拉西瓦水電站地下廠房頂拱開挖及支護(hù)情況綜述-免費閱讀
【正文】 （4）對于高地應(yīng)力區(qū)的廠房頂拱，由于巖石不斷卸荷，為有效防止施工及運行期掉塊，廠房頂拱表層噴護(hù)宜采用網(wǎng)噴混凝土，以利安全。綜合上述修改，廠房頂拱支護(hù)實際完成量見表2。4 地下廠房頂拱開挖廠房頂拱開挖跨度30m，（樁號廠左0+～廠右0+）開挖高度10m，采用三區(qū)分塊開挖方案，見圖3。根據(jù)上述公式計算，9層開挖方案的彈性釋放能總量最小，5層開挖方案的彈性釋放能總量最大，即隨開挖高度的減少（或?qū)訑?shù)的增加），彈性釋放能總量隨之減少，見圖1。受HfHf1及HL1等斷裂組合影響，頂拱較大范圍內(nèi)有不穩(wěn)定結(jié)構(gòu)巖體。為確保施工期、運行期的安全及開挖質(zhì)量，經(jīng)對圍巖彈性釋放能和能量釋放率的計算分析，綜合考慮其它因素，合理確定了地下廠房的開挖分層，并對廠房頂拱采取有效的開挖方法及支護(hù)措施。 Laxiwa Hydropower StationAbstract:The underground powerhouse excavation group of Laxiwa Hydropower Station is buried in high geostress area where the highest principal stress reaches from 20MPa to order to make sure the security during the construction and function period and sure excavation quality, based on results of pution and analysis to elastic release energy and energy liberation rate of surrounding rock mass and overall consideration of various factors,reasonable delamination excavations is carried out , and effective measures of excavation and support to surrounding rock mass of arch crown are observation shows that deformation of surrounding rock mass has tended to be constan
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