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Expansive Soil Cutting Slope Reinforced Soil Anti-seepage Support Structure and Construction Method

A technology of supporting structure and reinforced soil, which is applied in basic structure engineering, excavation, construction, etc., can solve the problems of not meeting the requirements of the construction period, the rigidity of the protective structure cannot meet the stability requirements of expansive soil, and it is only suitable for saving engineering. The effect of cost, shortening construction period and reducing transportation cost

Active Publication Date: 2019-06-25
KUNMING SURVEY DESIGN & RES INST OF CREEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, scholars at home and abroad have carried out a lot of research work on the above problems. The multi-row pile and pile-wall combination structure is the most commonly used method. Although it solves the stability problem of expansive soil slopes, it cannot meet the construction period requirements.
Patent CN103572777A discloses a geocell retaining wall and its construction method, which can greatly shorten the construction period, but the rigidity of its protective structure cannot meet the stability requirements of expansive soil, and it is only suitable for the protection of road slopes
Flexible slope protection can effectively solve the slope protection of expansive soil slopes. For example, patent CN102535485A discloses a reverse construction method for flexible protection of reinforced soil cutting slopes, but it is only suitable for soft soil cutting slopes, and still cannot meet the construction period Require
It can be seen that the existing support and protection measures need to be further improved.

Method used

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  • Expansive Soil Cutting Slope Reinforced Soil Anti-seepage Support Structure and Construction Method

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Experimental program
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Effect test

Embodiment 1

[0030] Expansive soil cutting high side slope reinforced soil anti-seepage flexible slope protection structure, including: expansive soil cutting side slope 4 and slope toe retaining structure 1, slope toe retaining structure 1 can be a gravity type cutting retaining wall, pile inter-pile Retaining walls and pile-slab walls. After the excavation of the slope surface is completed, a layer of geomembrane material is laid along the excavation surface, and the reinforced soil is backfilled after the paving is smooth. The reinforcement material is geogrid. When the backfill is 0.5m away from the top of the slope, the anti-seepage structure 5 at the top of the slope is replaced by masonry rubble masonry, and the slope protection structure is constructed at the same time.

Embodiment 2

[0032] The construction method of the expansive soil cutting slope reinforced soil anti-seepage support structure, the specific steps are as follows: ① Site leveling. Measure the range of the top of the cutting and remove the surface soil that needs to be excavated; ② When construction machines enter the site, the expansive soil slope must be excavated in the dry season. In order to ensure that the slope will not be washed by rain and avoid long-term exposure, a rapid construction method must be adopted , gather construction machines and tools for centralized excavation; ③ Excavate the slope to the foot of the slope step by step according to the design slope ratio, use different sizes of steps for excavation according to different slope ratios, the slope ratio is 1:2.0, and the step width 4.0 meters, 2.0 meters high, slope ratio 1:1.75, steps 3.5 meters wide, 2.0 meters high, slope ratio 1:1.5, steps 3.0 meters wide, 2.0 meters high. Assume that the depth of the acute layer of...

Embodiment 3

[0034] Such as figure 1For the reinforced soil anti-seepage support structure shown in the figure, after the first excavation of the slope is formed, the slope toe support structure 1 and the slope protection structure (geogrid reinforcement material 2, backfill reinforcement soil 3, Geomembrane 6, anchor rod 7), thus greatly shortening the construction period and avoiding long-term exposure of expansive soil. Among them, the geogrid reinforcement material 2 is horizontally laid in a layer every 0.6m, and the composite geomembrane 6 is laid along the excavation surface and paved evenly to ensure a 0.5m overlap. The width and height of the excavation bench are determined according to the design slope ratio, and the over-excavation depth is determined according to the depth of the steep layer affected by the atmosphere of the expansive soil. The top of the slope is equipped with a back pressure anti-seepage structure 5 of masonry rubble to prevent the infiltration of surface wa...

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Abstract

The invention provides an en expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and a construction method thereof. The supporting structure comprises an expansive soil road cutting side slope, a slope toe retaining structure is arranged at the toe of the slope, a geomembrane seepage-preventive structure, a reinforced soil slope surface protection structure and an anchor rod system are arranged on the surface of the slope, and a slope top back-pressure seepage-preventive structure is arranged at the top of the slope. The supporting structure is simple in form, the protection structure is high in flexibility and short in construction period, the problems of stability and construction period of an expansive soil high slope can be solved effectively, and the supporting structure is an innovation for high and steep expansive soil road cutting side slope excavation scheme and supporting technology in the field of railway engineering.

Description

technical field [0001] The invention belongs to the technical field of railway embankment engineering, and relates to a support structure of an expansive soil cutting slope and a construction method thereof, in particular to a reinforced soil anti-seepage flexible support of an expansive soil cutting slope and a construction method thereof. Background technique [0002] The soil within the atmospheric influence depth range of expansive soil will repeatedly expand and contract when the moisture and ground temperature change, which will cause damage to the surface of the soil and gradually spread this damage to the depth. At the same time, the effect of the formed expansion and contraction force on the rigid protective structure cannot be underestimated. In the process of railway construction, measures such as gentle slopes, graded retention platforms, and rigid slope protection are often used to ensure the stability of expansive soil slopes. Expansive soil slopes must be exc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/20E02D5/76E02D19/02
CPCE02D5/76E02D17/20E02D17/207E02D19/02E02D2300/002
Inventor 聂文峰曾晓波李能李光慧王志伟张蕊芶文锦王识邱绍富杨子龙陈琼王卫斌任庆慧
Owner KUNMING SURVEY DESIGN & RES INST OF CREEC
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