Flood control, seepage prevention and dust prevent

The ash yard is located in the southwest of the power plant. It is a typical Valley ash yard, with a straight-line interval of 0.5 km from the power plant. The ash yard is located in an east-west Degou Valley, the terrain is broken, and the bottom of the ditch is high in the East and low in the West. The ditch is narrow and the slope wall is vertical, with a slope of nearly 90 ℃, in a "U" shape, and the ditch is 60M-80M deep There is seasonal water at the bottom of the valley, and the dam site area is located in a relatively narrow downstream gully. The slope surface of the ash dam is waterproof to prevent surface water infiltration and improve the geological environment of the slope, thus causing collapse

2. Detailed method

2.1 flood control and drainage system

the ash yard is provided with 1 longitudinal blind drainage ditch, 3 longitudinal blind drainage ditches and 6 vertical blind drainage ditches to form the ash yard drainage system. When stacking ash in the ash area of the first team, start stacking ash from the front of the rockfill dam to the design elevation of 1152 meters, stop stacking ash in the first ash area and start stacking ash in the second ash area. The ash surface of the first ash pile area is covered with 300mm thick plain soil. At the same time, Tao Weijian, a key sponsor of "Fudi talents" entrepreneurship in 1# Jurong City, also took root in the park with his environmental protection shell project, vertical drainage blind ditch slope making. In this way, after the initial dam and the compacted ash dam have all retained the flood in the reservoir area, the flood will be discharged downstream to the ash dam through the longitudinal blind drainage ditch and the No. 2, 3, 4, 5, and 6 vertical blind drainage ditches. When the ash in the second ash stacking area is 10 meters away from the No. 4 and No. 6 vertical drainage blind ditches, stop stacking the ash in the second ash stacking area, start stacking the ash in front of the middle rolling homogeneous earth dam to the design elevation of 1190m, operate the final retaining dam of the ash yard to retain all the flood in the reservoir area, and then lead the flood into the vertical drainage blind ditch through the vertical drainage blind ditch, and then discharge the flood to the ash dam

the longitudinal drainage blind ditch in the ash yard shall be constructed together with the initial dam construction. During the ash storage process, the vertical drainage blind ditch shall be increased step by step with the reduction of the ash stacking surface, and each increase shall not exceed 3M, and the height of the top of the vertical drainage blind ditch above the ash stacking surface shall not be less than 1.5m. In the process of ash storage, the ash stacking surface should form a certain slope and vertical drainage blind ditch to facilitate drainage; When the ash yard is closed, the top of the vertical drainage blind ditch is 1.5m higher than the ash stacking surface, and gravel is covered around the top of the blind ditch to prevent blocking

2.2 during the operation of the ash storage yard, strengthen the inspection, especially before and after the rainy season, strengthen the observation of the downstream slope. If you find the phenomenon of slope falling, collapse, cracking and so on, you should state it in time and deal with it urgently to ensure the safety of the slope

2.3 anti seepage geomembrane fragments

the anti-seepage geomembrane is adopted for the anti-seepage of the ash yard of the project, and the scope is to lay the geomembrane at the bottom of the ditch, from the downstream to the downstream, and the downstream membrane is pressed on the artificial membrane. And ensure the following technical requirements

geomembrane data

specification and model: 200g/m2/0.3pe

mass per unit area: ≥ 500g/m2

mechanical characteristics:

① the breaking strength is greater than that of 7.5kn/m,

② the tear strength is greater than that of 0.25kn

③ the CBR bursting strength is greater than that of 1.5kn

hydraulic characteristics:

① the vertical infiltration system, and the smaller the sensor is, the higher the accuracy is: less than cm/s

② the impermeability of the base material 2.2 the management mode of raw materials and auxiliary materials is more clear: greater than 0.5MPa

2.4 about controlling ash pollution

wet ash rolling and ash storage, Our factory faces up to the environmental pollution that can be caused by the flow of fly ash and ash slag. Ash compaction and regular watering of ash surface are the primary means to control fly ash

afforestation is not only the demand of greening the environment, but also the primary method to control wind power and fly ash. Therefore, Populus tomentosa and Rosaceae plants are planted around the ash storage yard and watered on schedule

the residual ash left by the carriage board and tires is the primary part of the ash residue scattered along the way. There are two kinds of notices: dynamic grasping and hydraulic grasping. The ash transport vehicles should be washed regularly to eliminate the ash source. Special personnel shall be assigned to patrol and clean the ash transportation road from the plant to the ash yard to maintain an excellent operating environment. The empty train must stop washing

all relevant parts of the above measures must be strictly implemented to ensure that there is no Enron accident and environmental disaster