Pit filling after mining

1. I've seen America; Subsidence Crisis & quot; The chemical foam backfill is used in the film. When used, the chemical foam is used to make the medicament dilute 100 times the times, but this medicine will harden in 10-60 seconds after exposure to air, so it can fill a lot of space. First, take precautionary emergency reinforcement

if the island countries with limited area also migrate to the sea? In the lake? River?

2. First of all, there are two kinds of depression formation, one is the real geographical situation, such as basin, lake, karst landform, and the other is the terrain error caused by human factors. If we don't fill the depression, when we analyze and calculate the flow direction, we will often get the unreasonable or even wrong flow direction, which will also affect the operation of later confluence accumulation and river extraction.

3. There is nothing wrong with the compensation for the grain output of that year. It is also necessary to backfill the land, but it must be able to cultivate after backfilling, otherwise it is necessary to compensate for the cost of re cultivation

4. Landfill should be used to protect the ecological environment and eliminate potential safety hazards.

5. You're going to add an upgrade, but I forgot which one. You can try which one again, but it seems that you need to add several times more power consumption

6. It's best to seek legal solutions instead of mining privately, which may be unreasonable. If the employer has the mining right to the mine, it is self-help and justifiable for you to dig and sell the mine privately. If the mining right belongs to others, the private mining may have to bear the adverse consequences
labor arbitration or litigation can be initiated, and there will be compensation after the court's judgment. When executing the judgment, you can apply to the court to auction the mining right, and use the auction proceeds to compensate you for your wages.

7. Earthwork backfilling in Civil Engineering:
cleaning the foundation pit (trench) bottom floor → checking the soil quality → layered soil paving and harrowing → ramming compaction → checking the compactness → trimming and leveling acceptance
specific explanation:
1 before filling, the garbage and other impurities on the foundation pit (trench) bottom or floor should be cleaned up; Before backfilling the fertilizer trough, it must be cleaned up to the bottom elevation of the foundation, and the falling loose garbage, mortar, stones and other debris must be removed
2 check whether the quality of backfill soil is free of impurities, whether the particle size meets the requirements, and whether the water content of backfill soil is within the control range; If the water content is too high, measures such as loosening, drying or even mixing with dry soil can be adopted; If the water content on the backfill is low, measures such as watering in advance can be adopted
3 the backfill should be spread in layers. The thickness of each layer shall be determined according to the soil quality, compactness requirements and machine performance. Generally, the soil thickness of each layer of frog rammer is 200 ~ 250rn; Manual tamping shall not be more than 200 mm. After each layer is paved, it is raked
4 each layer of backfill shall be rammed at least three times. Ramming should be one ramming pressure half ramming, poor ramming phase, row connected, vertical and horizontal cross. And the so-called "water tamping" method of watering to make the soil sink is strictly prohibited
5 when the deep and shallow foundation pits (grooves) are connected, the deep foundation should be filled and tamped first; When it is filled to the same elevation of the shallow foundation pit, it shall be tamped together with the shallow foundation. If it is necessary to fill and tamp in sections, the joint should be filled in a ladder shape, and the height width ratio of the ladder is generally 1 ∶ 2. The staggered joint distance between upper and lower layers shall not be less than 1.0m
6 foundation pit (trench) backfilling should be carried out on both sides or around at the same time. The elevation of both sides of the foundation wall should not be too different, so as to avoid squeezing the wall; For the long trench wall, the internal support measures should be adopted, and then the earthwork should be backfilled outside
7 when backfilling the house core and pipe trench, in order to prevent the displacement of the center line of the pipe or damage to the pipe, manual filling and tamping should be used on both sides of the pipe; It should be done on both sides of the pipe at the same time until the pipe is more than 0.5m. Only when the pipe is not damaged can frog rammer be used for tamping. At the interface of the tape, around the anti-corrosion insulation layer or cable, fine granular material shall be backfilled
8 after each layer of backfill is compacted, ring knife sampling should be carried out according to the specification to measure the mass density of dry soil; After meeting the requirements, the upper layer of soil shall be paved
9 finishing and leveling: after the filling is completed, the surface should be leveled by wire, and any place exceeding the standard elevation should be leveled in time according to the line; Where the elevation is lower than the standard elevation, the soil shall be filled and compacted.

8. obsession

9. The whole rule has been settled for two weeks, but the specific figures, such as the specific rates and proportions, were settled slowly after bitmax.io ran many models recently.

10. Subsidence is a geological phenomenon that we often hear about recently. There are many reasons for this, not all of which are caused by over mining. There are three reasons for the occurrence:
(1) karst landform. The limestone deposits in South China are generally thick and easy to form karst landforms. There are cavities proced by water flow in the deep underground, and ground subsidence will occur under stress or vibration. This is the reason why the south is prone to subsidence
(2) over mining. The excavation of underground mine is often completed by shaft, inclined shaft and underground roadway, so the underground cavity is proced. If it is not filled, it is easy to change the surrounding rock stress, become unstable and cause ground subsidence
(3) inferior construction. Many of the ground subsidence phenomena in many cities are e to the lack of technology and quality control ring the construction, and the use of low-grade cement and steel bars, which leads to the low level of concrete. Under the pressure of buildings and traffic, ground subsidence may occur
among them, there are many requirements for ground pressure management in mining science. At the same time, filling method will be adopted to prevent the occurrence of ground subsidence. In engineering, ground subsidence can be eliminated. But whether it can be done depends on the specific situation. The first is natural conditions, which can only be achieved through monitoring
the rapid use of groundwater in cities will lead to the decrease of surface water level, which will lead to the decrease of pore water pressure in sandy soil, break the original stress balance and lead to land subsidence. But this settlement is often the whole settlement, which is different from the small-scale subsidence.