The procedure and auxiliary measures for safely driving of TBM(tunnel boring machine) across poor geologic zones are presented. The effects of the poor geologic conditions such as collapse, rock blast, sudden water inflow, soft rock, and swelling rock on TBM construction safety and the corresponding countermeasures are introduced for reference.
Analysis on large span comprehensive mining face water burst in No. 5308 thick coal seam, Baodian Coal Mine
The disaster of mine water burst is one of the five mine disasters, mine behind the water has an expansive future and the forecast of mine roof water inrush grade becomes an extremely important content in the mine water inrush prevention and cure, along with the increase of energy sources requirement by country economy.
There into , the data information administer system offers data origin for the forecast, can be data file edited、 amended, can solve the problem of the mine roof data information administer and renewal effectively, and provide better service for information demand, analyze and water burst forecast.
The mine roof water burst forecast subsystem ,witch is based on fuzzy matter-element model theory ,makes the best of the water burst grade's fainrness character and single complication appraise' incompatibility character, carry through diversion of relationship modulus and single complication subjection degree, then confirm the complication weight by using arrangement analyze to appraise mine roof water burst grade.
Calculation of ground water inflow to wells in river valleys with account for silt content and nonuniformity of the channel depo
A Method for the Investigation of Fast Water Inflow and Outflow by Changes in the External Osmotic Pressure
Rapid Water Inflow and Outflow in Plants with Roots Treated with Salt Solutions of Various Concentrations
A new highly sensitive and rapidly responding gravimetric method was used for the investigation of rapid responses manifesting in water inflow and outflow from roots in the intact seedlings of tomato Lycopersicon esculentumMill.
The notable characteristics of water inflow and outflow included a very short lag period, a gradual pattern, and a low selectivity to different salts.
Moreover, karst terranes are quite often haunted by a series of engineering problems, such as water gushing into mines or transportation tunnels; leakage from reservoirs; and failure of building foundations.
Hundreds of water inrush accidents have occurred and over 30 mines have been flooded, resulting in heavy economic losses and casualties.
Hundreds of water inrush incidences have occurred in which a large amount of water suddenly flows into tunnels or working faces under high potentiometric pressure and over 30 mines have been flooded over the last 20?years.
When the water pressure in the underlying aquifer exceeds Phf, a wedging effect takes place within the fractures of the geological barrier and, as a result, water inrush occurs.
Based on the test results, a new safety criterion for water inrush was derived for mines and it has been successfully applied to mining practices with the minimum effort of dewatering in the karst aquifer.
Water inrush and environmental impact of shallow seam mining