How to choose the soil material of the foundation soil, and what are the requirements of the ground

The method of selecting the soil material of the foundation soil is as follows:

1. In the process of filling, various gravel soil and sand will be used, so that the filling quality and underground filler are conducive to the filling quality in the filling process;

2. Cohesive soil can be used as filler for each layer, but the water content must be checked first in the process of filling.

Whether it is within the current control range, the clay with a large water content can not be used as fill, to avoid due to water molecules.

Affect the effect and quality of its filling.

3. Fragmented turf and soil with an organic content greater than 8% are easy to deform after water absorption, which reduces its load capacity and contains water solubility and sulfate.

More than 5% of the soil, under the action of groundwater, sulfate will gradually dissolve and small, forming a cavity, affecting the compactness of the soil, thereby affecting the quality of filling in the process of filling, under the action of groundwater, sulfate will gradually dissolve for hours, forming holes, affecting the compactness of the soil, so only use the fill without compaction requirements.

4. In the case of artificial filling, artificial miscellaneous filling, the corresponding technical means should be used for analysis and management in the process of filling, and the current soil quality should be given to make a trade-off, and in its principle it is not used for foundation backfill.

If the composition is complex, the soil with poor stability does not need to be reused.

5. Silt, silty soil, frozen soil and expansive soil.

and so on can not be used as backfill material, backfill in the process of selection to give priority to the use of high-quality soil dug out in the foundation groove, the first is more economical, the second is the backfill compacted and the bottom of the pit, the original soil affinity of the pit wall. Strong.

The main cause of the foundation soil is the main reason for the settlement ------ settlement: the soil is not compact and the soil is deformed when it encounters water--- the soil with better water stability is more stable, and it is easier to compact--- sandy soil or other permeable materials--- the smaller the plasticity index or the coarser the particle of the soil--- sandy soil, gravel soil, sandy gravel soil, sand pebble soil, blast slag stone, gravel soil, etc. are good choices--- if it is difficult to obtain sandy soil--- improvement (lime soil, Two gray soil, etc.), foundation drainage (plastic plug board, gravel pile, sand pile, etc.), reinforcement (powder spraying pile, etc.), change the soil structure (strong compaction, etc.) - haha, these methods of the previous item are used only when it is absolutely necessary, many sequelae or the effect is not good, the best way to start from the root, choose a good permeable material!

What are the requirements for ground foundation soil? Kiss! Hello, I am glad to answer for you<> pro-ground engineering has the following requirements for the base soil:

1) The weak soil layer must be treated in accordance with the requirements of the design. (2) The fill should be compacted (tamped) in layers, and the quality standard of the fill can be known from the relevant topics in the first chapter. (3) It is strictly forbidden to use silt, humus, frozen Xiangshi soil, cultivated soil, expansive soil and soil containing more than 8% organic matter as fill.

4) The base soil should be uniform and compact, and the compaction coefficient should not be less than. (5) When filling the soil, it should be the optimal water content, and before the important project or a large area of ground filling, soil samples should be taken, and the optimal water content and the corresponding maximum dry density should be determined according to the compaction test. (6) The flatness of the surface of the base soil should be checked by a 2m ruler and a wedge-shaped feeler gauge, and the allowable deviation is 15mm.

Check the elevation of the cushion with a level, and the allowable deviation is 0 -50mm. If the cushion has a slope, it can be checked using a slope ruler, and the allowable deviation is not more than 2 1000 of the corresponding dimensions of the room, and not more than 30mm. As for the inspection of the thickness, it can be inspected with a steel ruler, and its allowable deviation is not greater than 1 10 of the design thickness in individual places.

Hope mine can help you <>

Do you have any other questions?

When building houses in rural areas, foundation backfill is one of the indispensable procedures, and if this process is not done well, it will bring serious consequences. Therefore, it is best to have a proper understanding of this area before building. So, let's take you together to understand how to choose the soil material of the foundation backfill and the control points of the backfill.

Cohesive soil can be selected as the soil for the foundation backfill, but it is necessary to pay attention to its water content when choosing to see if it is within the specified range. If the water content exceeds the scope of use, it cannot be used as the soil for foundation backfill, otherwise the quality of the fill will be affected. In addition, silty soil and expansive soil should not be used as soil for foundation backfill.

Control points for backfill.

1. Before backfilling, you must check whether there are caves or tree roots and other debris on the base soil, and if so, you must clean them all, otherwise the fiber residue will affect the backfill effect.

2. When backfilling, it is necessary to inspect the soil quality of the soil used in the backfill to see whether its type, water content, particle size and other aspects meet the relevant regulations. In particular, the water content should not be too high. If it is too high, it is necessary to take corresponding measures, such as loosening, drying, etc.

3. In the process of filling, if it exceeds the base surface, the edge must be compacted and its quality must be guaranteed. After backfilling, if there is no requirement to trim the slope, then the edge width can be filled in. In addition, in the process of filling, if some parts cannot be rolled, it is necessary to use manual bulldozing to fill it.

4. When the filling is completed, it is necessary to level the surface of the line, and for the parts that exceed the standard height of the jujube erection, it needs to be leveled in time, and the parts below the standard need to be leveled.

Article summary: The above is all about how to choose the soil material of the foundation backfill and the control points of the backfill, I hope it will be helpful to you. If you want to know more about it, please stay tuned to Qeeka Home.