CN213038325U - Layered filling structure of face dam rockfill material transition area - Google Patents

Abstract

The utility model provides a layered filling structure of panel dam rockfill material transition zone, through set up the transition zone structural style that main rockfill district and inferior rockfill district filling material layering were filled in turn between the inferior rockfill district of main rockfill district in upstream and low reaches, adopt the interbedded filling of soft or hard rockfill material, realize up, the transition of low reaches rockfill material, solved great deformation modulus difference problem between the inferior rockfill district of main rockfill district that the upper reaches is of good quality and low reaches quality difference, can avoid the processing cost problem that the independent design transition district filling material leads to, transition district filling material source scope has also been enlarged simultaneously, for a large amount of in the engineering, strong excavation material provides technical guarantee in the application of inferior rockfill district of low reaches morals and manners, and the rockfill material partition structure has been simplified, construction efficiency is improved, the engineering investment has also been saved.

Description

Layered filling structure of face dam rockfill material transition area

Technical Field

The utility model belongs to the technical field of water conservancy, hydroelectric engineering technique and specifically relates to a panel dam rock-fill dam transition zone project organization is related to.

Background

In the design of the concrete faced rockfill dam, the upstream main rockfill area is used as a carrier of upstream water load, and simultaneously supports the face plates to avoid tensile crack damage caused by dam body deformation, so that the upstream main rockfill area is generally filled by weak weathering or slightly new rock rockfill with good quality. For the secondary rockfill area downstream of the main rockfill, on one hand, because the actual engineering does not always have enough good rockfill for the downstream rockfill area under the condition of meeting the condition that the upstream rockfill adopts good-quality rockfill, on the other hand, a large amount of fully and strongly weathered excavation materials are used as waste slag of useless materials in the engineering. In order to fully utilize engineering excavation waste materials and save engineering investment, poor-quality completely and strongly weathered excavation materials are often adopted as filling materials of a downstream secondary rockfill area of the rockfill dam in the design. Therefore, the large difference of the deformation modulus between the main rockfill area with good upstream quality and the secondary rockfill area with poor downstream quality exists, a transition area needs to be arranged between the main rockfill area and the secondary rockfill area, the uniform transition of the deformation modulus from the upstream to the downstream is realized, and the influence of the uneven deformation of the dam on the stability and the safety of the dam under the load action is avoided. The transition area which is independently arranged under the common condition needs to provide special design requirements for the rockfill material, and the construction is separately partitioned and filled, so that the construction is complex, the efficiency is low, and the investment is increased. Therefore, how to realize a transition area which is safe, reliable, simple in structure, high in construction efficiency and low in investment between a main rockfill area with good quality and a secondary rockfill area with poor quality in the rockfill dam has important engineering significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a need not the independent design construction under the inferior rockfill district condition that quality is poor is adopted with low reaches to the main rockfill district that panel rock-fill dam upper reaches adopted the good quality, and through by the main rockfill district in upper reaches and the lower reaches time rockfill district alternate, the transition district filled structure that the integration construction formed realizes the deformation modulus transition between the inferior rockfill district in upper and lower reaches.

To this end, the above object of the present invention is achieved by the following technical solutions:

a layered filling structure of a face dam rockfill material transition region is composed of an upstream main rockfill region, a middle transition region and a downstream secondary rockfill region; the method is characterized in that: the middle transition area between the main rockfill area and the secondary rockfill area is not designed with filling materials independently, but is formed by alternately filling rockfill materials in the main rockfill area and rockfill materials in the secondary rockfill area in a layered mode, and transition between the upstream main rockfill area and the downstream secondary rockfill area is achieved through layered filling of soft and hard rockfill materials.

The rockfill material of the upstream main rockfill area has better quality and higher deformation modulus than the rockfill material of the downstream secondary rockfill area, and is generally filled by weakly weathered or slightly new rockfill materials or filled by any proportion of the weakly weathered or slightly new rockfill materials. The rock (soil) mass of the downstream secondary rockfill area is poor, the deformation model is low, one or any two or all three of fully weathered stones, strongly weathered stones and gravel stones are generally adopted for filling, and when mixed stones are adopted, the proportion is random.

The middle transition area meets the structural requirement of transition between the upstream rockfill area and the downstream rockfill area, filling and rolling construction is considered, and the horizontal width of the middle transition area is set to be 6-10 m.

The middle transition region has a certain slope ratio with the connection boundary of the upstream main rockfill region and the downstream secondary rockfill region, and the boundary of the transition region and the upstream main rockfill region and the boundary of the downstream secondary rockfill region are inclined in the upstream direction in general; from the perspective of construction convenience, the connection and boundary comprehensive slope ratio of the intermediate transition region, the upstream main rockfill region and the downstream secondary rockfill region is preferably set to be 1: 0.5.

The main rockfill partition layer filling thickness is 2 times of the secondary rockfill partition layer thickness, the main rockfill partition layer thickness is 0.8-1.0 m, and the secondary rockfill partition layer thickness is 0.4-0.5 m.

The main rockfill material layer paved in the transition region is embedded into the downstream secondary rockfill region, and the secondary rockfill material layer paved in the transition region is embedded into the upstream main rockfill region, so that a layered mutually embedded structure of soft and hard rockfill materials is formed.

The utility model provides a layered filling structure of panel dam rockfill material transition zone, through set up the transition zone structural style that main rockfill district and inferior rockfill district filling material layering were filled in turn between the inferior rockfill district of main rockfill district in upstream and low reaches, adopt the interbedded filling of soft or hard rockfill material, realize the transition of upper and lower reaches rockfill material, solved the main rockfill district that the upper reaches is of high quality and the inferior rockfill district of low reaches quality difference problem of great deformation modulus between. By adopting the structural style of the transition area in which the upstream main rockfill material and the downstream secondary rockfill material are alternately filled in a layered mode, the problem of processing cost caused by independently designing the transition area rockfill material can be avoided, the source range of the transition area rockfill material is expanded, and the technical guarantee is provided for the application of a large amount of completely and strongly weathered excavation materials in the downstream rockfill area in the engineering. By adopting the structural style of the transition area which is alternatively filled by the upstream main rockfill filling material and the downstream secondary rockfill filling material in a layered mode, during filling construction, each layered actual filling material partition is only provided with two partitions, and only the boundary line of each layered filling material is constantly changed, so that the rockfill material partition structure is simplified, the construction efficiency is improved, and the engineering investment is also saved.

Drawings

Fig. 1 is a schematic view of a layered filling structure and a construction method of a face dam rockfill material transition area of the utility model.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

The utility model discloses a layered filling structure of panel dam rockfill material transition district mainly contains following part:

the rockfill area of the panel dam consists of an upstream main rockfill area 100, a transition area 200 and a downstream secondary rockfill area 300; the upstream main rockfill area 100 is filled by weakly weathered or slightly new stones or any mixture of the weakly weathered and slightly new stones and the slightly weathered stones, the downstream secondary rockfill area 300 is filled by full and strongly weathered stones or gravel stones or any mixture of the full and strongly weathered stones and the gravel stones, and the middle transition area 200 is formed by alternately filling main rockfill and secondary rockfill in a layered manner; the thickness of the layered filling of the main rockfill area is 2 times of that of the secondary rockfill area, the thickness of the main rockfill area is preferably 0.8m to 1.0m, and the thickness of the secondary rockfill area is preferably 0.4m to 0.5 m. The horizontal width of the transition zone is 6 m-10 m, and the comprehensive slope ratio A, B of the connection and boundary of the transition zone 200 with the upstream main rockfill zone 100 and the downstream secondary rockfill zone 300 is respectively set to be 1:0.5, and is generally inclined towards the upstream direction. The boundary slope ratio of the single-layer paving connection part of the main rockfill and the secondary rockfill of the transition region 300 is 1: 1.5. That is, when the main rockfill layer is laid in the transition region 200, the boundary slope ratio of the end of the downstream sub-rockfill region 300 to the downstream sub-rockfill region 300 is 1:1.5, which is indicated by reference numeral 41, and is inclined to the upstream; when the secondary rock-fill layer is laid in the transition zone 200, the ratio of the boundary slope between the end of the upstream main rock-fill zone 100 and the upstream main rock-fill zone 100, which is denoted by reference numeral 42, is 1:1.5, tending downstream.

The layered filling structure of the rockfill material transition area of the plate-face dam can be realized by adopting the following construction method:

firstly, paving a layer of main rockfill materials 1a and 1b in the range of a main rockfill area 100 and a transition area 200 at the same time, and carrying out warehouse-through rolling, wherein the thickness of a single-layer filling layer is 0.8-1 m; the main rockfill material 1b is inclined upstream at a 1:1.5 slope ratio at the end where the intermediate transition region 200 borders the secondary rockfill region 300;

step (2) then paving and rolling a secondary rockfill area 300 at the downstream of the transition area, wherein the thickness of a single-layer filling layer is 0.4-0.5 m, and after two layers of 2-1c and 2-2c secondary rockfill materials are continuously filled, the upstream rockfill area 100 and the downstream rockfill area 300 are positioned at the same layer height;

step (3) paving secondary rockfill materials in the downstream secondary rockfill area 300 and the transition area 200 at the same time, filling two layers in sequence by bin rolling, wherein the numbers of the two layers are respectively 3-1b, 3-1c, 3-2b and 3-2c, and the thickness of a single-layer filling layer is 0.4-0.5 m; the secondary rockfill material tends downstream at a 1:1.5 slope ratio at the end of the intermediate transition zone 200 bordering the primary rockfill region 100;

step (4), paving and rolling a layer of 4a main rockfill area on the upstream of the transition area 200, wherein the thickness of a single-layer filling layer is 0.8-1 m, and the upstream rockfill area, the downstream rockfill area and the middle transition area are positioned at the same layer height;

and (5) sequentially and repeatedly carrying out the construction operations of the steps (1) to (4), alternately filling in layers, and gradually raising the dam body, so that a rockfill transition region structure formed by alternately filling the main rockfill material and the secondary rockfill material in layers is formed.

The above detailed description is provided for explaining the present invention, and is only a preferred embodiment of the present invention, but not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention are within the scope of the present invention.

Claims (5)

1. A layered filling structure of a face dam rockfill material transition region is composed of an upstream main rockfill region, a middle transition region and a downstream secondary rockfill region; the method is characterized in that: the middle transition area between the main rockfill area and the secondary rockfill area is not designed with filling materials independently, but is formed by alternately filling rockfill materials in the main rockfill area and rockfill materials in the secondary rockfill area in a layered mode, and transition of the upstream main rockfill area and the downstream secondary rockfill area is achieved through alternately filling soft and hard rockfill materials in a layered mode.

2. The layered filling structure of a rockfill transition area of a panel dam according to claim 1, wherein: the horizontal width of the middle transition area is set to be 6 m-10 m.

3. The layered filling structure of a rockfill transition area of a panel dam according to claim 1, wherein: the intermediate transition region has a slope ratio with respect to the junction boundary between the upstream main rockfill region and the downstream sub-rockfill region, and the boundary between the transition region and the upstream main rockfill region and the boundary between the transition region and the downstream sub-rockfill region are inclined in the upstream direction as a whole.

4. The layered filling structure of a rockfill transition area of a panel dam according to claim 1, wherein: the main rockfill partition layer filling thickness is 2 times of the secondary rockfill partition layer thickness, the main rockfill partition layer thickness is 0.8-1.0 m, and the secondary rockfill partition layer thickness is 0.4-0.5 m.

5. The layered filling structure of a rockfill transition area of a panel dam according to claim 1, wherein: the main rockfill material layer spread in the transition region is embedded into the downstream secondary rockfill region, and the secondary rockfill material layer spread in the transition region is embedded into the upstream main rockfill region.

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