A method for controlling uneven settlement of leveled sites in collapsible loess areas
By excavating pre-buried trenches for drainage walls and constructing pre-buried piles in collapsible loess areas, combined with heavy hammer compaction and sodium silicate solution, the problem of uneven settlement of collapsible loess was solved, and the compactness and stability of the loess were improved.
Patent Information
- Application Number
- CN202311446946.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-02
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2043-11-02
AI Technical Summary
Collapsible loess areas are prone to uneven settlement if left untreated for a long time, leading to soil loss and building collapse, which is difficult to effectively control with existing technologies.
Drain wall embedded trenches are excavated around the collapsible loess area, embedded piles and drain grilles are constructed, and the site is divided into triangular areas. By combining composite foundation with heavy hammer compaction method, sodium silicate solution is used to promote the coagulation of loess, and ash soil is injected through extrusion holes to form ash soil piles to increase the compactness of the loess.
Effectively prevent loess loss, improve site stability, control uneven settlement, and enhance the overall stability of collapsible loess areas.
Smart Images
Figure CN117364738B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of uneven settlement treatment of collapsible loess, in particular to a method for controlling uneven settlement of a leveled site in a collapsible loess area. Background Art
[0002] Collapsible loess is a type of unsaturated, undercompacted soil. At natural temperatures, it has low compressibility and high strength. However, when soaked in water, its strength decreases significantly. Under additional pressure, or a combination of additional pressure and deadweight pressure, it undergoes rapid structural deformation and failure, posing a significant threat to construction projects. Collapsible loess is a special type of soil that undergoes significant additional deformation due to structural damage after immersion in water. Some miscellaneous fill soils also exhibit collapsibility, and many loess soils found in Northeast, Northwest, Central, and parts of East my country are prone to this behavior.
[0003] The existing collapsible loess is prone to uneven settlement if no human intervention is performed for a long time, which can easily cause nearby soil loss and building collapse. Therefore, the problem of uneven settlement in collapsible loess sites needs to be solved urgently. Summary of the Invention
[0004] The purpose of the present invention is to provide a method for controlling uneven settlement of leveled sites in collapsible loess areas. The method is easy to operate and can not only prevent the loess from being lost along with the water, but also facilitate the smooth transportation of water. It can increase the lateral extrusion of the loess in the site and improve the compactness between the loess, thereby controlling the uneven settlement of the collapsible loess site and increasing the overall stability of the collapsible loess in the site, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A method for controlling uneven settlement of a leveled site in a collapsible loess region comprises the following steps:
[0007] S1: Excavate a pre-buried trench for drain walls around a large, flat outdoor area. Use the pre-buried trench for drain walls to form a rectangular area. Then, excavate two intersecting pre-buried trenches for drain walls at the diagonals of the rectangular area.
[0008] S2: A concrete foundation is poured at the bottom of the pre-buried trench of the drainage wall. Pre-buried piles are built at the same distance on the concrete foundation. The drainage grille is then fixed between the pre-buried piles. This forms a drainage system around the rectangular site and prevents soil loss in the rectangular site.
[0009] S3: Use the pre-buried trench of the drainage wall to divide the rectangular site into four triangular sites. Use excavation to excavate each triangular site in turn, dig out the collapsible loess, and then lay the gray soil layer on the bottom layer. Then lay the third collapsible loess layer on top of the gray soil layer. Then spray sodium silicate solution on the third collapsible loess layer to allow the loess to condense with each other. Then, lay a layer of building brick slag on the surface of the third collapsible loess layer, and compact the building brick slag layer with a heavy hammer tamping machine;
[0010] S4: a second collapsible loess layer is laid on top of the compacted building brick slag layer, a sodium silicate solution is sprayed on the second collapsible loess layer, and then a sand and gravel layer is laid on the second collapsible loess layer. The sand and gravel layer is compacted using a heavy hammer rammer, and the remaining first collapsible loess layer is filled onto the surface of the sand and gravel layer. The first collapsible loess layer is further compacted using the heavy hammer rammer;
[0011] S5: After the collapsible loess in each triangular area is transformed into a collapsible loess composite ground, a drilling device is used to install extrusion holes evenly at the same distance in each area so that each collapsible loess layer can be extruded horizontally. The extrusion holes are then filled with ash soil to make ash soil piles. A layer of plain soil is then laid on the surface of the collapsible loess composite ground.
[0012] Furthermore, the concrete foundation is made of steel bars and concrete, and the height of the concrete foundation is 15-20 cm and the width is 25-30 cm.
[0013] Furthermore, the embedded pile and the concrete foundation are formed by reinforced concrete, and one side of the embedded pile is made into a U-shaped groove using a mold and concrete.
[0014] Furthermore, a slot is provided on the top of the hydrophobic grille, a plug plate matching the slot is provided on the bottom of the hydrophobic grille, both ends of the hydrophobic grille are connected with U-shaped rods, and a plurality of hydrophobic holes are provided on the hydrophobic grille.
[0015] Furthermore, the width of the pre-buried trench of the hydrophobic wall is 35-40 cm, the depth of the pre-buried trench of the hydrophobic wall is 2-3 m, and the gaps between the pre-buried trench of the hydrophobic wall and the first hydrophobic reinforcement wall and the second hydrophobic reinforcement wall are filled with collapsible loess.
[0016] Furthermore, the diameter of the extrusion hole is 15-20 centimeters, and the depth of the extrusion hole is 2-2.5 meters.
[0017] Furthermore, the thickness of the plain soil is 2-5 cm, the thickness of the gray soil layer is 10-15 cm, the thickness of the third collapsible loess layer is 50-60 cm, the thickness of the building brick slag layer is 15-20 cm, the thickness of the second collapsible loess layer is 60-70 cm, the thickness of the sand and gravel layer is 25-30 cm, and the thickness of the first collapsible loess layer is the distance between the top of the hydrophobic reinforcement wall and the top of the sand and gravel layer.
[0018] Furthermore, the hydrophobic grille is installed in an upper and lower stacking manner, and the width of the hydrophobic grille is the distance between two embedded piles.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] The present invention digs pre-buried grooves for hydrophobic reinforcement walls around a large outdoor flat site in a collapsible loess area, constructs pre-buried piles and hydrophobic grilles in the pre-buried grooves, and the hydrophobic grilles are assembled to facilitate replacement in the later stage, which not only prevents the loess from being lost along with the water, but also facilitates the smooth transportation of water. Hydrophobic reinforcement walls are also constructed on the diagonals of the rectangular site, which increases the overall stability of the collapsible loess in the site; the rectangular site is divided into four triangular sites by the hydrophobic reinforcement walls, and the collapsible loess in the triangular sites is squeezed against each other by combining a composite foundation with a heavy hammer compaction method, thereby forming a tight integrated whole to achieve longitudinal squeezing. Sodium silicate solution is sprinkled on the loess during each layer of laying, which is conducive to mutual condensation between the loess; holes are then drilled in the integrated site, and ash soil is injected to form a number of ash soil piles. The drilling can increase the lateral squeezing of the loess in the site and improve the tightness between the loess, thereby controlling the uneven settlement of the collapsible loess site. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 is a transverse cross-sectional view of the present invention;
[0022] Figure 2 A longitudinal sectional view of the present invention;
[0023] Figure 3 This is a schematic diagram of the hydrophobic grid connection structure of the present invention;
[0024] Figure 4 This is a front view of the hydrophobic grille of the present invention;
[0025] Figure 5 This is a cross-sectional view of the collapsible loess composite ground of the present invention;
[0026] Figure 6 It is a schematic diagram of the lime-soil pile structure of the present invention.
[0027] In the figure: embedded groove of drain wall 1, first drain reinforcement wall 2, second drain reinforcement wall 3, embedded pile 4, concrete foundation 5, drain grille 6, U-shaped groove 7, U-shaped rod 8, slot 9, plug plate 10, drain hole 11, collapsible loess composite ground 12, first collapsible loess layer 1201, sand and gravel layer 1202, second collapsible loess layer 1203, building rubble layer 1204, third collapsible loess layer 1205, gray soil layer 1206, extrusion hole 13, gray soil pile 14, plain soil layer 15. DETAILED DESCRIPTION
[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0029] See also Figure 1-6 In an embodiment of the present invention, a method for controlling uneven settlement of a leveled site in a collapsible loess region is provided, comprising the following steps:
[0030] S1: excavate a drain wall pre-buried trench 1 around a large outdoor flat site, use the drain wall pre-buried trench 1 to form a rectangular site, and then excavate two intersecting drain wall pre-buried trenches 1 at the diagonal lines of the rectangular site;
[0031] S2: A concrete foundation 5 is poured at the bottom of the pre-buried trench 1 of the drainage wall. Pre-buried piles 4 are constructed at equal distances on the concrete foundation 5. Then, drainage grilles 6 are fixed between the pre-buried piles 4. This forms a drainage system around the rectangular site and prevents soil loss in the rectangular site.
[0032] S3: Divide the rectangular site into four triangular sites by using the pre-buried groove 1 of the drain wall, and excavate each triangular site in turn to dig out the collapsible loess. Then, lay the gray soil layer 1206 on the bottom layer. Then, lay the third collapsible loess layer 1205 on top of the gray soil layer 1206. Then, spray the sodium silicate solution on the third collapsible loess layer 1205 to allow the loess to condense with each other. Then, lay the building brick slag layer 1204 on the surface of the third collapsible loess layer 1205, and compact the building brick slag layer 1204 by using a heavy hammer tamping machine.
[0033] S4: A second collapsible loess layer 1203 is laid on top of the compacted building slag layer 1204, a sodium silicate solution is sprayed on the second collapsible loess layer 1203, and then a sand and gravel layer 1202 is laid on the second collapsible loess layer 1203. The sand and gravel layer 1202 is compacted using a heavy hammer rammer. The remaining first collapsible loess layer 1201 is then filled onto the surface of the sand and gravel layer 1202, and the first collapsible loess layer 1201 is further compacted using the heavy hammer rammer.
[0034] S5: After the collapsible loess in each triangular area is transformed into the collapsible loess composite ground 12 in turn, a punching device is used to install the same distance in each area and evenly open extrusion holes 13 so that each collapsible loess layer can be extruded horizontally, and then the extrusion holes 13 are filled with ash soil to make ash soil piles 14, and then a layer of plain soil is laid on the surface of the collapsible loess composite ground 12.
[0035] The concrete foundation 5 is made of steel bars and concrete. The height of the concrete foundation 5 is 15-20 cm and the width is 25-30 cm. The embedded piles 4 and the concrete foundation 5 are formed by reinforced concrete. One side of the embedded pile 4 is made of a mold and concrete into a U-shaped groove 7. The top of the hydrophobic grille 6 is provided with a slot 9, and the bottom of the hydrophobic grille 6 is provided with a plug 10 that matches the slot 9. Both ends of the hydrophobic grille 6 are connected to a U-shaped rod 8, and the hydrophobic grille 6 is provided with a plurality of hydrophobic holes 11.
[0036] The width of the pre-buried trench 1 of the drain wall is 35-40 cm, the depth of the pre-buried trench 1 of the drain wall is 2-3 meters, and the gap between the pre-buried trench 1 of the drain wall and the first drain reinforcement wall 2 and the second drain reinforcement wall 3 is filled with collapsible loess; the diameter of the extrusion hole 13 is 15-20 cm, the depth of the extrusion hole 13 is 2-2.5 meters; the thickness of the plain soil is 2-5 cm, the thickness of the gray soil layer 1206 is 10-15 cm, and the thickness of the third collapsible loess layer 1205 is 10-15 cm. The thickness is 50-60 cm, the thickness of the building slag layer 1204 is 15-20 cm, the thickness of the second collapsible loess layer 1203 is 60-70 cm, the thickness of the gravel layer 1202 is 25-30 cm, the thickness of the first collapsible loess layer 1201 is the distance between the top of the hydrophobic reinforcement wall and the top of the gravel layer 1202; the hydrophobic grille 6 is installed in an up and down stacking manner, and the width of the hydrophobic grille 6 is the distance between the two embedded piles 4.
[0037] To sum up: the present invention has pre-buried grooves for hydrophobic reinforcement walls dug around the large outdoor flat site in the collapsible loess area, and pre-buried piles and hydrophobic grilles are constructed in the pre-buried grooves. The hydrophobic grilles are assembled, which is convenient for replacement in the later stage. It not only prevents the loess from being lost along with the water, but also facilitates the smooth transportation of water. Hydrophobic reinforcement walls are also constructed on the diagonals of the rectangular site, which increases the overall stability of the collapsible loess in the site; the rectangular site is divided into four triangular sites by using the hydrophobic reinforcement walls, and the collapsible loess in the triangular site is squeezed against each other by combining a composite foundation with a heavy hammer compaction method, thereby forming a tight whole to achieve longitudinal extrusion. Sodium silicate solution will be sprinkled on the loess during each layer of laying, which is conducive to mutual condensation between the loess; then holes are drilled in the site to form a whole, and ash soil is injected to form a number of ash soil piles. Drilling can increase the lateral extrusion of the loess in the site and improve the tightness between the loess, thereby controlling the uneven settlement of the collapsible loess site.
[0038] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A method for controlling uneven settlement of a leveled site in a collapsible loess region, characterized by: The following steps are involved: S1: excavating a drainage wall pre-buried groove (1) around a large outdoor flat area, forming a rectangular area using the drainage wall pre-buried groove (1), and then excavating two mutually intersecting drainage wall pre-buried grooves (1) at the diagonal lines of the rectangular area; S2: A concrete foundation (5) is poured at the bottom of the pre-buried groove (1) of the drainage wall, pre-buried piles (4) are constructed at the same distance on the concrete foundation (5), and then the drainage grid (6) is fixed between the pre-buried piles (4), so that a drainage system can be formed around the rectangular site and the loss of loess in the rectangular site can be prevented; S3: using the pre-buried groove of the drainage wall (1) to divide the rectangular site into four triangular sites, excavating each triangular site in turn, digging out the collapsible loess, and then laying the gray soil layer (1206) on the bottom layer, and then laying the third collapsible loess layer (1205) on top of the gray soil layer (1206), and then spraying the sodium silicate solution on the third collapsible loess layer (1205) to allow the loess to condense with each other, and then laying the building brick slag layer (1204) on the surface of the third collapsible loess layer (1205), and compacting the building brick slag layer (1204) by a heavy hammer tamping machine; S4: a second collapsible loess layer (1203) is laid on top of the compacted building brick slag layer (1204), a sodium silicate solution is sprayed on the second collapsible loess layer (1203), a sand and gravel layer (1202) is laid on the second collapsible loess layer (1203), and the sand and gravel layer (1202) is compacted using a heavy hammer tamping machine. The remaining first collapsible loess layer (1201) is then filled onto the surface of the sand and gravel layer (1202), and the first collapsible loess layer (1201) is further compacted using the heavy hammer tamping machine. S5: After the collapsible loess in each triangular area is rectified into a collapsible loess composite ground (12), extrusion holes (13) are evenly opened in each triangular area using a drilling device to allow each collapsible loess layer to be squeezed laterally, and then lime soil is filled into the extrusion holes (13) to form lime soil piles (14), and then a layer of plain soil is laid on the surface of the collapsible loess composite ground (12); The embedded pile (4) and the concrete foundation (5) are formed by reinforced concrete, and a U-shaped groove (7) is made of a mold and concrete on one side of the embedded pile (4); the top of the hydrophobic grid (6) is provided with a slot (9), the bottom of the hydrophobic grid (6) is provided with a plug plate (10) matching the slot (9), both ends of the hydrophobic grid (6) are connected with U-shaped rods (8), and the hydrophobic grid (6) is provided with a plurality of hydrophobic holes (11); the hydrophobic grid (6) is installed in an upper and lower stacking manner, and the width of the hydrophobic grid (6) is the distance between the two embedded piles (4); the width of the hydrophobic wall embedded groove (1) is 35-40 cm, the depth of the hydrophobic wall embedded groove (1) is 2-3 m, and the gap between the hydrophobic wall embedded groove (1) and the first hydrophobic reinforcement wall (2) and the second hydrophobic reinforcement wall (3) is filled with collapsible loess.
2. The method for controlling uneven settlement of a leveled site in a collapsible loess region according to claim 1, characterized in that: The concrete foundation (5) is made of steel bars and concrete. The height of the concrete foundation (5) is 15-20 cm and the width is 25-30 cm.
3. The method for controlling uneven settlement of a leveled site in a collapsible loess region according to claim 1, characterized in that: The diameter of the extrusion hole (13) is 15-20 centimeters, and the depth of the extrusion hole (13) is 2-2.5 meters.
4. The method for controlling uneven settlement of a leveled site in a collapsible loess region according to claim 1, characterized in that: The thickness of the plain soil is 2-5 cm, the thickness of the gray soil layer (1206) is 10-15 cm, the thickness of the third collapsible loess layer (1205) is 50-60 cm, the thickness of the building slag layer (1204) is 15-20 cm, the thickness of the second collapsible loess layer (1203) is 60-70 cm, the thickness of the sand and gravel layer (1202) is 25-30 cm, and the thickness of the first collapsible loess layer (1201) is the distance between the top of the hydrophobic reinforcement wall and the top of the sand and gravel layer (1202).
Citation Information
Patent Citations
Liquefaction resistance foundation stabilization method by grate hooping
CN103758113A
Deep collapsible loess comprehensive treatment structure and construction method thereof
CN112281805A