Although the ore body and surrounding water exists, but only through a channel, they can enter the well lane formation water or water inrush. Water channel can be divided into the void formation, fracture zone channel natural formation and caused by mining activities such as artificial water channel two.
1 natural water conducting channel:
(1) fractures and fracture formation zone. The hard rock in the deposit, joint type fracture which is developed parts communicated with each other can form fissure water channel. On the basis of exploration and mining information, we put the fault zone can be divided into two categories, namely, water resisting fracture belt and permeable fracture zone.
(2) the karst channel. Karst space extremely uneven, can from the hole until the huge cave soluble small. They can be communicated with each other, become the communication between various water channel, also can form a water filled pipe isolated. Many of China's metal and nonmetal mines, have suffered. To understand this channel, the key lies in the characteristics of karst water in Karst and can accurately grasp the development of mining area.
(3) the pore channel. The pore channels mainly refers to the pore water in loose layer of particles. It can meet the deep overburden layer of bedrock deposit in the mining and mining. The former is homogeneous gushing water, only in the large particle area and rich water area can lead to water inrush; the latter in well construction period harm. Such channels can transport the aquifer water into the well lane, also can become a communication channel surface water.
2 artificial water channel this channel is due to the unreasonable exploration or mining caused, should put an end to such channel.
(1) the roof caving slit channel. Caving mining caused pervious fissure, such as in overlying water, can lead the water into the well lane, resulting in water inrush.
(2) floor breakthrough channel. When the filling layer under indirect roadway floor, will be in the water pressure and mining pressure, destroy the floor aquifuge, artificial fracture passage, leading to lower high pressure groundwater influx of roadway caused by water inrush.
(3) the drilling channel. In all kinds of exploration drilling can be communication deposit, aquifers or surface water, such as in exploration drilling closed after the end of the poor or no closed, mining exposes drilling will cause the water inrush accident.
Detection and analysis technology of 3 water conducting channel detection technology of water transmitting channels mainly include:
(1) for detecting aquifer and water conducting structure used in audio power penetration;
(2) to probe the geological structure in seismic exploration instrument and combination logging tool;
(3) through the geological structure detection level;
(4) the energy spectrum were measured for groundwater age judgment with the isotope mass spectrometer on underground water environment of radioactive isotopes 3H, l4C;
(5) by ion chromatography, high pressure liquid chromatograph of mine groundwater constant, trace ion analysis.
------line----------------------------
- Link
-