CN102518136A - Flexible reinforced combined protection structure for preventing and treating humidifying damage of soft rock strongly weathered zone - Google Patents

Abstract

The present invention discloses a flexible reinforced combined protective structure for preventing and controlling the wetting damage of a strongly weathered zone of soft rock. The residual soil layer (1) at the upper part of the slope is provided with a first layer of geotextile (7) and loam (6) and grass on the excavation surface; the soft rock of the strongly weathered rock zone (2) in the middle part of the slope is reinforced by a flexible reinforced retaining structure; the weakly weathered soft rock (3) at the lower part of the slope is protected by three-dimensional grass planting (5). The present invention is a flexible reinforced retaining combined protective structure for preventing the wetting damage of a strongly weathered zone of a soft rock slope, which has stable slopes and greatly reduces the amount of engineering work, and is simple in technology, fast in construction speed, economical and environmentally friendly.

Description

A Flexible Reinforced Composite Protective Structure for Preventing Wet Damage in Soft Rock Strongly Weathered Zone

technical field

The invention relates to a retaining and protective structure for road cutting slopes, in particular to a flexible reinforced composite protective structure for preventing and controlling wet damage in soft rock strong weathering zone.

Background technique

Red-bed soft rocks are often prone to form a residual soil and strongly weathered rock zone with a thickness of 6m-10m in the suitable weathering position. When the soft rock strong-weathered rock zone contains local water retention, the red-bed soft rock in the strong Wet, once excavated, the strong weathered rock zone is often used as the shear outlet, causing shallow collapse and damage. Sometimes, this type of collapse and damage is also caused by the wetting of the soft rock and strong weathered rock belt after the construction is infiltrated by rainfall. At present, in order to prevent the damage of this type of excavation slope, the anchor frame beam is often used to reinforce the slope, but the reinforcement of the anchor frame beam is not only complicated in process, slow in construction speed, and high in cost, but sometimes it still occurs due to the failure of the anchor force. destroy. The wetting failure of the strongly weathered rock zone of the soft rock weathered slope is mainly due to the decrease of the shear strength of the soft rock in the strongly weathered rock zone under the residual soil layer of the slope after wetting, which leads to the excavation of the slope along the strong wind Shear-slip failure occurred in the rock zone.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible reinforced support for anti-wetting damage of soft rock slope with strong weathered rock belt, which is stable in slope, greatly reduces engineering quantity, simple in technology, fast in construction speed, economical and environmentally friendly. Block combined protective structure.

In order to solve the above-mentioned technical problems, the present invention provides a flexible reinforced combined protective structure for preventing and controlling the wet damage of the soft rock strong weathering zone. The first single-layer geotextile is covered with planting loam and grass; the soft rock in the strongly weathered rock zone in the middle of the slope is reinforced with a flexible reinforced support structure; the weakly weathered soft rock in the lower part of the slope is protected by three-dimensional grass planting .

The structure of the flexible reinforced retaining structure is to set a permeable base layer at the bottom of the strongly weathered rock belt, and the permeable base layer is composed of a compacted gravel soil layer. A seepage trench is excavated, and the seepage is composed of soft permeable pipes laid on the waterproof geotextile and filled with gravel; reinforcements are laid in the entire flexible reinforced support structure, and the said The reinforcements of each layer exceed the width of the flexible reinforced retaining structure, are turned up to the upper layer, and are connected with the reinforcements of the upper layer, and the reinforcements of each layer are backfilled and compacted with the excavated backfill soil , a platform and a side ditch are arranged on the top of the flexible reinforced retaining structure, and the top of the platform is composed of a second single-layer geotextile and planted loam.

The reinforcement material is geogrid.

The flexible-reinforced combined protective structure for the prevention and treatment of wet damage in the soft rock strong weathered zone adopts the above-mentioned technical scheme. The belt is protected by grass planting and three-dimensional grass planting respectively. The engineering measures of reinforcement and protection are highly targeted, which not only ensures the stability of the slope but also greatly reduces the engineering volume of the flexible reinforced retaining structure. It is different from the current effective anchor frame beam scheme. Compared with other methods, it has the advantages of simple technology, fast construction speed, economy and environmental protection.

To sum up, the present invention is a kind of flexible reinforced support for anti-wetting damage of soft rock slope with strong weathered rock zone, which is stable in slope, greatly reduces engineering quantity, has simple technology, fast construction speed, and is economical and environmentally friendly. Combined protective structure.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figure 1, according to the wetting failure of the strongly weathered rock zone of the soft rock weathered slope, it is mainly due to the decrease of the shear strength of the soft rock in the strongly weathered rock zone 2 located under the residual soil layer 1 of the slope after wetting, so that The law of shear sliding failure of the excavated slope along the strongly weathered rock belt is protected by a combined scheme in the present invention. The characteristic of the combined scheme is that the residual soil layer 1 on the upper part of the slope can be stable by itself, so it is protected by planting grass. That is to lay a first single-layer geotextile 7 on the excavation surface, and then spread loam 6 and plant grass on the first single-layer geotextile 7; The retaining structure is reinforced; the weakly weathered soft rock at the lower part of the slope is protected by three-dimensional grass planting 5, and the lower part of the slope is provided with road side ditch 13. The flexible reinforced retaining structure has the following characteristics: the bottom layer of the flexible reinforced retaining structure is a permeable base layer, and the permeable base layer is composed of a compacted layer of gravel and soil. A seepage ditch is excavated under the foundation layer, and the seepage is formed by laying soft permeable pipes 14 on the waterproof geotextile 4 and filling gravel 15; laying reinforcements 9 in the entire flexible reinforced support structure, and the reinforcements 9 are geogrids , the reinforcement material 9 of each layer exceeds the width of the seepage ditch, is turned up to the upper layer, and is connected with the reinforcement material 9 of the upper layer, and the reinforcement material 9 of each layer is backfilled and compacted with the excavated backfill soil 10. A platform and a water intercepting ditch 12 are arranged on the top of the reinforcement retaining structure, and the top of the platform is composed of a second single-layer geotextile 11 and planted loam.

Referring to Fig. 1, the present invention only uses the flexible reinforced retaining structure to strengthen in the strongly weathered rock zone, and then respectively adopts grass planting and three-dimensional grass planting protection, reinforcement and protection engineering measures in the residual soil layer of the soft rock slope and the weakly weathered rock zone It is highly targeted, which not only ensures the stability of the slope but also greatly reduces the engineering volume of the flexible reinforced retaining structure. Compared with the current effective anchor frame beam scheme, it has the advantages of simple technology, fast construction speed, economical and environmental protection.

Claims (3)

1. prevent and treat the flexible reinforcement combination safeguard structure that the severely-weathered band humidifying of soft rock is destroyed for one kind; It is characterized in that: the soil layer (1) that remains on side slope top is employed in and is equipped with the first individual layer geotextiles (7) on the excavation face, on the described first individual layer geotextiles (7), is covered with and plants loam (6) and grass planting; The soft rock of the severely-weathered rock zone (2) at side slope middle part adopts flexible reinforcement retaining structure to reinforce; The weak weathering soft rock (3) of side slope bottom adopts three-dimensional grass planting (5) protection.

2. the flexible reinforcement combination safeguard structure that the severely-weathered band humidifying of control soft rock according to claim 1 is destroyed; It is characterized in that: the structure of described flexible reinforcement retaining structure is in the bottom of described severely-weathered rock zone (2) permeable basal layer to be set; Described permeable basal layer is made up of gravelly soil (8) compacted lift; Excavation has sewer under described gravelly soil (8), and described sewer is formed through on waterproof geotextiles (4), being equipped with flexible porous tube (14) and being filled with rubble (15); In whole described flexible reinforcement retaining structure, be equipped with muscle material (9); Every layer described muscle material (9) all surpasses the width of described flexible reinforcement retaining structure; Anti-package is to last layer, and is connected with the muscle material (9) of last layer, and every layer of described muscle material (9) used backfill (10) backfill compacting that is excavated; Be provided with platform and catchwater (12) at the top of described flexible reinforcement retaining structure, described table top is added by the second individual layer geotextiles (11) plants the loam formation.

3. the flexible reinforcement combination safeguard structure that the severely-weathered band humidifying of control soft rock according to claim 2 is destroyed, it is characterized in that: described muscle material (9) is a GSZ.

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