JP5839276B2 - Backfill material filling method - Google Patents

Description

  The present invention relates to a method for filling a backfill material filled between a natural ground and a segment.

  FIG. 1 is a schematic diagram showing a nuclear fuel cycle. As shown in FIG. 1, high-level radioactive waste that has been treated at the reprocessing plant F1 and is no longer usable is stored for a certain period in the high-level radioactive waste storage facility F2, and then disposed of in geological formation. Thus, the facility for geological disposal of high-level radioactive waste is the geological disposal facility F3. The geological disposal facility F3 is planned for the purpose of isolating high-level radioactive waste from the human living sphere and natural environment for an extremely long period of about 10,000 years or more. Geological disposal facilities target two types of rocks, hard rocks and soft rocks, and facility plans and related technical studies and plans are being conducted by the government and related organizations.

  FIG. 2 is a conceptual diagram showing a geological disposal facility. As shown in FIG. 2, the geological disposal facility F3 includes a ground facility S1 and an underground facility S2. The underground facility S2 includes a tunnel group T, and a vertical shaft T1 or an inclined shaft (not shown) for accessing the tunnel group T from the ground facility S1. The tunnel group T is provided in a width of several km square, and the tunnel extension is assumed to extend over several hundred km. In Japan, the statute stipulates that the tunnel group T should be an underground facility with a depth of 300 m or more. However, since high-level radioactive waste is disposed of in geological formations, it will aim at a deeper location.

  By the way, in the case of a geological disposal facility that targets soft rock, the strength of the natural ground is lower than that of a geological disposal facility that targets hard rock, and the initial ground pressure is larger than the strength of natural ground, so In order to ensure the stability of the mine shaft during operation (maintenance and management stage), heavy support is required.

  On the other hand, in a geological disposal facility for high-level radioactive waste, cement materials used for supporting works and grouts are eluted into groundwater, creating a highly alkaline environment. Such a highly alkaline environment alters bentonite-based soil materials and surrounding rocks used as cushioning materials and backfill materials, resulting in increased uncertainty in securing long-term performance. In order to solve such a problem, as shown in FIG. 3, a mine shaft using a segment 104 using rock for supporting work has been proposed. As shown in FIG. 4, the segment 104 using rock for supporting work has a rock block 142 such as granite arranged on a steel mold 141, and a rock block 142 between the rock block 142 and the rock block 142. It is a composite segment in which a mortar (not shown) is filled in a gap generated between the frame and the mold 141 (see, for example, Patent Document 1).

  On the other hand, even if a mine is constructed using a segment, when the inner wall surface of the mine shaft (the excavation wall surface of the natural ground) protrudes as the mine excavation proceeds, if the deformation is not transmitted to the segment, the segment It cannot resist the deformation of the natural ground. Thereby, when constructing a mine shaft using a segment for supporting work, it is required to fill a gap formed between the segment and the inner wall surface of the mine shaft with a backfill material.

  In the above-mentioned geological disposal facility for high-level radioactive waste, it is required to use as little cement-based material as possible, and therefore it has been proposed to use a non-cement-based backfill material made of crushed stone (for example, Non-Patent Document 1 and Non-Patent Document 2).

JP 2002-250795 A

Katsuhiko Hayashi, Satoshi Noguchi et al., "Research on reduction technology of cement materials used for tunnel support in high-level radioactive waste disposal facilities" Japan Atomic Energy Agency, Geological Disposal Research and Development Division, Geological Disposal Fundamental Research and Development Unit Hiroyuki Tada, Hiroo Kumasaka, et al., “Deformation characteristics test of backfilled crushed stone of rock use segment support construction and examination of tunnel stability”, Japan Society of Civil Engineers, 66th Annual Scientific Lecture (2011) p. 117-118

  However, even if a non-cement backfill material made of crushed stone is blown between the natural ground and the segment, the backfill material cannot be filled at a high density. As a result, even if the natural wall surface is displaced toward the inside sky, it is expected that the backfill material absorbs the displacement and the supporting reaction force of the segment is not sufficiently transmitted to the natural mountain.

  This invention is made in view of the above, Comprising: It provides the filling method of the backfilling material which can be filled with the non-cement type backfilling material which consists of a crushed stone between a natural ground and a segment with high density. Objective.

  In order to solve the above-described problems and achieve the object, the present invention provides a filling process for filling a flexible packaging container with crushed stone, a compacting process for compacting the crushed stone filled in the packaging container, and a compacted crushed stone And a packaging step of packaging in a packaging container.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, the compacting step compacts the crushed stone in a state where the packaging container filled with the crushed stone is accommodated in a rigid compression container.

  Moreover, this invention is characterized by the said filling process filling the crushed stone in the state which accommodated the said packaging container in the said compression container in the said invention.

  In addition, the present invention installs a backfill material made of crushed stone that has been compacted and packed in advance between the ground and the segment after assembling the segment to the inner side of the excavated tunnel and the upper shoulder. It is characterized by doing.

  Further, the present invention is the above invention, wherein in the above-mentioned invention, after installing a back-filling material made of crushed stone that has been compacted and packed in advance, crushed stone, sand, or powder bentonite is left in a gap remaining between the natural ground and the segment. It is characterized by filling.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, a back-filling material made of crushed stone that has been compacted in advance and packaged is installed at the top end together with the segment.

  The present invention also provides a block-shaped backfill material made of crushed stone that has been compacted and packed in advance between a ground and a segment, and crushed stone that has been packed in a fluid state. The backfill material for gaps made of is filled in the gaps remaining between the ground and the segments.

  In addition, the present invention provides a gap remaining between the natural ground and the segment after the block-shaped backfill material made of crushed stone that has been compacted and packed in advance is placed between the natural ground and the segment. It is characterized by blowing crushed stone.

  The filling method of the backfilling material according to the present invention includes a filling step of filling a crushed stone in a flexible packaging container, a compacting step of compacting the crushed stone filled in the packaging container, and a packaging for packaging the compacted crushed stone in the packaging container. The crushed stone is compacted and packaged. As a result, the non-cement backfill material made of crushed stone has a high density and is filled at a high density between the natural ground and the segment.

  The method of filling the backfilling material according to the present invention is based on the crushed stone that has been compacted and packed in advance between the ground and the segment after assembling the segment to the inner side of the excavated tunnel and the upper shoulder. Therefore, the non-cement backfill material made of crushed stone is filled with high density between the natural ground and the segment.

  The filling method of the backfilling material according to the present invention is a state in which a block-like backfilling material made of crushed stone that has been compacted and packed in advance is placed between the ground and the segment and has fluidity. The backfill material for gaps made of crushed stone packed in the space is filled in the remaining gap between the ground and the segment, so the non-cement backfill material made of crushed stone is placed between the ground and the segment. Filled with high density.

  The backfilling material filling method according to the present invention includes a block-shaped backfilling material, which has been compacted and packed in advance, between the ground and the segment, and then placed between the ground and the segment. Since the crushed stone is blown into the remaining gap, the non-cement backfill material made of crushed stone is filled with high density between the natural ground and the segment.

FIG. 1 is a schematic diagram showing a nuclear fuel cycle. FIG. 2 is a conceptual diagram showing a geological disposal facility. FIG. 3 is a half cross-sectional bird's-eye view showing a tunnel constructed using a segment using rocks. FIG. 4 is a perspective view showing a segment using the rock shown in FIG. FIG. 5 is a conceptual diagram showing a test apparatus for testing the deformation characteristics of the backfill material. FIG. 6 is a diagram showing the deformation characteristics of the backfill material obtained by the test. FIG. 7 is a process diagram illustrating the backfilling material filling method according to the first embodiment of the present invention. FIG. 8 is a perspective view showing a packaging container filled with crushed stone. FIG. 9 is a perspective view showing a state in which crushed stone is filled in a packaging container housed in a compression container. FIG. 10 is a perspective view showing a block-like backfill material that has been compacted and packaged. FIG. 11 is a conceptual diagram showing a state in which a block-like backfilling material is installed between a natural ground and a segment. FIG. 12 is a cross-sectional view showing a state in which a block-shaped backfill material is installed between the natural ground and the segment. FIG. 13 is a perspective view showing a state in which a block-like backfilling material is installed between the natural ground and the segment. FIG. 14 is a cross-sectional view showing a state in which a block-shaped backfill material is installed between the natural ground and the segment. FIG. 15 is a perspective view showing a state in which a block-like backfill material is installed between the natural ground and the segment.

  First, based on FIG. 5 and FIG. 6, the deformation characteristics of a non-cement backfill material made of crushed stone will be described. FIG. 5 is a conceptual diagram showing a test apparatus for testing the deformation characteristics of the backfill material, and FIG. 6 is a diagram showing the deformation characteristics of the backfill material obtained by the test.

  As shown in FIG. 5, a test apparatus for testing the deformation characteristics of a non-cement-based backfilling material fills a steel frame F installed on a pedestal D with crushed stone S, and a loading plate P installed thereon. The compression force is applied to the crushed stone S. In the example shown in FIG. 5, a cylindrical steel frame F having a diameter of 303.3 mm is placed on a square pedestal D having an upper surface of 450.0 mm on a side, and crushed stone S is filled therein. The thickness of the crushed stone S to be filled was 10 cm and 20 cm, and each was tested. In this test, after loading on the loading plate P, it was once unloaded and loaded again on the loading plate P.

  As shown in FIG. 6, it can be seen that in the first loading and the second loading, the displacement is large in the first loading and the displacement is very small in the second loading. Further, the amount of displacement in the first loading depends on the thickness of the crushed stone S. When the thickness of the crushed stone S is 10 cm, it becomes about half (1/2) of the 20 cm, and the smaller the thickness of the crushed stone S, the more the displacement. It can be seen that the amount (deformation amount) is small.

  In view of the above, an embodiment of the backfilling material filling method of the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to the embodiments.

[Embodiment 1]
FIG. 7 is a process diagram illustrating the backfilling material filling method according to the first embodiment of the present invention. FIG. 8 is a perspective view showing a packaging container filled with crushed stone, and FIG. 9 is a perspective view showing a state where the packaging container accommodated in the compression container is filled with crushed stone. FIG. 10 is a perspective view showing a block-like backfill material that has been compacted and packaged.

  As shown in FIG. 7, the filling method of the backfill material according to the first embodiment of the present invention includes a filling process (step S1), a compacting process (step S2), and a packaging process (step S3). After the crushed stone S is compacted and the block-shaped backfilling material 1 is formed, the segment 4 is assembled to the inner side of the mine shaft 2 where the block-shaped backfilling material 1 is excavated and to the upper shoulder. It is installed between the natural ground 3 (step S4).

  The filling step (step S1) is a step of filling the packaging container 10 with the crushed stone S in a state where the flexible packaging container 10 is accommodated in the rigid compression container C as shown in FIG. The packaging container 10 is made of a material that can be deformed, such as paper, cloth, and non-woven fabric, and has a strength that does not break even when a stress of about 2 MPa is applied. As shown in FIG. 8, the packaging container 10 is formed in a box shape having an upper surface opened, and the opened upper surface is closed by a lid portion 10a. As shown in FIG. 9, the compression container C is formed in a box shape having a volume substantially the same as the volume of the packaging container 10 so as to accommodate the packaging container 10 without a gap. The upper surface of the compression container C is open, and the packaging container 10 is accommodated in the compression container C from above the compression container C. The compression container C is made rigid so as not to be deformed, and has a strength that does not break even if the packaging container 10 is filled with the crushed stone S and the crushed stone S is compacted. Yes.

  The compacting step (step S2) is a step of compacting the crushed stone S filled in the packaging container 10 accommodated in the compression container C, whereby the packaging container 10 filled with the crushed stone S is accommodated in the compression container C. This will compact the crushed stone S. In the compacting step (step S2), the loaded crushed stone S is loaded so that a predetermined compressive stress acts on the filled crushed stone S. The predetermined compressive stress is, for example, 2 MPa, which corresponds to an expected support reaction force.

  The packaging step (step S3) is a step of packaging the compacted crushed stone S in the packaging container 10 as shown in FIG. In the packaging process (step S3), the opened upper surface is closed with the lid 10a and sealed with an adhesive (not shown) or the like. Thereby, the crushed stone S filled in the packaging container 10 is compacted and becomes the packaged block-shaped backfilling material 1. This block-shaped backfilling material 1 is taken out from the compression container C and installed between the segment 4 and the ground pile 3, but the opened upper surface is closed by a lid 10a and sealed with an adhesive or the like. Therefore, deformation is limited.

  FIG. 11 is a conceptual diagram showing a state in which a block-like backfilling material is installed between a natural ground and a segment. As described above, the block-shaped backfill material 1 made of the crushed stone S that has been compacted and packaged assembles the segment 4 up to the inner side of the excavated tunnel 2 and the upper shoulder as shown in FIG. After that, it is installed between the natural ground 3 and the segment 4. Segment 4 is a segment using rocks, and a rock block such as granite is placed on a steel formwork, and a gap formed between the rock block and the rock block is formed between the rock block and the rock block. A composite segment filled with mortar. And the crevice between the natural ground 3 and the segment 4 installed to the shoulder upper part is filled with crushed stone, sand, or powder bentonite.

  A block-like backfilling material 1 is installed together with a segment 4 at the top end of the mine shaft 2. In this case, if the block-shaped backfilling material 1 is adhered to the back surface of the segment 4 (the surface facing the natural ground 3) using an adhesive or a double-sided tape, it can be installed more smoothly. And the crevice between the natural ground 3 and the segment 4 installed in the top part is filled with crushed stone, sand, or powder bentonite.

  In the filling method of the backfilling material according to the first embodiment of the present invention described above, the filling step of filling the packaging container 10 with the crushed stone S in a state where the flexible packaging container 10 is accommodated in the rigid compression container C (step S1). And a compacting process (step S2) for compacting the crushed stone S in a state where the packaging container 10 filled with the crushed stone S is accommodated in the compression container C, and a packaging process (step S2) for packaging the compacted crushed stone S in the packaging container 10 Crushed stone S is compacted and packaged. Thereby, the non-cement backfill material (block-shaped backfill material 1) made of crushed stone S has a high density, and is filled between the natural ground 3 and the segment 4 at a high density.

  Further, since the crushed stone S is compacted and the crushed stone S does not spill out from the packaged back-filling material 1, it is not necessary to take measures such as a face plate (not shown) on the face side. .

  In addition, since the crushed stone S is compacted and the packed block-shaped backfilling material 1 is loaded with a compressive force in advance, the displacement of the natural ground 3 is directly transmitted to the segment 4. The support effect as a reaction force is increased.

[Embodiment 2]
FIG. 12 is a cross-sectional view showing a state in which a block-like backfilling material is installed between the natural ground and the segment, and FIG. 13 shows a block-like backfilling material installed between the natural ground and the segment. It is a perspective view which shows the state which carried out.

  As shown in FIG. 12 and FIG. 13, the backfilling material filling method according to the second embodiment of the present invention is a block-like backfilling material 5 made of crushed stone S that has been compacted and packed in advance ( (Hereinafter referred to as “block-shaped backfill material 5”) is placed between the natural ground 3 and the segment 4 using rock (hereinafter simply referred to as “segment 4”) and packed in a fluid state. The gap backfilling material 6 (hereinafter referred to as “gap backfilling material 6”) made of the crushed stone S is filled in the gap remaining between the natural ground 3 and the segment 4.

  The block-shaped backfilling material 5 is obtained by compacting a predetermined amount of crushed stone S into a block shape with a predetermined compression force and packing it in a bag. In addition, the block-like backfill material 5 is compacted after crushing the crushed stone S after the bagging of the backfill material, which is the first embodiment of the present invention described above, and then the mouth of the bag is closed. May be good.

  The backfilling material 6 for the gap can be deformed to some extent even in a packed state. The gap backing material 6 is smaller and thinner than the block-like backing material 5.

  In the backfilling material filling method according to the second embodiment of the present invention, first, a block-like backfilling material 5 is installed between the natural ground 3 and the segment 4. If a gap remains between the natural wall surface and the block-shaped backfilling material 6, or between the block-shaped backfilling material 6 and the segment 4, the block-shaped backfilling material 6 becomes the segment 4. The back-filling material (gap back-filling material 6) is filled by pushing the back-filling material 6 for the gap between the natural wall surface and the block-shaped back-filling material 5 so as to contact the back surface of the ground.

  In the backfilling material filling method according to the second embodiment of the present invention described above, the block-like backfilling material 5 is installed between the ground 3 and the segment 4 and the backfilling material 6 for the gap is grounded. Since the gap remaining between the mountain 3 and the segment 4 is filled, the non-cement backfill material made of the crushed stone S is filled between the ground mountain 3 and the segment 4 at a high density.

  Further, since the backfill material 6 for a gap is pushed between the ground wall surface and the block-shaped backfill material 5 so that the block-shaped backfill material 5 contacts the back surface of the segment 4, Even when there is land, the backfill material 6 for the gap is deformed and filled. Thereby, the unfilling of the backfill material does not occur. Therefore, it is not necessary to take measures to directly fill crushed stone or sand between the natural ground 3 and the block-shaped backfilling material 5 and between the block-shaped backfilling material 5 and the segment 4.

  In addition, between the natural ground 3 and the segment 4, a block-like backfill material 5 and a backfill material 6 for a gap are filled, and crushed stone and sand are not directly filled. There is no need to take measures such as a gable board on the face side.

  Further, since the block-shaped backfill material 5 is made of the crushed stone S that has been compacted and packed in advance, the amount of deformation is reduced, and the displacement of the natural ground 3 is directly transmitted to the segment 4. The supporting effect as a reaction force is increased.

  In the backfilling material filling method according to the second embodiment of the present invention described above, the ground wall surface and the blocky backfilling material 5 are arranged so that the block-like backfilling material 5 contacts the back surface of the segment 4. The gap back-filling material 6 is pushed and filled in between, but the gap back-filling material 6 may be pushed and filled between the segment 4 and the block-shaped back filling material 5.

[Embodiment 3]
FIG. 14 is a cross-sectional view showing a state in which a block-shaped backfilling material is installed between a natural ground and a segment, and FIG. It is a perspective view which shows the state which carried out.

  As shown in FIGS. 14 and 15, the filling method of the backfilling material according to the embodiment of the present invention is a block-like backfilling material 7 (hereinafter referred to as “the backfilling material 7”) made of crushed stone that has been compacted and packed in advance. After installing the “block-shaped backfill material 7” between the natural ground 3 and the segment 4 using the rock (hereinafter simply referred to as “segment 4”), between the natural ground 3 and the segment 4 The crushed stone S is blown into the remaining gap.

  The block-shaped backfill material 7 is obtained by compacting a predetermined amount of crushed stone S into a block shape with a predetermined compressive force, and packing it in a bag. In addition, the block-like backfill material 7 is compacted after crushing the crushed stone S after bagging in the same manner as the backfill material filling method according to the first embodiment of the present invention described above, and then the mouth of the bag is closed. May be good.

  In the backfilling material filling method according to the third embodiment of the present invention, first, a block-like backfilling material 7 is installed between the natural ground 3 and the segment 4. Next, crushed stone S (backfilling material) is blown and filled into the gaps remaining between the natural wall surface and the block-like backfilling material 7 and between the block-like backfilling material 7 and the segment 4. Then, by alternately repeating the installation of the block-shaped backfill material 7 and the blowing and filling of the crushed stone S, the backfill material (the block-shaped backfill material 7 and the crushed stone S ( Fill with backfill material)).

  In the filling method of the backfilling material according to the third embodiment of the present invention described above, the installation of the block-like backfilling material 7 and the blowing filling of the crushed stone S are alternately repeated, so that the natural ground 3 and the segment 4 Since the back-filling material (block-shaped back-filling material 7 and crushed stone S (back-filling material)) is filled in between, the back-filling material (crushed stone S) is filled at a higher density than when the back-filling material (crushed stone S) is blown and filled.

  In addition, after the block-shaped backfilling material 7 is installed, a gap remaining between the natural ground 3 and the segment 4 (between the natural ground wall surface and the block-shaped backfilling material 7, the block-shaped backfilling material 7 and Since the crushed stone S (backing material) is filled between the segment 4), the crushed stone S is not easily spilled and there is no need to take measures such as a face plate on the face side.

  Further, since the block-shaped backfill material 7 is made of the crushed stone S that has been compacted and packed in advance, the amount of deformation is reduced, and the displacement of the natural ground 3 is directly transmitted to the segment 4. The supporting effect as a reaction force is increased.

DESCRIPTION OF SYMBOLS 1 Block-shaped backfilling material 10 Packaging container 10a Cover part 2 Tunnel 3 Ground mountain 4 Segment 5 Block-shaped backfilling material 6 Backfilling material for gaps 7 Block-shaped backfilling material C Compression container D Base F Steel frame P Loading plate S Crushed stone

Claims (7)

Filling process for filling crushed stone in flexible packaging container;
A compacting step of compacting the crushed stone filled in the packaging container;
The crushed stone compacted possess a packaging process for packaging in the packaging container,
The compaction step, back-filling material filling method in which crushed stone is characterized Rukoto compacted crushed stone in a state accommodated in a rigid compression container packaging container filled. 2. The backfilling material filling method according to claim 1 , wherein the filling step fills the crushed stone in a state where the packaging container is accommodated in the compression container.   After assembling the segment to the inner side of the excavated tunnel and the upper shoulder, a backfilling material made of crushed stone that has been compacted and packed in advance is installed between the ground and the segment. Backfill material filling method. The ground space between the ground and the segment is filled with crushed stone, sand, or powdered bentonite after installing a backfill material made of crushed stone that has been compacted and packed in advance. backfill material filling method described in 3. 5. The backfilling material filling method according to claim 3 or 4 , wherein a backfilling material made of crushed stone that has been compacted in advance and packaged is installed at the top end together with the segment.   A block-shaped backfill material made of crushed stone that has been compacted and packed in advance is placed between the ground and the segment, and the back for the gap made of crushed stone that is packed in a fluid state A backfilling material filling method comprising filling a gap remaining between a natural ground and a segment.   A block-like backfill material made of crushed stone that has been compacted and packed in advance is installed between the ground and the segment, and then the crushed stone is blown into the gap remaining between the ground and the segment. Filling method of backfill material.

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