Floor of the new user's thought reservoir reinforcement project

Abstract In order to protect the new family stability and security of the reservoir floor, the new status of the reservoir floor households, that is stability, seepage, flood control, flood the analysis and make relevant suggestions and measures to promote the safety of new households Ping reservoir operation.

Keywords: new households Ping reservoir; reinforcement; dam safety; stability; seepage
An overview of new households Ping Reservoir
1999 after experiencing flood once every hundred years, Manas Manas River Management Office to account for new reservoirs to reinforce flat major policy decisions, in the reservoir during the flood of new households Ping danger again and again, making the new user Ping Reservoir serious threat to [1,2].

Ping Reservoir 1964 new households started in 1971, completed the main project, the "Cultural Revolution", the work spot maintenance workers, early 1972, using the reservoir began filling, slope protection facilities of the project due to lack of maintenance depend on grass shoots, barely water 1 100 to 1 200 million m3, the dam has many vertical and horizontal cracks appeared, had been ill for many years running. After several reinforcement after the operation has been greatly improved. At present, the average reservoir depth of 5m, a maximum depth of 6.7m. homogeneous earth dam type for the maximum height of 10.3m, crest width of 5m, dam bottom width of 45m, dam length 10.8 km, the dam upstream of the concrete slope protection 8.15km, the remaining soil to 1.0:2.5. Reservoir facilities capacity of 3 0,000,000 m3, is the largest higher authorities limited storage capacity of 2 200 million m3 (including siltation, the storage capacity), the annual adjustment of water 6 0,000,000 m3, 2000 annual water Volume 24 9,560,000 m3, irrigation area of 31,000 hm2. Reservoir diversion canal for the Mo canals, drains discharge total field is the new main channel lake, reservoir drainage culvert new households Ping rectangular reinforced concrete culverts for the holes, hole high-1.8m, width 1.8m, culvert length 41m, 7m each hole set a settlement body seam. culvert gate wells located in the central chamber, the gate well built flat steel gate, door size of 2.2 ~ 2.3m. culvert maximum discharge flow 32m3 / s, not set the spillway. Tacitus Kuta Xi River water downstream of the weir there is no reservoir spillway, discharged all of its flood of new families into the reservoir floor, the new indoor floor reservoir because of its special geographical location and characteristics of operation with inter-basin, the original reservoir for the injection, in assuming the Tacitus River Reservoir spillway flow, you must set the spillway .

Ping reservoir of new households in the 30 years running a serious siltation, sediment containing the one hand, large amount of the Manas River, on the other hand Tacitus reservoir discharged due to mix the sediment floods, especially before 1982, Mo without making lining the canals. As low channel capacity of soil resistance to erosion, steep slope, water erosion to Laomo canals into a 50 ~ 60m wide, 6 ~ 8m deep in the river, so that large amounts of sediment flowing into the reservoir by the year 1999 Changji State Water Resources and Hydropower Survey and Design Institute of the new household survey data show that the reservoir storage floor, the current capacity of the reservoir floor of new families has reached 7,000,000 sedimentation m3.

2 Meteorology and Hydrology and Geology
Manas County is continental arid climate zones, the overall features are: the winter cold and summer heat, temperature and diurnal temperature range in the larger, annual average temperature 6.9 ��, extreme maximum temperature of 43.1 ��, extreme minimum temperature of -42.4 ��, in a more difference 43.5 ~ 44.7 ��. precipitation less evaporation. precipitation due to the terrain, the larger North-South disparity in rainfall, total precipitation in the northern desert to 117.2mm, annual evaporation is 1 946.4 mm, the central plain area is 167.0mm The annual evaporation is 1 803.5mm, in the southern mountains to 543.5mm.

Ping reservoir for the infusion of new families of Manas river plains reservoirs, is the Manas River basin. And Tacitus Tacitus River Reservoir is located downstream of the new 5.3km southeast of households outside the reservoir floor is built on Tacitus stopped on the river River Creek Reservoir, at the upper, middle and lower three reservoirs, storage capacity, respectively 500,40,20 million m3, as Tacitus River reservoir storage capacity is too small, poor regulation and storage capacity, so often discharged flood, flood flows into the pool under the new account Ping reservoir; this new addition to storing household Ping Reservoir and fishing tasks, but also bear the Tacitus discharged reservoir flood, so the new standard household flood Ping Reservoir Tacitus also need to review the hydrologic calculation River Reservoir.

Tacitus Creek Reservoir 7 to August each year has spilled into the flood of new households Ping reservoirs, particularly under the flood of 1999 reached a total of 3 0,000,000 m3, and 7 to August is the new floor downstream users of irrigation Mo peak season irrigation canals the reservoir water level is generally between 426.0 ~ 426.1m, capacity of 1 200 to 1 400 million m3, the water level is close to the reservoir design flood level 426.96m, Tacitus River Reservoir discharge volume is clearly under the floor of the new family the safety of reservoirs a great threat. This healthy, Block 2, when the reservoirs were not considered in the revision to this threat, until recent years, as Tacitus River Reservoir, a large amount of the next flood, it caused the leadership of the attention.

New households in the large flat landscape reservoir unit, located in the Manas River alluvial fan with fan fringe diving overflow, groundwater level 0 ~ 1.5m. Library dam exposed strata of the Quaternary loose deposits, the main lithology are silt, silty clay, silt sand, the coarse and so on, from top to bottom as silt stratum structure - silty clay - clay, sandwiched between layers of varying thickness throughout the body through the powder sand, into jagged distribution. gullies or low-lying terrain in the deposition tank Bay in the sand with the thickness of the larger, multi-distribution in the horizontal direction into a discontinuity.

Building of the reservoir, due to the long-term storage, has a large area around the dam submerged. Is a serious salinization of land submerged, diving salinity 5 ~ 10g / L, water chemistry type C work-Na type water. Soil Engineering geological characteristics of variation, usually within 3 ~ 5m in depth into a soft plastic state, the lower bearing capacity [3,4].

According to zoning map of peak ground acceleration of new households Richard Manas Ping reservoir area, the earthquake acceleration is 0.15g, fortification intensity is 7 degrees. Reposted elsewhere in the Research Papers Download http://www.hi138.com 3 Reservoirs problems and the task of reinforcing
By 2000, the dam safety appraisal, that the poor quality of the main dam dam filling, slope instability, foundation without a thorough treatment, serious leakage, reservoir sedimentation seriously affect the effectiveness of the play reservoirs, the reservoir the actual standards against floods below the Ministerial Water Control Project is the use of reinforcing the recent flood standards, identify new customers for the three dam dam floor for dangerous library.

Dam exists for the above problem, reinforcement construction design has been approved by higher authorities under the <"New Primary Reinforcement of household floor DESIGN"> design and Development of new households Ping reservoir management unit - Mana Sri Lanka off line manager at the Manas river views, the specific design tasks are: First, from a security point of view, the new floor is not library users additional spillway. Second, update the dam reinforced concrete slab slope protection against waves; the same time, to improve performance of the dam seepage, slope the concrete slope protection panel in the lower berth of geomembrane; vertical laying of foundation of geomembrane to improve the dam against erosion, reduce the osmotic pressure within the dam foundation seepage control of head and capacity. Third, the dam reconstruction body wave wall, so heightening, strengthening treatment. Fourth, the Gobi dam surface overlay, in order to facilitate pedestrian traffic to facilitate reservoir management. Fifth, bank deposit mud treatment measures.

4 treatment measures
(1) addition of new households Ping reservoir spillway. In the face of 300 year flood or larger floods, lack of flood discharge culvert, you can enable the spillway in flood control, flood discharge, in order to promote the safety of the dam.

(2) reinforcement of concrete plates revetment update wave. There 8.1km-long dam need to update the concrete slab reinforced slope, while laying on the slope geomembrane, the weakest part of the foundation of geomembrane laid vertically to increase dam, dam against erosion and seepage capacity. The method of reinforced earth dam, seepage has a good effect.

(3) According to the results of Flood Routing, upper reservoir flood season as 427.00m, design flood level and the check flood level was 427.65 m and 428.19 m, to determine wave height top of the wall should be 430.55m, the principle of top elevation to 429.45m, the high wave wall is 0.8m, and the wave wall can not withstand water pressure; this end, the new wave whole dam wall, reinforced concrete retaining wall structure type type.

(4) In order to reduce the dam piezometric head, set the stick in behind the dam slope drainage; In addition, the back of the current dam should be done to clear the drains deeper water behind the dam to pass unimpeded.

5 pairs of new households Ping Thinking reservoir reinforcement project
New households are involved in Tacitus Ping River Reservoir Reservoir flood diversion weir plain reservoir, with a flood task. The works since September 6, 2002 to November 2003 started almost complete, February 11, 2003, the Group of Experts New user Ping dam safety appraisal, February 25, 2003 and the new floor Household water storage reservoir reinforcement for acceptance before the stage. the author of the design and construction of the project has the following aspects of knowledge and thinking.

(1) New families Ping reservoir reinforcement project design in the calculation of dam stability, seepage analysis and computation is the calculation of the dam, while the foundation calculations, foundation seepage based evaluation is not enough. This did not cut off flow, behind the dam is Management Chung appears to be studied, but there will certainly be seepage, the size must be further determined. proposed dam must be calculated and the requirements of sub-calculations.

(2) frost layer is sand and gravel, if the sand is not good, although one panel slope bottom drainage holes, but if not timely drainage, slope backwater, can ensure that sufficient water has to be studied. Recommended operating management Do not allow drainage failure.

(3) Reinforcement of the new household floor are carried out on the dam foundation seepage, but the foundation underneath, slope, side walls will freeze up there whether it would take the water, seepage gradient changes, resulting in erosion has yet to be further exploration.

(4) gate diameter smaller part of the end of the culvert, the front wing wall did not move. Proposed gate should be complete before the eight-character wall reconstruction, culverts accidents import set point. New households Ping reservoir reinforcement works have been completed, run normally, but as the owner can not be paralyzed in their thinking and understanding, should strengthen the importance of dam safety, strengthen the observation, patrol dam; have a rescue team, reserve a certain flood control supplies, strengthening dam 24h patrol duty, especially in the spillway of the inspections to ensure safety of reservoir.

6 References
[1] Robin Bridge. Back Bay reservoir dam dam stability analysis [J]. Information Development and Economy, 2009 (31) :222-224.

[2] Chen Yixia. Of small reservoirs reinforcement technique and material Application [J]. West China, 2009 (32): 30,27.

[3] Chen Jinpeng, Qiu Changjun. Rockfill prism Gaozhou reservoir reinforcement project in the Application of [J]. Economic & Trade, 2008 (19) :208-209.

[4] Liu Shen Zhou. Linxian sunny dam problems and evaluation of [J]. Information Development and Economy, 2009 (28) :207-208.

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