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Shotcrete and simple support. 3) When excavation Diameter> 5.0rn time, no arch support can produce a large cave, wall and sometimes loss of stability, the construction of steel arch support to be taken to hanging on shotcrete and concrete,[link widoczny dla zalogowanych], if by the Ground Water even more the need to strengthen a support measure. 5 Conclusion convergence measured by determining the mechanical parameters of surrounding rock and the evaluation of the stability of surrounding rock, in the construction phase of great importance. Based on the measurement values to determine a more realistic,[link widoczny dla zalogowanych], reliable and safe construction measures, the reservoir generation tunnel section Changma O +030 ~ 0 +055 section the convergence of tuff breccia measurement hole of the lower body, shaft excavation and grouting gallery has played a guiding role in the excavation. (Continued from page 5) and this year only 63.69rn, lrn much lower than in the past. Weihe River is similar to the Yellow River, the reservoirs can use (can be combined with Dongzhuang Reservoir) and man-made flood to reduce the elevation of Weihe River, such as flow 800 ~ l500ITI. / S flood to scour the lower reaches of the Weihe River sediment; Forward visitors to consider the introduction of the lower Weihe River water erosion, such as water diverting the Wei, Wei River to other people. 2.3 The use of mechanical mining machine mining is a way to control an important means of dredging the rivers, in a short period of time can be achieved remarkable results. Yellow River dredging vessel used is the use of high-pressure nozzle to direct a powerful stream bed, so that the sand roll up to play a lower elevation of purpose. The Weihe River during the flood, the flood of long duration, slow, seriously affecting the flood, YRCC emergency dredging vessels rushed to the tune 9 the intersection of the Weihe River and Yellow River, to reduce the river elevation, increasing the flood line Hong speed, and good results. 2.4 Governance Nanshan tributary of Weihe River basin management is to reduce the primary means of sediment, in recent years with the Water and Water Protection for the development of sediment has been made in reducing some of the results, should continue to develop water resources, water conservation work, the Weihe River water and sediment regulation, governance for the Weihe River to create a good condition. Floodplain sedimentation tank change and the transformation of two folders China is one of the important part, should be a unified plan, planned, step by step implementation. 3 Results versed (1) not to flood the Weihe River over the years, this year's floods to the people sounded the alarm. To attach great importance to the occurrence of floods, improve flood control,[link widoczny dla zalogowanych], against the historical annual maximum flood to do the preparatory work,[link widoczny dla zalogowanych], we must fully achieve the \(2) Over the past decade, the Weihe River water and sediment has the following characteristics: ① sharp drop in the amount of water and sediment; ② a high silt content in the probability of low water flows increase; ③ small peak high sediment increased significantly; ④ slightly smaller particle size of suspended sediment. (3) hampered the Weihe river floods every year to raise the road, because of silting and the river bed elevation; Weihe River \Unified planning and management of Weihe River, based on the present reality, seeking truth from facts. The author believes that: ① the use of mechanical mining methods to decrease the lower Weihe River elevation; ② Weihe river training, river discharge capacity increases, reducing river siltation; ③ use of water and sediment regulation and the introduction of Dongzhuang reservoir for the water washed off the lower Weihe River; ④ In the long perspective of the development must adhere to in order to carry out the whole basin of the Yellow River Forest-based ecological construction,[link widoczny dla zalogowanych], restoration of vegetation, in order to curb soil erosion.
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