The geological environment of mine is deteriorating constantly, and disasters and accidents occur frequently

China's mineral mining has a long history, in a long period of time, China's mineral mining technology and equipment are relatively backward, under this condition of mineral mining leads to the deterioration of mining geological environment, mining geological disasters frequently.

Life-threatening mining accidents and environmental disasters occur from time to time, and there is a gradual upward trend in recent years. According to the occurrence and development laws and characteristics of mine geological disasters in China, it is particularly important to classify mine geological disasters in detail and put forward the measures to prevent and control them according to their respective characteristics.

1. Types of mine geological disasters

At present, mining activities are still mostly confined to the Earth's surface and inside the lithosphere. Before lode mining, the geological environment of the mining area is in a stable equilibrium state. In the mining process, a large amount of earth and rock is dug out from the soil and rock circles inside the crust, which greatly destroys the geological environment and makes it in an unstable state.

Whether drilling mining, excavation mining, liquid injection mining, or open pit mining, all change the original geological environment, the appearance of this imbalance leads to the instability of the crust material, and then easily lead to catastrophic geological changes.

There are many types of mine geological disasters, which can be divided into abrupt mine geological disasters, such as mine water inrush, gas explosion, rock explosion, etc., if only from the rate of occurrence of disasters, the other is slow type mine geological disasters, such as ground subsidence of goaf, water pollution and so on.

The most commonly used classification of geological disasters is usually based on the spatial and temporal distribution and genetic relationship of geological disasters. This classification method is conducive to the in-depth investigation of the causes of geological disasters, so that appropriate prevention and control measures can be formulated according to various types of geological disasters.

The geological disasters induced by unreasonable or unscientific change of geological environment in the process of man-made geological processes basically cover all types of geological disasters except volcanic eruptions.

1. Formation disaster of rock and soil layer

Some mining geological disasters are caused by the mining activities changing the geological environment of the mining area, leading to the deformation of underground and surface rock and soil layers, and then leading to disastrous consequences.

2. Induced earthquake

The structural unbalance of rock and soil layer caused by mining activities is reflected in earthquake and fault dislocation. A short time of severe fault dislocation is easy to produce induced earthquake.

The shallow earthquake induced by man-made geological change has a small depth, but the harm and destructive power are very great. Small magnitude earthquakes may cause drastic changes in underground and surface rock and soil layers, thus causing harm to buildings and surface structures.

3. Fault dislocation

Fault dislocation is also a manifestation of the structural imbalance of the circle, but because of the delayed occurrence of fault dislocation, the energy is slowly accumulated, and it is not easy to be measured and detected in a short time.

It can be predicted that with the continuous development of mining activities, the energy accumulated in the fault will be released in a short time after the mining vein is emptied, which will cause great harm, and this disaster will also have great destructive power to the mine and the surrounding geological environment.

4. Ground circle deformation

The deformation of underground rock and soil layer often leads to the subsidence, settlement and cracking of surface rock and soil layer, which leads to the geological disaster of mine with great harm. For example, mine floor and goaf collapse, mining ground subsidence, ground cracking.

The common ground collapse in mining area mainly occurs in the mining area of shaft mining. The lode burial is shallow, the ground of the mining area is gentle, and the phenomenon of ground collapse and settlement is relatively common.

In mining areas where mineral veins are buried deep and far from the surface, if slag cannot be backfilled in time, large-scale collapse, ground collapse, settlement and cracking may occur, which not only damages soil, water and buildings, but also damages public resources and buildings such as roads and reservoirs, causing greater harm.

5, slope rock mass movement

This kind of disaster is caused by the unstable structure of geological slope or surface fault edge in mining area, such as collapse, landslide, debris flow and so on. For example, the instability of mining slope often causes disasters such as rock and soil landslide, rock fall and so on, and the soil slope forms fluid soil after rain, forming disastrous debris flow and so on.

Unstable structures are formed due to unreasonable mining and stripping disorders and steep slope angles. This type of mine geological disasters mostly occur in open-pit mining or excavation mining mines.