Kyrgyzstan dewatering in karst area of ground und

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Kyrgyzstan dewatering in karst area of ground under the comprehensive approach

Measures to deal with. Such as hats coal mine collapse because of severe damage to the riverbed. Water on the threat of a large water-filled mine. Subsidence area in the rule Quantang Quantang May subsidence area creeks and streams Ding red when on the river bed under the cover Lost thinner (2 ~ 3m). The flow of small rivers of the lot, the use of clean soil stripping the base, then covered and set with cement mortar or a remediation aqueduct in two ways, a total of river training l200m. However, improvement in the Long Mu River, due to higher river flows, using the above two methods do not have control, the use of partial diversion of rivers straightened, and the new river channel was seepage. Change the river section of new flood flow 88m / s, length 524m, more than 60 million project investment. New river training works and put into use to change the water loss reduction mattress 599 ~ 2119m / h. Fork such as lead and zinc directly into the Shuikoushan bridge collapse area of the river were diverted, the purpose is to shorten the channel length, to avoid the fall area has collapsed. Initially, management of soil as long as local tap new bed, were not reinforced, less than one year due to subsidence and to stop the same, all the water poured into the ground. Canada was forced to use a concrete rule of plate reinforced concrete design and construction of mine 4 1993, seepage reinforcement of soil structure, re-construction of some 280m long artificial river, received a significant effect. Similar rainfall compared to the month, after the repair of the artificial river, underground discharge from 1516rn / h reduced to i089m '/ h, reducing the 427m' / h lower level 21.5l ~ 45, O8; drain much to save from the original of l3.3 million reduced to i0.84 million annual electricity reduced by almost 20 ~ 30oA; construction cost of a 9 million + bed less than six months to recover during the period. There Fankou Lead, Zinc Siding, Copper Mountain Copper recorded, uh mouth coal mines, coal mines and other mines to dam the river diversion works locally. Have achieved some results. (2) Xiudi dam Lanhong sides of the river bed and other low-lying parts of the subsidence area, the method can be used Xiudi prevent dam flood intrusion. For example, lead and zinc in Shuikoushan bridge collapse area was home to the partition using the same method of Grid Xiudi dams, namely, construction of earth embankment 1272m. Prevent the collapse of the region caused by a stream down so Flood immersing the disaster area. Thus, to facilitate rescue and flood, can be limited to the local disaster. Dam top elevation of the most flood elevation plus 0.2m is too high to calculate. Most are too heavy rain flood frequency P = 2, individual mines can be shorter under the mine life, or engineering and low importance to determine the specific circumstances. Practice has proved that using this method of embankment collapsed mine management division where there are dams on lead-zinc and coal mines, the effect is good. (3) dredge the river channel of the collapse area, in addition to the seepage control and reinforcement of effective measures, in order to increase the discharge capacity to maintain river flow, any conditions to clear the old river channel dredging by artificial means, increase the hydraulic gradient . Expand too much water section, can reduce water infiltration subsidence area. For example, Hill lead-zinc intake in the new river channel dredging downstream of 200m, the old river channel discharge capacity from the 20000m '/ h increases so to 30000m / h. Increased 5O, reducing flood posed by subsidence when the mine hazards. (4) drainage ditch and remove stagnant water in the subsidence area in the lower periphery of the system should be garden excavation cross section of the surface runoff to the ditches, in order to avoid convergence into the collapse area rainfall adverse consequences; in the surface water has may be increased through the collapse pit mine discharge of the lot too, should ease the drainage ditch to remove water, can reduce the potential loss of surface water leakage damaging effects intensify. For example, lead and zinc in the east where the population collapse area north of the low-lying areas along the foot of excavation of the flood control drainage ditches 1800m. Excavation of water catchment areas in the lawn of the lead gutter, have achieved good results. The karst land collapse hazard serious mining, must pay attention to control the technical and economic effects of engineering design, engineering practice shows that treatment with anti-seepage curtain grouting methods and collapse areas of the construction of surface water diversion control methods, the required investment costs more too, high precision of the original data, the design should be considered before specific engineering geological investigation of karst collapse, \Prevention programs stand a reliable basis. The design must be a variety of anti-ho program technical and economic comparison to determine technically feasible and economically reasonable optimal solutions to achieve top accounting purposes. (Continued from page 4O) must have the appropriate mill operating parameters. Concentrator mill process similar to the tidal wave concentrator grinding process conditions using a ball mill
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