阅读说明：本技术 土质防渗体堆石坝基础廊道与防渗墙的连接结构 (Connection structure of soil impervious body rock-fill dam foundation gallery and impervious wall ) 是由 曹艳辉 熊泽斌 王汉辉 易路 万云辉 邹德兵 闵征辉 胡建明 王杰 张骏 于 2021-07-08 设计创作，主要内容包括：本发明公开了一种土质防渗体堆石坝基础廊道与防渗墙的连接结构,涉及水利水电工程技术领域。它包括土质防渗体、基础廊道和覆盖层；基础廊道通过倒梯形混凝土衔接段与混凝土防渗墙连接,基础廊道周围设置高塑性黏土区；倒梯形混凝土衔接段位于高塑性黏土区内。本发明防渗安全、可靠,适应变形能力强,设计简洁且便于施工,可适用于各类土质防渗体堆石坝基础廊道与防渗墙的连接。(The invention discloses a connecting structure of a foundation gallery and an impervious wall of a soil impervious body rock-fill dam, and relates to the technical field of hydraulic and hydroelectric engineering. It comprises a soil seepage-proofing body, a basic gallery and a covering layer; the foundation gallery is connected with the concrete impervious wall through the inverted trapezoidal concrete connecting section, and a high-plasticity clay area is arranged around the foundation gallery; the inverted trapezoidal concrete joining section is located in the high-plasticity clay area. The invention has safe and reliable seepage prevention, strong adaptive deformation capability, simple design and convenient construction, and is suitable for the connection of the foundation gallery and the seepage-proof wall of the rock-fill dam of various soil seepage-proof bodies.)

1. Soil property prevention of seepage body rock-fill dam basis corridor and impervious wall's connection structure, its characterized in that: comprises a soil seepage-proofing body (1), a basic gallery (2) positioned in the soil seepage-proofing body (1), and a covering layer (3) positioned below the soil seepage-proofing body (1);

the upper half part of the section body of the basic gallery (2) adopts a half elliptic curve, the long semi-axis of the elliptic curve is in the vertical direction, the short semi-axis of the elliptic curve is in the direction along the water flow, the bottom of the basic gallery (2) is connected with a concrete impervious wall (4) in the covering layer (3) through an inverted trapezoidal concrete connecting section (21), and a high-plasticity clay area (5) is arranged around the basic gallery (2); the inverted trapezoidal concrete joining section (21) is located in the high-plasticity clay area (5).

2. The connecting structure of the foundation gallery of the earth impervious body rock-fill dam and the impervious wall according to claim 1, wherein: the basic gallery (2) is connected with the inverted trapezoidal concrete joining section (21) through a structural seam (22); and the structural gap (22) is filled with rubber cushion block gap materials (221).

3. The connecting structure of the foundation gallery of the earth impervious body rock-fill dam and the impervious wall according to claim 2, wherein: the structural seam (22) is provided with a first longitudinal copper water stop (222) close to the upstream side and a second longitudinal copper water stop (223) close to the downstream side.

4. The structure for connecting a foundation gallery and an impervious wall of a soil impervious body rock-fill dam according to claim 3, wherein: the first longitudinal copper water stop (222) and the second longitudinal copper water stop (223) are continuously arranged along the axial direction of the basic gallery (2).

5. The connection structure of the foundation gallery of the earth impervious body rock-fill dam and the impervious wall according to claim 4, wherein: the width of the upper bottom of the section of the inverted trapezoidal concrete joining section (21) is the same as the width of the bottom of the foundation gallery (2), and the width of the lower bottom of the section of the inverted trapezoidal concrete joining section (21) is the same as the thickness of the concrete impervious wall (4).

6. The connecting structure of the foundation gallery of the earth impervious body rock-fill dam and the impervious wall according to claim 7, wherein: the elastic modulus of the rubber cushion block gap material (221) is not more than 2 MPa.

Technical Field

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a connecting structure of a foundation gallery and an impervious wall of a rock-fill dam with a soil impervious body.

Background

With the continuous promotion of the development process of water conservancy and hydropower in China, rivers of the great river where a plurality of water resource development bases are located face deep coverage layers, and particularly, deep coverage layers exist in western regions of China, such as main streams of the great river, middle and upstream streams of Jinsha river, Tibet and Xinjiang river, and the like.

In the 21 st century, the technology of building dams by using covering layers is further improved, a batch of high earth-rock dams with the height of more than 100m are built on the deep covering layers, and meanwhile, a batch of high earth-rock dams with the height of 200m built on the deep covering layers are also being built or designed. The seepage stability and the seepage loss of a dam foundation of the earth-rock dam built on the deep covering layer are main problems to be solved by the seepage control of the dam foundation, the vertical seepage prevention is a reliable means for effectively solving the problems, and most of the earth-rock dams built on the covering layer adopt a seepage control measure mainly for vertical seepage prevention or vertical seepage prevention at present.

In earth and rockfill dams built on covering layers, vertical seepage-proofing measures such as a seepage-proofing wall or a curtain connected below the seepage-proofing wall are adopted, and seepage-proofing bodies and seepage-proofing walls of earth and rockfill dams with the height of 100m-200m built on the covering layers are generally connected by arranging a foundation gallery and the seepage-proofing bodies on the top of the seepage-proofing walls, namely a gallery type connection mode. The foundation gallery and the impervious wall in the existing high earth-rock dam engineering built on the deep overburden layer are generally directly connected, namely a rigid connection type is adopted, the dam body is high and the overburden layer is deep, the stress properties of the foundation gallery and the impervious wall are very complex, the calculated compressive stress and tensile stress of the foundation gallery and the impervious wall adopting the rigid connection type are usually large, the structural design requirements on the foundation gallery and the impervious wall and the design requirements on the connection structure between the foundation gallery and the impervious wall are high, and the connection structure belongs to one of main weak parts of dam foundation seepage prevention. The problems of water leakage and the like caused by the cracking of the basic gallery occur in the operation process of the built part of engineering, and the safe and stable operation of the engineering is influenced.

Therefore, it is necessary to develop a connection structure for the foundation gallery and the impervious wall of the earth impervious body rock-fill dam.

Disclosure of Invention

The invention aims to overcome the defects of the background technology and provide a connecting structure of a foundation gallery and an impervious wall of a rock-fill dam with a soil impervious body.

In order to achieve the purpose, the technical scheme of the invention is as follows: soil property prevention of seepage body rock-fill dam basis corridor and impervious wall's connection structure, its characterized in that: comprises a soil seepage-proofing body, a basic gallery positioned in the soil seepage-proofing body and a covering layer positioned below the soil seepage-proofing body;

the upper half part of the section body of the basic gallery adopts a half elliptic curve, the long semi-axis of the elliptic curve is in the vertical direction, the short semi-axis of the elliptic curve is in the direction along the water flow, the bottom of the basic gallery is connected with a concrete impervious wall in the covering layer through an inverted trapezoidal concrete connecting section, and a high-plasticity clay area is arranged around the basic gallery; the inverted trapezoidal concrete joining section is located in the high-plasticity clay area.

In the technical scheme, the basic gallery is connected with the inverted trapezoidal concrete joining section through a structural seam; and the structural seams are filled with rubber cushion block seam isolating materials.

In the technical scheme, the structural joint is provided with a first longitudinal copper water stop close to the upstream side and a second longitudinal copper water stop close to the downstream side.

In the above technical scheme, the first longitudinal copper water seal and the second longitudinal copper water seal are both continuously arranged along the axial direction of the basic gallery.

In the technical scheme, the width of the upper bottom of the section of the inverted trapezoidal concrete joining section is the same as the width of the bottom of the foundation gallery, and the width of the lower bottom of the section of the inverted trapezoidal concrete joining section is the same as the thickness of the concrete impervious wall.

In the technical scheme, the elastic modulus of the rubber cushion block gap material is not more than 2 MPa.

Compared with the prior art, the invention has the following advantages:

1) the invention has safe and reliable seepage prevention, strong adaptive deformation capability, simple design and convenient construction, and is suitable for the connection of the foundation gallery and the seepage-proof wall of the rock-fill dam of various soil seepage-proof bodies.

2) According to the invention, the inverted trapezoidal concrete connecting section is arranged between the foundation gallery and the concrete impervious wall, the structural joint is arranged between the inverted trapezoidal concrete connecting section and the foundation gallery, and the rubber cushion block parting joint material is filled, so that the overlying load transmitted to the concrete impervious wall through the foundation gallery is reduced, the stress concentration at the top of the concrete impervious wall is reduced, and the stress condition of the concrete impervious wall and the foundation gallery is improved.

3) The upper half part of the section of the foundation gallery adopts a half elliptic curve body type, and the high-plasticity clay area is arranged around the connection section of the foundation gallery and the inverted trapezoidal concrete, so that the overlying load transmitted to the foundation gallery due to dam filling is reduced, and the stress condition of the concrete impervious wall and the foundation gallery is favorably improved.

4) According to the invention, the first longitudinal copper water stop and the second longitudinal copper water stop are arranged in the structural joint, so that the seepage-proofing reliability of the structural joint is enhanced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The construction method comprises the following steps of 1-a soil seepage-proofing body, 2-a foundation gallery, 21-an inverted trapezoidal concrete connection section, 22-a structural joint, 221-a rubber cushion block gap material, 222-a first longitudinal copper water stop, 223-a second longitudinal copper water stop, 3-a covering layer, 4-a concrete seepage-proofing wall and 5-a high-plasticity clay area.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.

With reference to the accompanying drawings: soil property prevention of seepage body rock-fill dam basis corridor and impervious wall's connection structure, its characterized in that: comprises a soil seepage-proofing body 1, a basic gallery 2 positioned in the soil seepage-proofing body 1 and a covering layer 3 positioned below the soil seepage-proofing body 1;

the upper half part of the section body of the basic gallery 2 adopts a half elliptic curve, the long semi-axis of the elliptic curve is in the vertical direction, the short semi-axis of the elliptic curve is in the direction along the water flow, the bottom of the basic gallery 2 is connected with a concrete impervious wall 4 in the covering layer 3 through an inverted trapezoidal concrete connecting section 21, and a high-plasticity clay area 5 is arranged around the basic gallery 2; the inverted trapezoidal concrete joining section 21 is positioned in the high-plasticity clay area 5; the invention has safe and reliable seepage prevention, strong adaptive deformation capability, simple design and convenient construction, and can be suitable for the connection between the foundation gallery of the rock-fill dam and the seepage-proof wall of various soil seepage-proof bodies; the upper half part of the section of the foundation gallery 2 adopts a half elliptic curve, and the high-plasticity clay area 5 is arranged around the foundation gallery 2 and the inverted trapezoidal concrete connecting section 21, so that the overlying load transmitted to the foundation gallery 2 due to dam filling is reduced, and the stress condition of the concrete impervious wall 4 and the foundation gallery 2 is favorably improved.

The basic gallery 2 is connected with the inverted trapezoidal concrete joining section 21 through a structural seam 22; the structural joint 22 is filled with rubber cushion block gap materials 221; an inverted trapezoidal concrete joining section 21 is arranged between the foundation gallery 2 and the concrete impervious wall 4, a structural joint 22 is arranged between the inverted trapezoidal concrete joining section 21 and the foundation gallery 2, and a rubber cushion block gap material 221 is filled, so that the overlying load transmitted to the concrete impervious wall 4 through the foundation gallery 2 is reduced, the stress concentration at the top of the concrete impervious wall 4 is reduced, and the stress conditions of the concrete impervious wall 4 and the foundation gallery 2 are improved.

The structural joint 22 is provided with a first longitudinal copper water stop 222 close to the upstream side and a second longitudinal copper water stop 223 close to the downstream side, so that the seepage-proofing reliability of the structural joint 22 is enhanced.

The first longitudinal copper water stop 222 and the second longitudinal copper water stop 223 are both continuously arranged along the axial direction of the basic gallery 2.

The width of the upper bottom of the section of the inverted trapezoidal concrete joining section 21 is the same as the width of the bottom of the basic gallery 2, and the width of the lower bottom of the section of the inverted trapezoidal concrete joining section 21 is the same as the thickness of the concrete impervious wall 4.

The rubber cushion block crack material 221 has low elastic modulus and compressibility, and the elastic modulus of the rubber cushion block crack material 221 is not more than 2 MPa.

Other parts not described belong to the prior art.