摘要
不同水头高度的电站引水渠存在不同的经济地质、工程地质环境.本文以全省82条电站渠道资料为背景,进行初次分析研究,提出了较优的经济与地质方案。
The karst environment Problems of diversion canals in Guizhou mountain areas are mainly landslip, collapse, leakage, sinking and water destroy ing, etc. , of which the landslip and collapse are the primary problems.
According to the statistic data collected from 82 power station diversion canals, the landslip and collapse make up 20% of all the problems. The problems are caused because building canals changes the natural balance stress of the original slopes and the stability is lowered under the water power and leakage pressure action.
The disadvantageous rock-body texture of high-steep slopes is the internal factor causing the landslip and collapse to occur.
According to the texture types of slope stability, there are four types, i. e. stable type, basically stable type, unstable type and locally unstable type. Based on a lot of data analysis, different high-head canals show different stabilities and the lower-head canals show more problems of landslip and collapse than both high-head canals and middle-head canals. The reason is that the lower canals are mainly distributed in loose accumulation on slopes and the higher canals are located in the weathering zones of upper high-steep slopes, only middle canals are stable rocky slopeside, so the problems are rare.
The economical effect of diversion canals of power stations shows that the higher the water heads, the smaller the discharges; the bigger the installment capacity, the higher the economical effect. But the investment in building power stations on middle-head canals is the lowest, and the engineering problem is also small. The best programme for the middle-small type diversion power station is that the water head is about 70 meters, the discharge is 9m3/sec. , the installment capacity is 1500 kilowatts, so it is enough for every kilowatt to invest 1200 yuan. In a word, the exploitation of middle-higher-head canal power are very suitable.
出处
《贵州地质》
1990年第1期47-53,共7页
Guizhou Geology
