and resource saving; and meanwhile, certain permeability is achieved for a replacement filling layer, and the water permeability road construction requirement of sponge cities is met.

Description

technical field [0001] The invention relates to the construction of permeable roads in sponge cities in collapsible loess areas, in particular to a foundation treatment method suitable for road construction in collapsible loess areas. Background technique [0002] Collapsible loess is widely distributed in Northwest my country, North China and the middle reaches of the Yellow River. Accidents due to loess subsidence are common occurrences in road engineering construction, which brings great difficulty to road construction and maintenance, and causes serious economic losses at the same time. Collapsible loess is a kind of unsaturated under-pressure dense soil, and it is sensitive to water: in the natural state, the moisture content and compressibility of the soil are low, and the strength is high, but when it is wetted by water, the soil The strength of the soil is significantly reduced, and the collapsible deformation is caused by the combined action of additional pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/00E01C3/04
CPCE01C3/00E01C3/04
Inventor 张爱军米文静任文渊刘宏泰郭敏霞时乐陈和刚柳丽英
Owner NORTHWEST A & F UNIV
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