CN107761668B - Coastal shore reservoir land-building type revetment structure and construction method thereof - Google Patents

Abstract

The invention provides a revetment structure of coastal waterfront reservoir building type, comprising a soil filling interface step arranged along the slope of a bank protection foundation, a permeable soil filling layer covering the filling interface step, and a permeable soil filling layer covering the permeable soil layer. The impervious filling layer on the top of the water-proof filling layer; the impermeable filling layer is arranged in a multi-step structure from bottom to top along the slope of the bank protection foundation, and a permeable filling layer is also arranged at the entire bottom of the steps of each impervious filling layer. between the permeable soil filling layer and the impermeable soil filling layer are provided with anti-seepage geotextiles; the permeable soil filling layer is filled with sand and gravel, and the impermeable soil filling layer is made of cohesive soil Layered filling. The invention forms a filling structure that ensures the stability of the bank slope of the coastal reservoir and simultaneously increases the land, effectively protects the geological environment of the coastal reservoir area, and promotes the development and utilization of land resources on the bank slope.

Description

A kind of coastal waterfront reservoir building revetment structure and its construction method

technical field

The invention relates to the field of bank protection design and construction of a coastal waterfront silo, in particular to a land-building type revetment structure and a construction method thereof.

Background technique

In the past 30 years, in order to vigorously develop hydropower resources, taking into account the needs of flood control and regional water resources allocation, a large number of large and extra-large reservoirs have been built. According to incomplete statistics, 80-90% of reservoir landslides are related to reservoir water activities, and bank slope damage is not only related to the material structure of the bank slope, but also to changes in the ocean water level of the reservoir. According to preliminary statistics, there are a large number of urban market towns in the coastal reservoirs in my country. For example, there are more than 60 urban market towns in Badong, Zigui, Yichang, Wushan, Fengjie, Kaizhou, Yunyang, Wanzhou, Zhongxian and Fengdu in the Three Gorges Reservoir area. The Binku area has more than 10 million inhabitants. As a high-incidence area of geological disasters, the infrastructure construction and the management of geological disasters on the bank slope must be highly integrated and developed in a coordinated manner.

The slope type bank protection structure is to directly protect the building materials or components on the embankment or the water-facing slope of the beach to form a continuous covering layer to prevent the erosion and scouring of water flow, wind and waves. This form of protection is arranged in the direction of the water flow, which has less impact on the water flow and does not affect shipping, so it is widely used. The rivers in the middle and lower reaches of the Yangtze River in China are relatively stable, and slope-type revetments are widely used in places with deep water and rapid currents, dangerous embankment sections, important cities, and ports and wharves. However, in order to control the river situation and the flood control safety of the coastal reservoir, the slope-type revetment structure in the prior art focuses on the structural design of hard materials such as block stone and concrete, which leads to a serious phenomenon of hardening of the revetment. The hardened revetment structure damages the river bed. The connection with the riparian ecosystem cuts off the contact between organisms and microorganisms in the water and the land. At the same time, the hardened riparian makes the aquatic plants unable to grow, which seriously affects the ecosystem of the coastal reservoir; in addition, the conventional hard revetment structure also May cause diversion of scour and erosion problems, reduce the ability of coastal rivers to reduce the energy of running water, and cause more severe erosion downstream.

Aiming at the stability and safety of the bank slope in the engineering control area, the design and construction of the bank slope protection project from the perspective of geological disaster control is the only technical path for the prevention and control of the bank slope geological disaster at home and abroad. It even brings many unfavorable factors to the subsequent urban infrastructure construction. In other words, the integration of geological hazard management and land resource development and utilization on the bank slope of the coastal reservoir has important practical significance.

SUMMARY OF THE INVENTION

Aiming at the defects in the prior art, the present invention provides a shore-side reservoir building-type revetment structure and a construction method thereof, so as to ensure the stability of the bank slope of the shore-side reservoir and generate new land with an area of "B×the length of the revetment project". fill structure.

In order to achieve the above-mentioned purpose, the present invention provides a revetment structure of coastal waterfront reservoir building type, the key of which is that it includes a filling interface step arranged along the slope of the bank protection foundation, a permeable filling layer covering the filling interface step, and a covering layer. The impermeable fill layer on the permeable fill layer; the impermeable fill layer is arranged in a multi-step structure from bottom to top along the slope of the bank protection foundation, and the entire bottom of the steps of each impermeable fill layer is at the bottom A permeable soil filling layer is also provided; an anti-seepage geotextile is provided between the permeable soil filling layer and the impermeable soil filling layer; the permeable soil filling layer is filled with sand and gravel, and the impermeable soil filling layer is The filling layer is made up of layers of cohesive soil.

Further, the slope angle θ of the step slope of the filling interface is 30°, the width of the step plate is 100cm, and a drainage hole is provided on the step slope of the filling interface, and the drainage hole and the bottom line of the step slope are separated. The included angle is 10°～30°.

Further, the permeable soil filling layer is formed by filling and compacting with sand and gravel, and the compaction degree is not less than 85%.

Further, the impervious filling layer is formed by layering and compacting of cohesive soil, the layered thickness is 20-30 cm, and the compaction degree is not less than 85%.

Further, the step height h of the impermeable filling layer is 300-500cm, the width a of the step plate is 200cm, and the upper plate width B of the last step from bottom to top along the revetment foundation slope is 300-600cm.

Further, the thickness of the permeable soil layer at the bottom of the steps of each impermeable soil layer is 30-50cm.

Further, an anchoring system is also included. The anchoring system includes an anchor rod and an anchor rod lattice hook. In the bank slope soil body; the anchor rod lattice hook is hung on the stepped slope surface of the impermeable filling layer to form a stable connection between the anchor rod and the stepped slope surface of the impermeable filling soil layer.

Another object of the present invention is to provide a method for building a waterfront bank revetment structure, the key of which is to include the steps:

a. Determine the building position of the bank protection structure according to the geological and geomorphological conditions of the coastal reservoir;

b. Excavate a soil-fill interface step along the slope of the bank protection foundation at the building site, set drainage holes on the slope of the step, and cover the permeable soil fill layer on the soil-fill interface step, and the permeable soil layer is made of sand and gravel according to the The relevant national technical standards are filled with compaction, and the compaction degree is not less than 85%;

c. Lay anti-seepage geotextiles on the surface of the permeable soil layer, and fill the impermeable soil layers on the anti-seepage geotextiles. The surface is set into a step structure from bottom to top, and a permeable fill layer is also set at the entire bottom of the steps of each impervious fill layer;

d. An anchoring system is installed on the slope of the impervious fill layer at the lower part of the slope of the bank protection foundation to anchor the impermeable fill layer.

Based on the above technical solutions, the advantages of the present invention are:

The present invention is composed of a soil filling interface step, a permeable soil filling layer, an impermeable soil filling layer, and an anchoring system, and forms a filling soil that guarantees the stability of the bank slope of the coastal waterfront reservoir and at the same time generates new land with an area of "B × the length of the bank protection project". structure. In the invention, a soil filling interface step is arranged and drainage holes are arranged on the slope surface of the step, and a permeable soil filling layer is covered in the step excavation area of the filling soil interface. It solves the problem of low bonding strength between the land-forming fill structure and the original slope surface of the bank slope. The backfill is covered on the interface steps, which solves the problem of synchronous drainage of the bank slope in the process of the reservoir water level falling, and eliminates the adverse effect of groundwater infiltration on the stability of the fill structure. An anchoring system is set on the layer slope to anchor the impervious fill layer, which solves the overall stability of the fill bank slope.

The invention provides a filling structure which can not only ensure the stability of the bank slope of the coastal reservoir, but also increase the land. Compared with the traditional bank protection structure, the invention can not only effectively protect the stability of the bank slope of the coastal reservoir, but also can well protect the geological environment of the coastal reservoir and promote the development and utilization of land resources on the bank slope.

Description of drawings

In order to illustrate the technical solutions in the specific embodiments of the present invention more clearly, the following will briefly introduce the accompanying drawings that are required to be used in the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. In the drawings, each element or section is not necessarily drawn to actual scale.

Fig. 1 is the structural representation of the present invention;

In the attached drawings: 1-bank slope soil; 2-bank protection foundation slope; 3-potential damage surface of bank slope; 4-fill interface step; 5-drainage hole; 6-impervious filling layer; 7-permeable filling Soil layer; 8-traditional bank protection slope line; 9-anchor rod grid hook; 10-anchor rod; 11-impermeable geotextile; 12-low water level; 13-high water level.

Detailed ways

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

In this embodiment, the azimuth or positional relationship indicated by the terms "upper", "bottom", "left", "right", "front", "rear", "upper end", "lower end", etc. are based on the azimuth or positional relationship shown in the accompanying drawings, It is only for the convenience of description, rather than indicating or implying that the referred device or element must have a particular orientation, be constructed or operate in a particular orientation, and therefore should not be construed as a limitation of the present invention.

Example 1

As shown in FIG. 1 , the present invention provides a revetment structure of coastal waterfront reservoir building type, comprising a filling interface step 4 arranged along the bank protection foundation slope 2 , and a permeable soil filling layer 7 covering the filling interface step 4 . 2. The impermeable fill layer 6 covering the permeable fill layer 7; the impermeable fill layer 6 is arranged into a multi-level step structure from bottom to top along the bank protection foundation slope 2, and the impermeable fill layer 6 is arranged at each level. The entire bottom of the soil step is also provided with a permeable soil filling layer 7; an anti-seepage geotextile 11 is provided between the permeable soil filling layer and the impermeable soil filling layer; the permeable soil filling layer 7 is made of sand and gravel The impervious filling layer 6 is formed by layered filling of cohesive soil.

Further, the slope angle θ of the step 4 at the filling interface is 30°, the width of the step plate is 100 cm, and a drainage hole 5 is provided on the slope surface of the filling interface step, and the drainage hole 5 is connected to the step. The included angle of the slope bottom line is 10°～30°.

Further, the permeable soil filling layer 7 is formed by filling and compacting with sand and gravel, and the compaction degree is not less than 85%.

Further, the impermeable soil filling layer 6 is formed by layered filling and compaction of cohesive soil, the layered thickness is 20-30 cm, and the compaction degree is not less than 85%.

Further, the step height h of the impermeable filling layer is 300-500cm, the width a of the step plate is 200cm, and the width of the upper plate of the last step from bottom to top along the revetment foundation slope is B.

Further, the thickness of the permeable soil layer at the bottom of the steps of each impermeable soil layer is 30-50cm.

Further, the revetment structure of the coastal waterfront reservoir construction type also includes an anchoring system, and the anchoring system includes an anchor rod 10 and an anchor rod lattice hook 9, and the impervious filling layer step slope at the lower part of the bank protection foundation slope 2 is provided. The anchor rod 10 is fixed on the surface, and the anchor rod is anchored in the bank slope soil body 1; A solid connection to the surface.

Example 2

The present invention also provides a method for building a waterfront bank revetment structure, comprising the following steps:

a. Determine the building position of the bank protection structure according to the geological and geomorphological conditions of the Binhai Reservoir.

b. Excavate a soil-fill interface step along the slope of the bank protection foundation at the building site, set drainage holes on the slope of the step, and cover the permeable soil fill layer on the soil-fill interface step, and the permeable soil layer is made of sand and gravel according to the The relevant national technical standards are filled with compaction and the degree of compaction is not less than 85%.

c. Lay anti-seepage geotextiles on the surface of the permeable soil layer, and fill the impermeable soil layers on the anti-seepage geotextiles. The surface is arranged in a step structure from bottom to top, and a permeable filling layer is also arranged at the entire bottom of the steps of each impervious filling layer.

Specifically, build the steps from bottom to top along the slope of the revetment foundation: use sand and gravel to backfill and compact the backfill interface step → cover a layer of sand and gravel to integrate with the backfilled sand and gravel → in the impermeable Cover the bottom of the steps of the filling layer with a layer of sand and gravel → lay an impermeable geotextile on the surface of the sand and gravel layer → use cohesive soil to fill the impermeable soil layer on the impermeable geotextile.

d. An anchoring system is installed on the slope of the impervious fill layer at the lower part of the slope of the bank protection foundation to anchor the impermeable fill layer.

The present invention is composed of a filling interface step 4, a permeable filling layer 7, an impermeable filling layer 6, and an anchoring system, forming an area to ensure the stability of the bank slope of the coastal reservoir and at the same time generate new land with an area of "B × the length of the bank protection project" fill structure. In this invention, a filling interface step 4 is provided and drainage holes 5 are arranged on the slope surface of the step. The excavation area of the filling interface step is covered with a permeable filling layer 7. The permeable filling layer uses sand and gravel to excavate the filling interface step. Backfilling and compaction in the area solves the problem of low bond strength between the landfill structure and the original slope surface of the bank slope; , and the permeable fill layer 7 is backfilled and covered on the fill interface step 4, which solves the problem of synchronous drainage of the bank slope during the process of the reservoir water level falling, and eliminates the adverse effect of groundwater infiltration on the stability of the fill structure; An anchoring system is set on the slope of the impervious fill layer 6 at the lower part of the foundation slope 2 to anchor the impermeable fill layer, which solves the problem of the overall stability of the fill bank slope.

As shown in Figure 1, if the traditional bank protection slope line 8 is used, the bank protection structure will not be able to add new land; and the alternating change of the low water level 12 and the high water level 13 of the reservoir (reservoir water level change) will easily lead to erosion and scouring of the traditional bank protection slope line 8, and the banks The slope potential damage surface 3 is vulnerable to damage. Compared with the traditional bank protection structure, the present invention provides a filling structure which can not only ensure the stability of the bank slope of the coastal reservoir, but also increase the land. The invention can not only effectively protect the stability of the bank slope of the coastal waterfront reservoir, but also can well protect the geological environment of the coastal waterfront reservoir and promote the development and utilization of land resources on the bank slope.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand; Modifications are made to the technical solutions recorded in the foregoing embodiments, or some or all of the technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. It should be covered within the scope of the claims and description of the present invention.

Claims (7)

1. A shoreline reservoir building type revetment structure is characterized in that: comprising a filling interface step set along the bank protection foundation slope, a permeable soil filling layer covering on this filling interface step, covering on the permeable filling The impermeable filling layer on the soil layer; the impervious filling layer is arranged from bottom to top along the slope of the bank protection foundation into a multi-step step structure, and a permeable filling layer is also arranged at the entire bottom of the steps of each impervious filling layer. Soil layer; anti-seepage geotextiles are arranged between the permeable filling layer and the impermeable filling layer; the permeable filling layer is filled with sand and gravel, and the impermeable filling layer is made of viscous The soil is layered and filled; It also includes an anchoring system, the anchoring system includes an anchor rod and an anchor rod lattice hook, the anchor rod is fixed on the step slope of the impermeable filling layer at the lower part of the slope of the revetment foundation, and the anchor rod is anchored on the bank slope. The anchor rod grid hook is hooked on the stepped slope of the impermeable filling layer to form a stable connection between the anchor rod and the stepped slope surface of the impermeable filling layer. 2. The revetment structure of coastal waterfront reservoir building type according to claim 1, characterized in that: the slope angle θ of the step at the filling interface is 30°, the width of the step plate is 100cm, and the step at the filling interface is 100cm wide. Drainage holes are arranged on the slope, and the included angle between the drainage holes and the bottom line of the step slope is 10°˜30°. 3 . The revetment structure for coastal waterfront reservoirs according to claim 1 , wherein the permeable filling layer is formed by filling and compacting sand and gravel, and the compaction degree is not less than 85%. 4 . 4. The revetment structure of coastal waterfront reservoir building according to claim 1, characterized in that: the impervious filling layer is formed by layered filling and compaction of cohesive soil, and the layered thickness is 20-30cm, The degree of compaction is not less than 85%. 5. The revetment structure of coastal waterfront reservoir building type according to claim 1, wherein the step height h of the impervious filling layer is 300-500cm, and the width a of the step plate is 200cm, along the slope of the bank protection foundation. The width B of the upper flat plate of the last step from bottom to top is 300-600cm. 6 . The revetment structure for coastal waterfront reservoirs according to claim 1 , wherein the thickness c of the permeable filling layer at the bottom of the steps of each impermeable filling layer is 30-50 cm. 7 . 7. a method for building the shoreline bank revetment structure described in any one of claims 1-6, is characterized in that, comprises the steps: a. Determine the building position of the bank protection structure according to the geological and geomorphological conditions of the coastal reservoir; b. Excavate a soil-fill interface step along the slope of the bank protection foundation at the building site, set drainage holes on the slope of the step, and cover the permeable soil fill layer on the soil-fill interface step, and the permeable soil layer is made of sand and gravel according to the The relevant national technical standards are filled with compaction, and the compaction degree is not less than 85%; c. Lay anti-seepage geotextiles on the surface of the permeable soil layer, and fill the impermeable soil layers on the anti-seepage geotextiles. The surface is set into a step structure from bottom to top, and a permeable fill layer is also set at the entire bottom of the steps of each impervious fill layer; d. An anchoring system is installed on the slope of the impervious fill layer at the lower part of the slope of the bank protection foundation to anchor the impermeable fill layer.

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