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Construction method using red-layer mudstone as high-fill dynamic compaction roadbed filler

A technology for red-bed mudstone and roadbed filler is applied in the field of dynamic compaction construction of red-bed mudstone high-fill roadbed, which can solve the problems of complex construction process, low efficiency, and no construction technical scheme is proposed, so as to simplify construction operation steps and reduce construction. Steps, avoid the effect of filling duplication of construction

Active Publication Date: 2021-08-17
CCCC ROAD & BRIDGE CONSULTANTS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are few studies on the complete construction technology of red bed mudstone filling roadbed. The current roadbed filling is mainly based on the construction method of layered filling and multi-layer ramming or rolling, and the waterproof and drainage treatment is still based on the traditional pavement surface layer. Foamed asphalt waterproof combined with drainage of sand and gravel layer, the construction process is complicated and the efficiency is low
A complete construction technical plan has not yet been proposed for the construction method of treating high-fill red mudstone subgrade by dynamic compaction combined with the design of drainage and waterproofing of high-fill red mudstone subgrade

Method used

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  • Construction method using red-layer mudstone as high-fill dynamic compaction roadbed filler
  • Construction method using red-layer mudstone as high-fill dynamic compaction roadbed filler
  • Construction method using red-layer mudstone as high-fill dynamic compaction roadbed filler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see Figures 1 to 4 ,

[0041] A construction method using red-bed mudstone blocks as high-fill dynamic compaction subgrade filler,

[0042] Include the following steps:

[0043] S1. Perform pre-disintegration treatment on the red bed mudstone, and expose the blasted red sandstone filler to the atmosphere, sunlight and rain without covering. The total number of days for the pre-disintegration treatment is 8 to 15 days.

[0044] Under the action of these natural factors, the red bed mudstone weathered and disintegrated rapidly, its strength decreased sharply, and its activity was rapidly eliminated.

[0045] S2. The pre-disintegrated red sandstone filler can be transported to the embankment for filling, and then undergo dynamic compaction treatment, first point compaction twice, and then full compaction once.

[0046] The processing method of this step is to tamp the embankment filler, accelerate the drainage and consolidation of the filler, and increase the compactne...

Embodiment 2

[0057] see Figures 1 to 4 ,

[0058] A construction method using red-bed mudstone blocks as high-fill dynamic compaction subgrade filler,

[0059] Include the following steps:

[0060] S1. Pre-disintegrate the red mudstone, and expose the blasted red sandstone filler to the atmosphere, sunlight and rain without cover. When the highest temperature is higher than 30°C in sunny days, water once a day. The temperature in sunny days is the lowest. When the high temperature is lower than 30°C, water once every other day, and the total number of days for pre-disintegration treatment is 8 to 15 days. The method for judging whether the red bed mudstone has been disintegrated is that large pieces of newly disintegrated red sandstone with a particle size of 50-70 cm, after several days of pre-disintegration treatment, a large number of cracks have appeared on the surface and most of the fragmented rocks have disintegrated. When pushing with the soles of the feet, the large rock block...

Embodiment 3

[0074] see Figures 1 to 4 ,

[0075] A construction method using red-bed mudstone blocks as high-fill dynamic compaction subgrade filler,

[0076] Include the following steps:

[0077] S1. Pre-disintegrate the red mudstone, and expose the blasted red sandstone filler to the atmosphere, sunlight and rain without cover. When the highest temperature is higher than 30°C in sunny days, water once a day. The temperature in sunny days is the lowest. When the high temperature is lower than 30°C, water once every other day, and the total number of days for pre-disintegration treatment is 8 to 15 days. The method for judging whether the red bed mudstone has been disintegrated is that large pieces of newly disintegrated red sandstone with a particle size of 50-70 cm, after several days of pre-disintegration treatment, a large number of cracks have appeared on the surface and most of the fragmented rocks have disintegrated. When pushing with the soles of the feet, the large rock block...

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Abstract

The invention belongs to the technical field of dynamic compaction construction of a red-layer mudstone high-fill roadbed, and discloses a construction method. The invention mainly aims to solve the problems caused by using the red-layer mudstone as the roadbed filler. The method comprises the following steps: firstly, carrying out pre-disintegration treatment on red-layer mudstone; then, tamping a red-layer mudstone filler through dynamic compaction construction, and tamping the embankment through a construction scheme that point compaction is conducted firstly and then full compaction is conducted, so that the compactness of the embankment filler meets the corresponding construction requirement, and water permeation is reduced; paving lime soil and sand on the upper surface layer of the embankment to serve as a waterproof cushion layer, and performing tamping; after roadbed filling is completed, applying a soil hydrophobic agent on the surface of a roadbed slope to prevent the red-layer mudstone filler from absorbing natural rainfall through the hydrophobic effect; and continuously laying a sandy water guide layer on the roadbed slope to prevent surface rainfall from being accumulated in gaps in the roadbed. The dynamic compaction technology and the red-layer mudstone pre-disintegration technology are utilized, so that the red-layer mudstone roadbed has good compactness and stability, and the long-term safety and stability of the red-layer mudstone roadbed are guaranteed in combination with the waterproof and drainage design.

Description

technical field [0001] The invention relates to the technical field of dynamic compaction construction of red-bed mudstone high-fill embankment. Background technique [0002] Since the Mesozoic, that is, the Triassic, Jurassic, Cretaceous, and Cenozoic Paleogene lacustrine, fluvial, alternate river-lake or foothill-diluvial continental clastic subsidence rocks of the red strata, in Sichuan, my country The basin is its core development area, and its lithology is dominated by sandstone, mudstone, and siltstone, among which mudstone has the largest content and proportion. Red bed mudstone has strong hydrophilicity and weak water permeability. If it is in full contact with water, it will soften and plasticize, and has the characteristics of weak weathering resistance and low strength. [0003] When it is used as roadbed filler, because the particles are easily broken, the uniaxial compressive strength is low, the weathered products are easy to disintegrate and soften when expose...

Claims

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Application Information

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IPC IPC(8): E01C3/04E02D3/10E02D3/046E02D17/20
CPCE01C3/04E02D3/10E02D3/046E02D17/20Y02A30/60
Inventor 尹红亮申艳军文良东郝建帅顾金柱贾海梁白志鹏
Owner CCCC ROAD & BRIDGE CONSULTANTS
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