CN207568626U - A kind of tunnel structure for expansive stratum - Google Patents

Abstract

The utility model relates to a tunnel structure for expansive strata, which comprises a steel frame shotcrete primary support, a reinforced concrete arch wall lining, an inverted arch and an inverted arch filling; steel bars are arranged in the inverted arch filling above the inverted arch Grid truss; a central seepage ditch is arranged under the inverted arch. The utility model adjusts the structure of the tunnel, increases the curvature of the inverted arch of the tunnel, cancels the central ditch in the filling of the inverted arch and adds a steel grid truss, which improves the load-bearing performance of the base structure; sets the side ditch and the central seepage ditch, which can discharge the surrounding area of the tunnel The groundwater below the stratum and basement can effectively reduce the expansion deformation of the stratum and its damage to the tunnel lining structure.

Description

A tunnel structure for expansive formations

technical field

The utility model belongs to the technical field of traffic engineering, in particular to a tunnel structure for expansive formations.

Background technique

The rail surface of the double-line tunnel structure is approximately circular, the inverted arch structure is relatively flat, and its bearing capacity is worse than that of the arch, and the traditional waterproof and drainage system mainly consists of waterproof board + non-woven fabric, circumferential blind pipe, longitudinal dead pipe, drainage Consists of side ditch and central gutter. The groundwater behind the lining of the arch wall can be introduced into the side ditch of the tunnel through blind pipes, and the side ditch is connected with the central ditch through pre-buried water pipes at a certain distance, so that the water from the side ditch can be introduced into the central ditch, and finally drained from the side ditch The groundwater behind the lining arch wall is discharged out of the tunnel through the center ditch, but the groundwater under the tunnel base often cannot be discharged smoothly. For tunnels located in expansive strata, if the tunnel base is flooded all the year round, the expansive strata will swell and deform after being soaked in water for a long time and generate a huge expansion force, which will directly act on the tunnel base, resulting in excessive deformation of the tunnel base. In severe cases There will be diseases such as uplift and cracking of the filling surface of the inverted arch structure, and the uneven expansion of the expansive stratum will also cause uneven settlement of the tunnel, which seriously affects the safety of train operation, and the later maintenance is difficult and costly. Therefore, developing a new type of lining structure is an urgent problem in the construction of expansive ground tunnels.

Contents of the invention

The purpose of this utility model is to provide a tunnel structure for expansive strata, which can effectively reduce the expansive deformation of the stratum and its damage to the tunnel lining structure when used in expansive stratum tunnels.

The technical scheme adopted in the utility model is:

A tunnel structure for expansive formations, characterized in that:

The tunnel structure includes steel frame sprayed concrete initial support, reinforced concrete arch wall lining, inverted arch and inverted arch filling;

A reinforced grid truss is arranged in the invert filling above the invert;

A central seepage ditch is arranged under the inverted arch.

A waterproof layer is set between the shotcrete initial support of the steel frame and the lining of the reinforced concrete arch wall.

The inverted arch has a rise-to-span ratio of 1/6 to 1/10.

There are vertically connected side ditches on both sides of the tunnel; the side ditches are provided with drainage holes at longitudinal intervals;

The groundwater behind the lining of the tunnel arch wall and the surface water of the track bed are collected through the discharge holes to the side ditch and discharged out of the tunnel.

The central seepage ditch is arranged along the longitudinal length of the tunnel, and the top surface of the ditch body is provided with a prefabricated reinforced concrete cover plate, and a seepage layer is provided in the ditch body and above the prefabricated reinforced concrete cover plate, and seepage holes are set on the ditch body and the prefabricated reinforced concrete cover plate .

The cross section of the central seepage ditch is a trapezoid with a large top and a small bottom.

The aquitard consists of backfill graded crushed stone.

The utility model has the following advantages:

The utility model provides a tunnel structure for expansive strata, which consists of steel frame shotcrete initial support, reinforced concrete arch wall lining, inverted arch, inverted arch filling and steel grid truss in inverted arch filling, inverted arch The central seepage ditch under the structure and the waterproof layer between the primary support of the arch wall and the secondary lining of the arch wall are composed together, which mainly increases the curvature of the inverted arch, cancels the central ditch in the invert arch filling and adds steel grid trusses to improve The load-bearing performance of the base structure is improved; the tunnel drainage system is optimized, the side ditch is enlarged, and a central seepage ditch is added longitudinally through the bottom of the inverted arch to form two mutually independent drainage systems to ensure that the groundwater behind the lining of the tunnel arch wall and the bottom of the inverted arch The groundwater can be discharged smoothly, which can effectively reduce the expansion and deformation of the formation and the damage to the tunnel lining structure.

Description of drawings

Fig. 1 is a cross-sectional view of the utility model tunnel structure;

Fig. 2 is a cross-sectional view of the central seepage ditch structure of the present invention.

In the figure, 1—steel shotcrete primary support, 2—reinforced concrete arch wall lining, 3—inverted arch, 4—inverted arch filling, 5—reinforced grid truss, 6—central seepage ditch, 7—waterproof layer, 8 —Side ditch, 9—spill hole, 10—indicates the direction of groundwater seepage under the inverted arch structure.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments.

The utility model relates to a tunnel structure for expansive strata, which comprises a steel frame shotcrete primary support 1, a reinforced concrete arch wall lining 2, an inverted arch 3 and an inverted arch filling 4. A waterproof layer 7 is arranged between the shotcrete primary support 1 of the steel frame and the lining 2 of the reinforced concrete arch wall.

The utility model cancels the center ditch provided in the inverted arch filling 4, and a central seepage ditch 6 is arranged below the inverted arch 3. The central seepage ditch 6 is arranged along the longitudinal length of the tunnel, and the top surface of the ditch body is provided with a prefabricated reinforced concrete cover plate, and a water seepage layer is provided in the ditch body and above the prefabricated reinforced concrete cover plate, and a water seepage layer is provided on the ditch body and the prefabricated reinforced concrete cover plate. hole. The body cross section of the central seepage ditch 6 is a trapezoid with a large top and a small bottom. The water seepage layer is composed of backfill graded gravel, and the groundwater below the inverted arch structure passes through the water seepage layer set in the central seepage ditch 6 and finally collects to the central seepage ditch 6 to be discharged out of the cave.

The inverted arch filling 4 above the inverted arch 3 is provided with a steel grid truss 5, which improves the integrity and mechanical performance of the tunnel base structure.

The utility model increases the curvature of the inverted arch, and the inverted arch 3 has a sagittal span ratio of 1/6 to 1/10, which makes the bottom structure more smooth, and greatly improves the force bearing performance and deformation resistance.

The tunnel structure optimizes the tunnel drainage system by enlarging the side ditches 8, which are arranged longitudinally on both sides of the tunnel; the side ditches 8 are provided with drain holes 9 at intervals in the longitudinal direction, through which groundwater and ballast area water behind the lining of the tunnel arch wall pass. The drain holes are collected outside the side ditch discharge hole.

The utility model adjusts the structure of the tunnel, increases the curvature of the inverted arch of the tunnel, cancels the central ditch in the filling of the inverted arch and adds a steel grid truss, which improves the load-bearing performance of the base structure; sets the side ditch and the central seepage ditch, which can discharge the surrounding area of the tunnel The groundwater below the stratum and basement can effectively reduce the expansion and deformation of the stratum and its damage to the tunnel lining structure.

The content of the utility model is not limited to the examples listed, and any equivalent transformations taken by those skilled in the art to the technical solution of the utility model by reading the specification of the utility model are covered by the claims of the utility model.

Claims (7)

1. a kind of tunnel structure for expansive stratum, it is characterised in that：

The tunnel structure includes steelframe gunite concrete preliminary bracing（1）, reinforced concrete arch wall lining build（2）, inverted arch（3）With Inverted arch is filled（4）；

The inverted arch（3）The inverted arch filling of top（4）Inside it is provided with reinforcing bar grid truss（5）；

The inverted arch（3）Lower section is provided with center sewer（6）.

2. a kind of tunnel structure for expansive stratum according to claim 1, it is characterised in that：

Steelframe gunite concrete preliminary bracing（1）It is built with reinforced concrete arch wall lining（2）Between be provided with waterproof layer（7）.

3. a kind of tunnel structure for expansive stratum according to claim 1, it is characterised in that：

Inverted arch（3）Inverted arch ratio of rise to span be 1/6~1/10.

4. a kind of tunnel structure for expansive stratum according to claim 1, it is characterised in that：

Both sides set longitudinally through lateral sulcus in tunnel（8）；Lateral sulcus（8）It is longitudinally spaced to be provided with drain hole（9）；

Tunnel arch wall lining cutting behind underground water and railway roadbed area water pass through drain hole（9）It is collected to lateral sulcus（8）It discharges outside hole.

5. a kind of tunnel structure for expansive stratum according to claim 1, it is characterised in that：

Center sewer（6）Along tunnel longitudinally elongated setting, ditch body top surface is provided with prefabricated reinforced concrete cover board, in ditch body and Permeable layer is provided with above prefabricated reinforced concrete cover board, water seepage hole is both provided on ditch body and prefabricated reinforced concrete cover board.

6. a kind of tunnel structure for expansive stratum according to claim 5, it is characterised in that：

Center sewer（6）Ditch body cross section in up big and down small trapezoidal.

7. a kind of tunnel structure for expansive stratum according to claim 5, it is characterised in that：

Permeable layer is made of backfill graded broken stone.