JP2818841B2 - Water stopping structure in the ground and water stopping method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underground facility in the ground having a structure connected to the ground surface by a tunnel, particularly, industrial waste and radioactive waste having chemical toxicity. The present invention relates to a water stopping structure in the ground and a water stopping method for safely burying and disposing of a substance which may harm humans in the deep ground below.

[Prior Art] Conventionally, for example, as a measure for safely burying radioactive waste, as shown in FIG. 7, in a basement on a mountainside, a relatively shallow basement or a relatively deep basement,
A method of excavating the cavity A in the ground and surrounding it with an artificial barrier that can suppress the flow of groundwater and the leakage of nuclides to a small amount has been considered.

By the way, in the stratum, there are permeable zones of various sizes, such as standing gravel layers and crack zones. Permeability zones with large water permeability and large groundwater flow, such as large-scale fault crush zones, become water paths for nuclides leaking from waste and serve as short-circuit paths to the ground. This is dealt with by laying out the layout. Small single fissures such as joints and bedding are so small that they can be neglected as a permeability channel and are distributed in the stratum, so if they are captured on the scale of the disposal facility, they should be regarded as porous media. No special considerations are required when arranging facilities and designing artificial structures.

[Problems to be Solved by the Invention] However, there is a risk that nuclides may leak to the surface of the ground along or along a deteriorated zone around the access tunnel B necessary for construction and waste transportation. Yes. The degraded zone of the tunnel is considered to be rock damage due to blasting due to tunnel excavation, rock destruction under secondary ground stress, and opening of existing cracks due to decrease in radial stress of rock around the tunnel.

In order to prevent such a deterioration zone around the tunnel from being a problem in safety evaluation, it is necessary that the closing of the tunnel and the water stop around the tunnel can be performed with predetermined performance. Among these, there are measures to close down the tunnel, using materials that can be expected to have long-term soundness and have high quality, such as clay-based fillers. the prospect is not attached.

For example, as shown in FIG. 8, even if an attempt is made to excavate the widened portion C at a certain position in the tunnel B and fill the widened portion C with a poorly permeable material, the deterioration zone around the tunnel is widened by the widened excavation. There is a problem that D further increases. At present, it is difficult to confirm the reliability of construction quality and long-term soundness of grouting method.

The present invention solves the above-mentioned problem, and it is possible to prevent leakage of harmful substances by reliably stopping water in a groundwater flow path moving through a deterioration zone caused by tunnel excavation, thereby preventing leakage of harmful substances. It is an object of the present invention to provide a waterproof structure and a waterproof method.

The structure for stopping water and the method of stopping water can be applied to underground cavernous facilities connected to the surface of the ground by means of uprights, slopes, and crossings.

Means for Solving the Problems For this purpose, the in-ground water stopping structure of the present invention is joined in a flange shape around a tunnel excavated in the ground, and is a flat plate or axisymmetrical to the axis of the tunnel. A water stopping structure constructed in the shape of a curved plate, wherein the water stopping structure comprises a glassy substance formed by melting the ground in situ as a part or all of a material. Features.

Further, in the in-ground water stoppage method according to the present invention, the boring is radially constructed around a tunnel, a heating element is inserted into the boring hole, and after filling the glass base material into the boring hole, the heating is performed. By heating the inside of the boring hole by a body and melting the ground around the glass base material and the boring hole, a water blocking zone made of glassy material and molten rock is formed in a deteriorated zone around the gallery. I do.

Further, in the method for stopping water in the ground of the present invention, drilling is performed around a tunnel, and a rod-shaped heating element is inserted into the boring hole or the rod-shaped heating element is inserted into the ground while melting the ground by the heating element. By embedding and gradually rotating or translating the heating body while keeping it orthogonal or oblique to the axis of the tunnel, forming a water stop zone composed of glassy material and molten rock after rotating while melting the ground It is characterized by making it.

[Operation] In the present invention, as shown in FIGS. 1 and 2, for example, a boring hole 1 is formed in a degraded zone D around a mine tunnel in order to form a water stop zone composed of a glassy substance 6 and a molten rock 7. Excavation ensures that even if the deterioration zone D further increases, the groundwater flow path moving through the deterioration zone D is completely stopped by the vitreous material 6 and the molten rock 7.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 are diagrams for explaining one embodiment of a method for stopping water in the ground according to the present invention, wherein FIG. 1 is a conceptual diagram and FIG. 2 is a sectional view.

In FIG. 1, a medium-diameter bore is bored radially at a predetermined location of a tunnel B, and a rod-shaped heating element 2 is inserted into a bore hole 1. The heating element 2 is connected to the control device 3. Reference numeral 5 denotes a backfill material for closing the tunnel.

Then, after the glass substrate 4 is filled in the boring hole 1, the inside of the boring hole 1 is heated by the heating element 2, and as shown in FIG. In addition, the ground around the borehole 1 is melted to form a molten rock 7. When this is carried out for all the boring holes 1, the glassy substance 6 which is joined in a flange shape around the tunnel B excavated in the ground and is constructed in a flat plate shape perpendicular to the axis of the tunnel, A water stopping structure composed of the molten rock 7 is formed. The heating temperature is generally 1200 to 2000 ° C at which the rock melts, but can be 800 to 1000 ° C if a special flux is used.

Next, another embodiment of the present invention will be described with reference to FIG.

First, as shown in FIG. 3 (A), boring is performed around a tunnel B, a rod-shaped heating element 2 is inserted as a heating element into the boring hole 1, and the ground is heated while the ground is melted by the heating element. Embed body 2 in the ground. Next, as shown in FIG. 3 (B), the heat insulating guide device 9 and the heating element rotating device 10 are arranged on the inner peripheral surface of the tunnel B, and
Is set in the heating body rotating device 10 through the heat insulating guide device 9, and by rotating the heating body rotating device 10, the heating body 2 is gradually rotated while being orthogonal or oblique to the axis of the tunnel B. Alternatively, by performing parallel movement, as shown in FIG. 3 (C), molten rock 7 is formed by cooling and solidifying after rotational movement while melting the ground. As in the embodiment of FIGS. 1 and 2, when the ground is melted, a glassy material and molten rock may be formed by supplying a glass base material from a tunnel.

Also, as shown in FIG.
a and 2b may be used for heating by Joule heat by passing a current between the electrode rods 2a and 2b.

As shown in FIG. 5, the water stopping structure constituted by each of the above embodiments is joined in a flange shape around a tunnel B excavated in the ground, and is constructed in a flat plate shape orthogonal to the axis of the tunnel. Is a water-stop structure C composed of a vitreous substance 6 and a molten rock 7 to be formed.

Further, as shown in FIG. 6, the water stopping structure C may be constructed in the shape of an axisymmetric curved plate.

[Effects of the Invention] As described above, according to the present invention, it is constructed in the shape of a flat plate or an axisymmetric curved plate that is joined in a flange shape around a tunnel excavated in the ground and is orthogonal to the axis of the tunnel. Conventional water-blocking structure is characterized in that the water-stopping structure is characterized in that a glassy substance formed by melting an in-situ ground is used as a part or all of a material. Such drilling of the borehole ensures that even if the deterioration zone further increases, the groundwater flow path moving through the deterioration zone is stopped by the vitreous matter and the molten rock.

In addition, the vitreous material and the molten rock can maintain their soundness for a long period of time, for example, 1000 years, can have a low level of water permeability, and can reliably prevent leakage of radioactive waste.

[Brief description of the drawings]

1 and 2 are diagrams for explaining one embodiment of a water stopping method according to the present invention, wherein FIG. 1 is a conceptual diagram, FIG. 2 is a sectional view, and FIGS. 3 (A) and (B). ) And (C) are diagrams showing another embodiment of the water stopping method of the present invention, FIG. 4 is a diagram showing still another embodiment of the water stopping method of the present invention, and FIG. FIG. 6 is a perspective view showing one embodiment of the structure, FIG. 6 shows another embodiment of the waterproof structure of the present invention, FIG. 6A is a perspective view, and FIG.
FIG. 7 is a cross-sectional view, FIG. 7 is a conceptual view showing a method of disposing of radioactive waste, and FIG. 8 is a cross-sectional view for explaining a conventional method of stopping water in the ground. B: tunnel, C: water-stop structure, D: degradation zone, 1
... boring holes, 2 ... heating body (rod-shaped heating body), 4 ...
... Glass substrate, 6 ... Glass material, 7 ... Molten rock.

Claims (5)

(57) [Claims] 1. A water-stopping structure which is formed in the form of a flat plate or an axisymmetric curved plate which is joined in a flange shape around a tunnel excavated in the ground and which is orthogonal to the axis of the tunnel. The structure for water stoppage in the ground, wherein the structure for water comprises a part or the whole of a glassy substance formed by melting the ground in situ. 2. Boring is radiated around a tunnel, a heating element is inserted into the borehole, a glass substrate is filled in the borehole, and the inside of the borehole is heated by the heating element. Melting the ground around the glass base material and the boring hole to form a water stop zone made of a glassy substance and molten rock in a degraded zone around the tunnel. 3. Boring is carried out around a tunnel, and a rod-shaped heating element is inserted into the boring hole, or the rod-shaped heating element is embedded in the ground while the ground is melted by the heating element, and the heating element is inserted into the tunnel. By gradually rotating or translating the shaft while keeping it perpendicular or oblique to the axis, forming a water stop zone composed of glassy material and molten rock after the rotational movement while melting the ground. Water stop method. 4. The method for stopping water in the ground according to claim 2, wherein the heating body is composed of two electrode rods and is heated by Joule heat. 5. The method for stopping water in a ground according to claim 2, wherein a glass base material is supplied from a tunnel when the ground is melted.