Expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and construction method thereof

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 roadbed engineering, and relates to a supporting structure for an expansive soil cutting side slope and a construction method thereof, in particular to a reinforced soil anti-seepage flexible support for an expansive soil cutting side slope and a construction method thereof. Background technique

[0002] When the moisture and ground temperature change, the soil within the depth of the atmospheric influence of the expansive soil will undergo repeated expansion and contraction, causing damage to the surface of the soil and gradually spreading this damage to the depths. At the same time, the effect of the formed expansion and contraction force on the rigid protective structure should not be underestimated. In the process of railway construction, measures such as gentle slope, hierarchical retention platform and rigid slope protection are often used to ensure the stability of expansive soil slopes. Expans...

Examples

Embodiment 1

[0031] Expansive soil cutting high slope reinforced soil back pressure anti-seepage flexible slope protection structure, including: expansive soil cutting side slope 4 and slope toe supporting structure 1. The slope toe supporting structure 1 can be a gravity-type cutting wall, between piles 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 leveled. The reinforced material is a geogrid. When backfilling to 0.5m away from the top of the slope, use mortar and rubble to build the counter-pressure anti-seepage structure 5 of the top of the slope, and at the same time construct the slope protection structure.

Embodiment 2

[0033] The concrete steps for the construction method of the reinforced soil anti-seepage support structure of the expansive soil cutting slope are as follows: ①The site is leveled. Measure the top of the cut and remove the surface soil that needs to be excavated; ②When the construction equipment enters the site, the expansive soil slope must be excavated in the dry season. In order to ensure that the slope is not washed by rain and avoid prolonged exposure, rapid construction methods must be adopted , Centralized excavation with a collection of construction machines; ③Excavation step by step from the slope to the foot of the slope according to the design slope rate, and use different sizes of steps according to the different slope rate, the slope rate is 1:2.0, and the step width 4.0 meters, 2.0 meters high, slope ratio 1:1.75, steps width 3.5 meters, height 2.0 meters, slope ratio 1:1.5, steps width 3.0 meters, height 2.0 meters. Assuming that the expansive soil has a steep l...

Embodiment 3

[0035] Such as figure 1 The reinforced soil anti-pressure anti-seepage support structure shown, after the side slope is excavated once and formed, the slope toe supporting structure 1 and the slope protection structure (geogrid reinforced material 2, backfilled reinforced soil 3, Geomembrane 6, anchor rod 7), which greatly shortens the construction period and avoids prolonged exposure of expansive soil. Among them, the geogrid reinforcement material 2 is laid horizontally every 0.6m, and the composite geomembrane 6 is laid along the excavation surface and spread evenly to ensure a 0.5m overlap. The width and height of the excavated steps are determined according to the design slope rate, and the over-excavation depth is determined according to the depth of the expansive soil's acute atmospheric influence. The mortar and rubble counter-pressure anti-seepage structure 5 is set on the top of the slope to prevent the infiltration of surface water and keep the expansive soil of the ...

Technical field

[0001] The invention belongs to the technical field of railway roadbed engineering, and relates to a supporting structure for an expansive soil cutting side slope and a construction method thereof, in particular to a reinforced soil anti-seepage flexible support for an expansive soil cutting side slope and a construction method thereof. Background technique

[0002] When the moisture and ground temperature change, the soil within the depth of the atmospheric influence of the expansive soil will undergo repeated expansion and contraction, causing damage to the surface of the soil and gradually spreading this damage to the depths. At the same time, the effect of the formed expansion and contraction force on the rigid protective structure should not be underestimated. In the process of railway construction, measures such as gentle slope, hierarchical retention platform and rigid slope protection are often used to ensure the stability of expansive soil slopes. Expans...

Examples

Embodiment 1

[0031] Expansive soil cutting high slope reinforced soil back pressure anti-seepage flexible slope protection structure, including: expansive soil cutting side slope 4 and slope toe supporting structure 1. The slope toe supporting structure 1 can be a gravity-type cutting wall, between piles 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 leveled. The reinforced material is a geogrid. When backfilling to 0.5m away from the top of the slope, use mortar and rubble to build the counter-pressure anti-seepage structure 5 of the top of the slope, and at the same time construct the slope protection structure.

Embodiment 2

[0033] The concrete steps for the construction method of the reinforced soil anti-seepage support structure of the expansive soil cutting slope are as follows: ①The site is leveled. Measure the top of the cut and remove the surface soil that needs to be excavated; ②When the construction equipment enters the site, the expansive soil slope must be excavated in the dry season. In order to ensure that the slope is not washed by rain and avoid prolonged exposure, rapid construction methods must be adopted , Centralized excavation with a collection of construction machines; ③Excavation step by step from the slope to the foot of the slope according to the design slope rate, and use different sizes of steps according to the different slope rate, the slope rate is 1:2.0, and the step width 4.0 meters, 2.0 meters high, slope ratio 1:1.75, steps width 3.5 meters, height 2.0 meters, slope ratio 1:1.5, steps width 3.0 meters, height 2.0 meters. Assuming that the expansive soil has a steep l...

Embodiment 3

[0035] Such as figure 1 The reinforced soil anti-pressure anti-seepage support structure shown, after the side slope is excavated once and formed, the slope toe supporting structure 1 and the slope protection structure (geogrid reinforced material 2, backfilled reinforced soil 3, Geomembrane 6, anchor rod 7), which greatly shortens the construction period and avoids prolonged exposure of expansive soil. Among them, the geogrid reinforcement material 2 is laid horizontally every 0.6m, and the composite geomembrane 6 is laid along the excavation surface and spread evenly to ensure a 0.5m overlap. The width and height of the excavated steps are determined according to the design slope rate, and the over-excavation depth is determined according to the depth of the expansive soil's acute atmospheric influence. The mortar and rubble counter-pressure anti-seepage structure 5 is set on the top of the slope to prevent the infiltration of surface water and keep the expansive soil of the ...

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