CN219450301U - Virtual filling large-thickness collapsible loess road foundation treatment structure - Google Patents

Abstract

The utility model discloses a foundation treatment structure for a collapsible loess road with a large thickness in a virtual filling manner, belongs to the field of road foundation treatment, and solves the problem that the conventional foundation treatment measures for the collapsible loess road are not suitable for the foundation of the collapsible loess road with the large thickness in the virtual filling manner. According to the utility model, a plurality of vertical filling holes are downwards formed in the surface of the virtual filled loess, water filling filler layers and clay layers are filled in the filling holes at intervals from bottom to top, a ramming layer is arranged on the surface of the virtual filled loess, a reinforcing cushion layer is paved on the ramming layer, and road embankments are paved on the reinforcing cushion layer. According to the utility model, the water filling filler layers and the clay layers are filled in the filling holes at intervals, and the ramming layer and the reinforcing cushion layer are arranged on the surface of the virtually filled loess, so that the compact consolidation of the virtually filled collapsible loess foundation is realized, the foundation collapsibility can be effectively eliminated, the void ratio of the virtually filled soil body is greatly reduced, the bearing capacity of the foundation is improved, and the post-construction settlement is greatly reduced.

Description

Virtual filling large-thickness collapsible loess road foundation treatment structure

Technical Field

The utility model belongs to the field of road foundation treatment, and particularly relates to a foundation treatment structure for a collapsible loess road with a large virtual filling thickness.

Background

The loose-fill large-thickness collapsible loess has more gaps, large thickness and insufficient compactness, and serious wet sinking when meeting water, and if the foundation is improperly selected, the loose-fill large-thickness collapsible loess is extremely easy to generate large post-construction settlement, so that the safety of the road and pipeline structure on the loose-fill large-thickness collapsible loess is influenced.

At present, the road foundation treatment measures in collapsible loess areas mainly comprise an ash soil compaction pile method, a plain soil compaction pile method, a CFG pile method, a dynamic compaction method and the like, and although the treatment measures have good treatment effects on collapsible loess road foundations, the treatment measures for treating the collapsible loess road foundations with large thickness by virtual filling have certain limitations. First, when the foundation treatment of the collapsible loess road with a large thickness is performed by virtually filling, the conventional foundation treatment measures described above are insufficient in treatment depth, and it is difficult to completely eliminate the foundation collapsibility and post-construction settlement. Second, in performing deep foundation treatments, it is often necessary to add or squeeze in large amounts of reinforcing, modifying materials, resulting in high costs for the foundation treatment. Finally, in the process of performing the foundation treatment, pile holes are formed, the foundation is compacted, and the earth materials dug by the hole forming are usually transported to a spoil field in a long distance, so that the cost of the foundation treatment is increased. How to find a treatment measure capable of eliminating the collapsibility of the large-thickness loess foundation, improving the bearing capacity of the virtually filled large-thickness collapsible loess foundation and saving the cost is a novel collapsible loess foundation treatment measure which is an engineering technical problem to be solved in the prior art of virtually filled large-thickness collapsible loess foundation treatment and is a target for the engineering technicians.

Disclosure of Invention

The utility model aims to provide a foundation treatment structure for a collapsible loess road with a large thickness in a virtual filling manner, so as to solve the problem that the conventional foundation treatment measures for the collapsible loess road are not suitable for the foundation of the collapsible loess road with the large thickness in the virtual filling manner.

The technical scheme of the utility model is as follows: a foundation treatment structure for a collapsible loess road with a large thickness is characterized in that a plurality of vertical filling holes are downwards formed in the surface of the virtual filled loess, water filling filler layers and clay layers are filled in the filling holes from bottom to top at intervals, rammed layers are arranged on the surface of the virtual filled loess, reinforcing cushion layers are paved on the rammed layers, and road embankments are paved on the reinforcing cushion layers.

As a further improvement of the present utility model, the lower end of the filling hole reaches the undisturbed foundation.

As a further development of the utility model, the width of the ramming layer and the reinforcing mat is greater than the width of the toe of the road embankment.

Under the aims of improving the foundation treatment depth, increasing the foundation bearing capacity, reducing post-construction settlement and saving cost, the utility model realizes the compaction and consolidation of the foundation of the virtual filling collapsible loess by filling the water filling filler layer and the clay layer in the filling holes at intervals and arranging the ramming layer and the reinforcing cushion layer on the surface of the virtual filling loess, can effectively eliminate the foundation collapsibility, greatly reduces the void ratio of the virtual filling soil body, improves the foundation bearing capacity and greatly reduces post-construction settlement.

Compared with the prior art, the utility model has the following advantages:

1. the structure of the utility model greatly improves the overall mechanical property of the collapsible loess road foundation with large thickness by virtual filling;

2. the structure of the utility model eliminates collapsibility by filling the water filling filler layer, compacts deep soil body by self weight of soil body of the water filling filler layer, compacts shallow soil body by compacting layer, and has good control effect on settlement and deformation of the collapsible loess road foundation with large thickness by virtually filling;

3. according to the utility model, the water injection filler layers and the clay layers are filled in the filling holes at intervals, namely, the water injection filler layers are filled in a sectional and fractional manner and blocked by the clay layers, so that the problem of hole collapse of water injection is effectively avoided, the deep filling is ensured to be subjected to water soaking treatment, and the water injection has no pollution to the surrounding environment;

4. the reinforced cushion layer is arranged below the road embankment, so that the bearing capacity and the waterproof performance of the road foundation are effectively improved;

5. the utility model has safe and reliable structure, convenient construction method, full utilization of resources and remarkable comprehensive technical, economic and social benefits.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

In the figure: 1 is an undisturbed foundation; 2 is dummy loess; 3 is a natural ground; 4 is a filling hole; 4-1 is a water injection filler layer; 4-2 is a clay layer; 5 is a ramming layer; 6 is a reinforcing cushion layer; 7 is a road embankment.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in the foundation treatment structure for the collapsible loess roads with the large thickness, a plurality of vertical filling holes 4 are formed downwards on the surface of the virtual filled loess 2, water filling filler layers 4-1 and clay layers 4-2 are filled in the filling holes 4 from bottom to top at intervals, a rammed layer 5 is arranged on the surface of the virtual filled loess 2, a reinforcing cushion layer 6 is paved on the rammed layer 5, and road embankments 7 are paved on the reinforcing cushion layer 6.

The lower end of the filling hole 4 reaches the undisturbed foundation 1.

The width of the ramming layer 5 and the reinforcing mat layer 6 is greater than the width of the toe of the road embankment 7.

During construction, filling holes 4 are formed in the virtual filled loess 2, the apertures are 0.2-0.4 m, the hole sites are arranged in a regular triangle, the hole spacing is 2-4 m, the hole depth is dug from the natural ground 3 to the undisturbed foundation 1, the transverse arrangement range of the filling holes 4 is not smaller than 1/2 of the hole depth outside the 7 slope feet of the road embankment (namely, the transverse arrangement range of the filling holes 4 extends outside the 7 slope feet of the road embankment, and the extension length is not smaller than half of the hole depth of the filling holes 4). Filling a section of water injection filler layer 4-1 (the water injection filler layer 4-1 is filled by water permeable filler, tamping is carried out after filling, and water injection is carried out), then filling a clay layer 4-2 (the clay layer 4-2 is filled by water impermeable clay filler) at the top of the section of water injection filler layer 4-1, then filling a second section of water injection filler layer 4-1, and sealing by the clay layer 4-2, filling the filling hole 4 according to the method, wherein the length of each section of water injection filler layer 4-1 is 8-10m, and the clay layer 4-2 can not be filled after filling the uppermost section of water injection filler layer 4-1. And then dynamic compaction is carried out on the surface of the virtually filled loess 2 to form a rammed layer 5, 2000-6000 KJ can be adopted for ramming, the rammed points are arranged in a regular triangle, and the transverse treatment range of the rammed layer 5 is not smaller than 3m outside the 7 slope feet of the road embankment. And (3) constructing a reinforced cushion layer 6 after the foundation is stabilized, backfilling with cement stabilized soil or lime stabilized soil, wherein the thickness is 0.3-0.5 m, and the transverse treatment range is consistent with the rammed layer 5. After which the road embankment 7 is filled.

The soil body excavated in the filling hole 4 is used for dynamic compaction and settlement of backfill soil (namely backfill earthwork of undisturbed ground after dynamic compaction and settlement), so that the external transportation of residual soil is avoided.

Claims (3)

1. A virtual filling large-thickness collapsible loess road foundation treatment structure is characterized in that: a plurality of vertical filling holes (4) are downwards formed in the surface of the virtual filled loess (2), water filling filler layers (4-1) and clay layers (4-2) are filled in the filling holes (4) from bottom to top at intervals, a rammed layer (5) is arranged on the surface of the virtual filled loess (2), a reinforcing cushion layer (6) is paved on the rammed layer (5), and a road embankment (7) is paved on the reinforcing cushion layer (6).

2. The foundation treatment structure of a collapsible loess road with a large filling thickness as set forth in claim 1, wherein: the lower end of the filling hole (4) reaches the undisturbed foundation (1).

3. The foundation treatment structure for a collapsible loess road with a large thickness in a virtual filling manner as set forth in claim 1 or 2, wherein: the widths of the ramming layer (5) and the reinforcing cushion layer (6) are larger than the width of the slope feet of the road embankment (7).