CN107761668A - A kind of strand Bin Ku makes ground type bank protection structure and its construction process - Google Patents

Abstract

The invention provides a bank revetment structure for seashore reservoir land formation, which comprises a filling interface step arranged along the bank revetment foundation slope, a permeable filling layer covering the filling interface step, a permeable filling layer covering the The impermeable fill layer on the top; the impermeable fill layer is arranged in a multi-level step structure from bottom to top along the revetment foundation slope, and a permeable fill layer is also arranged at the entire bottom of each step of the impermeable fill layer An anti-seepage geotextile is 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 cohesive soil Filled in layers. The invention forms a filling structure that guarantees the stability of the bank slope of the coastal reservoir and adds land at the same time, effectively protects the geological environment of the coastal reservoir zone, and promotes the development and utilization of bank slope land resources.

Description

A bank revetment structure and its construction method

technical field

The invention relates to the field of bank revetment design and construction of a coastal reservoir, in particular to a bank revetment structure and construction method for a coastal reservoir.

Background technique

In the past 30 years, in order to vigorously develop hydropower resources, take into account flood control needs and regional water resources allocation, a large number of large and super 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 related not only 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 my country's coastal reservoirs. For example, there are more than 60 urban market towns in the Three Gorges reservoir area, including Badong, Zigui, Yichang, Wushan, Fengjie, Kaizhou, Yunyang, Wanzhou, Zhongxian, and Fengdu. In the Binku area, the number of residents exceeds 10 million. As a high-incidence area of geological disasters, the infrastructure construction of coastal reservoir cities and the management of slope geological hazards must be highly integrated and coordinated.

The slope revetment structure is to lay building materials or components directly on the embankment or the slope facing the beach to form a continuous covering layer to prevent erosion and erosion by water flow and wind and waves. This form of protection is arranged along the direction of water flow, which has little impact on water flow and does not affect shipping, so it is widely used. The river regime in the middle and lower reaches of the Yangtze River in China is relatively stable, and slope-type revetments are widely used in places with deep water, dangerous embankments, important cities, and ports. However, in order to control the river regime and the flood control safety of the coastal reservoir, the slope-type revetment structure in the prior art focuses on the structural design of using hard materials such as block stones and concrete, which leads to serious revetment hardening, and the hardened revetment structure destroys the river bed. The connection with the river bank ecosystem cuts off the contact between the organisms and microorganisms in the water and the land area. At the same time, the hardened river bank prevents the growth of aquatic plants and seriously affects the ecosystem of the coastal reservoir. In addition, the conventional hard revetment structure also It may cause the transfer of scour and erosion problems, weaken the ability of coastal rivers to reduce flow energy, and cause more serious erosion downstream.

Aiming at the stability and safety of the bank slope in the project control area, the design and construction of bank slope protection engineering from the perspective of geological disaster control is the only technical path for the prevention and control of bank slope geological disasters at home and abroad. However, the control project cannot meet the development and utilization of land resources in the control area. It even brings many unfavorable factors to the follow-up urban infrastructure construction. In other words, the integration of geological hazard management and land resource development and utilization of coastal reservoir slopes has important practical significance.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a bank revetment structure and its construction method to form a bank slope stability of the bank bank and generate new land with an area of "B × length of revetment project". Fill structure.

In order to achieve the above object, the present invention provides a bank revetment structure for seashore reservoir land formation, the key of which is: comprising the filling interface steps arranged along the bank revetment foundation slope, the permeable filling layer covering the filling interface steps, covering The impermeable fill layer on the permeable fill layer; the impermeable fill layer is arranged into a multi-level step structure from bottom to top along the slope of the bank revetment foundation, at the entire bottom of each step of the impermeable fill layer A permeable filling layer is also provided; an anti-seepage geotextile is arranged between the permeable filling layer and the impermeable filling layer; the permeable filling layer is filled with sand and gravel, and the impermeable The filling layer is formed by filling layers of cohesive soil.

Further, the step slope angle θ of the filling interface is 30°, the width of the flat plate of the step is 100cm, and drainage holes are arranged on the step slope of the filling interface, and the distance between the drainage holes and the bottom line of the step slope is The included angle is 10°～30°.

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

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

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

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

Further, it also includes an anchoring system, the anchoring system includes an anchor rod and an anchor rod grid hook, and the anchor rod is fixed on the step slope of the impermeable fill layer at the lower part of the revetment foundation slope, and the anchor rod is anchored In the soil mass of the bank slope; the anchor bar grid hook is hung on the step slope of the impermeable filling layer to form a stable connection between the anchor rod and the step slope of the impermeable filling layer.

Another object of the present invention is to provide a kind of method for the construction of seashore reservoir land-making type bank revetment structure, and its key lies in, comprises steps:

a. Determine the building position of the revetment structure according to the geological and landform conditions of the coastal reservoir;

b. Excavate the filling interface step along the bank revetment foundation slope at the building site, set drainage holes on the step slope, cover the permeable filling layer on the filling interface step, and use sand and gravel for the permeable filling layer The relevant national technical standards shall be filled and compacted, and the compaction degree shall not be less than 85%;

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

d. Set up an anchor system on the slope of the impermeable fill layer at the lower part of the revetment foundation slope to anchor the impermeable fill layer.

Based on above-mentioned technical scheme, advantage of the present invention is:

The invention consists of filling interface steps, permeable filling layers, impermeable filling layers, and an anchoring system to form a filling that ensures the stability of the bank slope of the coastal reservoir and simultaneously generates new land with an area of "B × bank revetment length". structure. In the invention, a step is provided at the filling interface, and drainage holes are arranged on the slope of the step, and the excavation area of the step at the filling interface is covered with a permeable filling layer, and the permeable filling layer uses sand and gravel to backfill and press the excavation area of the step at the filling interface. It solves the problem of low bond strength between the land-forming filling structure and the original slope surface, and sets the land-forming filling body into a permeable filling layer and an impermeable filling layer, and the permeable filling Layer backfill covers the interface steps, which solves the problem of synchronous drainage of the bank slope during the decline of the reservoir water level, and eliminates the adverse effect of groundwater seepage on the stability of the fill structure. An anchoring system is set on the layer slope to anchor the impermeable fill layer, which solves the overall stability problem of the fill bank slope.

The invention provides a soil filling structure that can not only ensure the stability of the bank slope of the seaside reservoir, but also increase the land. Compared with the traditional revetment 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 of the bank slope.

Description of drawings

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

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

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

Detailed ways

Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

In this embodiment, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "upper end" and "lower end" are based on the orientation or positional relationship shown in the drawings, It is for the convenience of description only, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, or operate, and thus should not be construed as limiting the present invention.

Example 1

As shown in Fig. 1, the present invention provides a bank revetment structure for seaside reservoir land formation, including a fill interface step 4 arranged along the bank revetment foundation slope 2, and a permeable fill layer 7 covering the fill interface step 4 , the impermeable fill layer 6 covered on the permeable fill layer 7; the impermeable fill layer 6 is set into a multi-level step structure from bottom to top along the revetment foundation slope 2, and the impermeable fill layer at each level The entire bottom of the soil step is also provided with a permeable filling layer 7; an anti-seepage geotextile 11 is arranged between the permeable filling layer and the impermeable filling layer; the permeable filling layer 7 is made of sand and gravel It is formed by filling, and the impermeable filling layer 6 is formed by filling layers of cohesive soil.

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

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

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

Further, the step height h of the impermeable filling layer is 300-500cm, the width a of the flat plate of the step 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 fill layer at the bottom of each step of the impermeable fill layer is 30-50 cm.

Further, the bank revetment structure also includes an anchor system, the anchor system includes an anchor rod 10 and an anchor rod grid hook 9, and the step slope of the impermeable fill layer at the lower part of the bank revetment foundation slope 2 The anchor rod 10 is fixed on the surface, and the anchor rod is anchored in the bank slope soil 1; A solid connection to the surface.

Example 2

The present invention also provides a method for constructing a bank revetment structure for a seaside reservoir, comprising the following steps:

a. Determine the building position of the revetment structure according to the geological and landform conditions of the coastal reservoir.

b. Excavate the filling interface step along the bank revetment foundation slope at the building site, set drainage holes on the step slope, cover the permeable filling layer on the filling interface step, and use sand and gravel for the permeable filling layer The relevant national technical standards shall be filled and compacted, and the degree of compaction shall not be less than 85%.

c. Lay anti-seepage geotextile on the surface of the permeable fill layer, and fill the impermeable fill layer on the anti-seepage geotextile. The surface is set into a stepped structure from bottom to top, and a permeable fill layer is also set on the entire bottom of each step of the impermeable fill layer.

Specifically, build land-forming steps step by step along the bank revetment foundation slope from bottom to top: use sand and gravel to backfill and compact the steps at the filling interface → cover with a layer of sand and gravel and blend with the backfilled sand and gravel → in the impermeable The bottom of the steps of the filling layer is covered with a layer of sand and gravel → the anti-seepage geotextile is laid on the surface of the sand and gravel layer → the impermeable fill layer is filled with clay layers on the anti-seepage geotextile.

d. Set up an anchor system on the slope of the impermeable fill layer at the lower part of the revetment foundation slope to anchor the impermeable fill layer.

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

As shown in Figure 1, if the traditional revetment line 8 is adopted, the bank revetment structure will not be able to add new land; and the low water level 12 and high water level 13 of the reservoir alternately change (reservoir water level changes) which will easily lead to erosion and erosion of the traditional revetment line 8, and the bank slope potential Failure surface 3 is vulnerable to failure. Compared with the traditional revetment structure, the present invention provides a filling structure that can not only ensure the stability of the bank slope of the coastal reservoir, but also increase the land. The invention not only can 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.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than 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; it still can Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. It should be included within the scope of the claims and description of the present invention.

Claims (8)

1. A land-making bank revetment structure for seashore reservoirs, characterized in that: comprising a fill interface step arranged along the bank revetment foundation slope, a permeable fill layer covering the fill interface step, covering the permeable fill The impervious fill layer on the soil layer; the impermeable fill layer is arranged in a multi-level step structure from bottom to top along the revetment foundation slope, and a permeable fill layer is also arranged at the entire bottom of each step of the impermeable fill 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 The soil is filled in layers. 2. The bank revetment structure according to claim 1, characterized in that: the slope angle θ of the step at the filling interface is 30°, the width of the flat plate of the step is 100 cm, and the step at the filling interface 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 bank revetment structure according to claim 1, characterized in that: the permeable filling layer is compacted by sand and gravel, and the compaction degree is not less than 85%. 4. The bank revetment structure according to claim 1, characterized in that: the impermeable filling layer is formed by layered compaction of cohesive soil, and the layered thickness is 20-30cm. The degree of compaction is not less than 85%. 5. The bank revetment structure according to claim 1, characterized in that: the step height h of the impermeable fill layer is 300-500cm, and the width a of the flat plate of the step is 200cm. The upper flat plate width B of the last step from bottom to top is 300-600cm. 6 . The bank revetment structure according to claim 1 , characterized in that: the thickness c of the permeable fill layer at the bottom of each step of the impermeable fill layer is 30-50 cm. 7. The bank revetment structure according to claim 1, characterized in that: it also includes an anchoring system, the anchoring system includes anchor rods and anchor rod grating hooks, and in the lower part of the bank revetment foundation slope The anchor rod is fixed on the step slope of the permeable filling layer, and the anchor rod is anchored in the bank slope soil; Solid connection of soil step slopes. 8. A method for building the land-building type bank revetment structure of the seaside reservoir according to any one of claims 1-7, characterized in that it comprises the steps of: a. Determine the building position of the revetment structure according to the geological and landform conditions of the coastal reservoir; b. Excavate the filling interface step along the bank revetment foundation slope at the building site, set drainage holes on the step slope, cover the permeable filling layer on the filling interface step, and use sand and gravel for the permeable filling layer The relevant national technical standards shall be filled and compacted, and the compaction degree shall not be less than 85%; c. Lay anti-seepage geotextile on the surface of the permeable fill layer, and fill the impermeable fill layer on the anti-seepage geotextile. The surface is set into a stepped structure from bottom to top, and a permeable fill layer is also set at the entire bottom of each step of the impermeable fill layer; d. Set up an anchor system on the slope of the impermeable fill layer at the lower part of the revetment foundation slope to anchor the impermeable fill layer.