ghd australia Tuka River Hydropower Station Excava

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Tuka River Hydropower Station Excavation Slope Design and Construction

Range 330.5 ~ 337m range with the collapse of the phenomenon of unloading, slope 343m unloading platform, many cracks appear, to prevent the occurrence of the wider collapse of the slope, take the following countermeasures: ① piling up gravel in the range of slope collapse to prevent the continued collapse of the slope; ② elevation 343m platform for all the cracks sealed with cement mortar; ③ jump positions by way of pre-poured concrete paste the slope between the permanent structure as part of installation. 5 Slope Excavation works and other measures taken by other support measures 5.1 (1) To avoid causing dam repeatedly soaked by water softening the bedrock, the bedrock surface elevation 330.5m promptly closed, and do good water discharge facilities. Water seepage on the slope of the site by playing random drainage holes and laying drainage (steel),[link widoczny dla zalogowanych], lead time will be routed to the appropriate location of water seepage. (2) all the cracks that have collapsed at the use of shotcrete were closed. (3) dug 23m each time under the support, support can continue to the next after digging, an increase in the elevation 323m 1m Ma, a wide and 50cm thick pouring paste elevation 323326m slope concrete retaining wall (laid at Slope 25 steel mesh, steel grid spacing of 20cm × 20cin), and the next digging process,[link widoczny dla zalogowanych], close attention to the elevation of 330.5m above the stability of the slope; daily observed values of prestressed anchor the force, through the cable slope deformation and stress monitoring, analysis of slope safety, slope excavation of guidance and support has played a positive role. (4) The landslides caused by the opening line of the slope closer to the mountain, in order to prevent further collapse and does not affect the installation of a set of well structure between the body, the spirit of \slower than the original design of 1:0.5 slope is 1:0.79, the slope becomes less elevation 323m 1:0.67; and small pipe made of grouting advance support and uplift them experiment, the provisions of the pullout resistance of not less than 120k_N. According to the actual geological conditions, in line with the principle of economic rationality. Let each hit a row of small ducts. 5.2 Application of grouting small pipe using {l48mm small pipe seamless steel pipe, steel pipe length 6m, exposed 20cm (easy to pinch grouting), asked the distance in lm × 1m (if necessary, reduce the spacing between the small catheter steel to increase the degree of support.) Excavation along the contours of the depression of the catheter 5. Beat (if elevation, after grouting plug nozzle with a wedge to prevent the slurry reflux), a small catheter from the grouting surrounding rock major role in the consolidation of its size, after the excavation of rock formation above the load profile body to facilitate the next step of construction. Grouting done before the beginning of the slope jet C207 Queensland reinforced concrete, thickness 50mm, grouting pure cement paste, the concentration ratio level is 0.6-0.7:1. To prevent the grouting slurry pediment, who rocks in a small catheter within the range {l6 ~ 12mrn drilling slurry overflow hole, was plum-shaped layout, spacing 20cm (to prevent the grouting appeared dead), leaving behind the 20cm, so then grouting useful. Construction of the first blow with the wind pipe hole drilling process,[link widoczny dla zalogowanych], the master of the original rock protection, must not be brutal construction. Filling should note the following: (1) injection pressure should not be too great and should be maintained at 0.3-0.4lVlPa appropriate; grouting port maximum pressure 0.5MPa or less strictly controlled to prevent the fracture face . Speed control into the pulp, generally each catheter into the plasma volume control in the 30IJmin less. If the pressure rise, flow reduction, although the amount has not reached the calculated value grouting, but the orifice pressure has reached 0.5MPa, the end of grouting. (2) the grouting must pay close attention to gauge and found that the pressure is too high,[link widoczny dla zalogowanych], need to stop and remove plug perfusion; (3) grouting, such as occurs slurry pipe flow from other phenomena, the nozzle should be in serial plasma plug the pipe with a wedge at the mouth of the tube to be re-grouting disconnect wedge, and debris high-pressure air clean tube, and then grouting, grouting until the end of all. 6 Conclusion slope stability problem is often encountered in hydraulic engineering problems. Directly determines the stability of the slope the feasibility of the construction project, the construction of the project investment and safe operation. Especially high slope excavation and support more difficult, due to lithology, tectonic fissure, a lot of groundwater and other factors, and impact and duration of excavation by the tight restrictions on the rock slope reinforcement measures , it is difficult to implement all the time. The earth station at the right bank of the Neckar high slope excavation, because of Participation in close collaboration with all units in a timely manner of the slope collapsed and cracks appeared to take some effective measures of reinforcement works, slope opening dredging project was successfully completed, but still works in the future continue to sum up the experience accumulated, it is best to take some advanced prediction tools and preventive engineering measures.

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