自強水電站尾水隧洞塌方處理技術措施
自強水電站尾水隧洞塌方處理技術措施
摘要 自強水電站地下廠房尾水隧洞開挖斷面尺寸5.6m×5.3m（寬×高），巖性為P2c+d厚層灰?guī)r、T1y3泥巖和泥灰?guī)r。施工過程中出現(xiàn)5次大的塌方，其中尾主0＋115.3至尾主0＋130.0樁號段在開挖及一期支護完成后，在進行底板清理，準備鋼筋混凝土永久襯砌的過程中出現(xiàn)大規(guī)模的失穩(wěn)破壞，長度約15m，塌方量約2950m3，頂部塌空高度約32m。為此特制定了洞身塌方處理措施，先固結(jié)塌方體，后開挖的總體方案，并采用了灌漿固結(jié)塌方體、噴錨支護、鋼拱架、回填灌漿等技術措施，成功地處理了塌方，保證了施工進度，可為以后類似工程塌方治理提供借鑒。
關鍵詞尾水洞，塌方處理 ， 回填灌漿 ， 施工技術
Abstract：Self-renewal hydropower station tail water underground powerhouse tunnel excavation section size 5.6 m x 5.3 m (wide × high), lithology for P2c + d thick limestone, T1y3 mudstone limestone and clay. Have appeared during the construction of large landslides five times, of which the Lord 0 + 115.3 to end the Lord 0 + 130.0 HaoDuan pile in the excavation and supporting a period, after the completion of the floor clean up, ready to reinforced concrete lining of permanent appear in the process of the large-scale instability and failure, the length is about 15 m, about 2950 m3 of landslides, top height about 32 m collapse empty. Especially for this formulated the hole collapse and treatment, the first TaFangTi consolidation, after the overall scheme of the excavation, and used the grouting consolidation TaFangTi, spray anchor bracing, steel arch bridge, backfill grouting technology measures, successfully dealing with the landslide, guarantee the construction progress, but for similar project management after collapse for reference.
Key words of the tailrace tunnel, landslide treatment, backfill grouting, construction technology
中圖分類號：TU74文獻標識碼：A 文章編號：
1. 工程概況
自強水電站樞紐工程位于貴州省貴陽市與畢節(jié)地區(qū)織金縣交界凹河處。電站樞紐工程由攔河壩、引水系統(tǒng)、地下廠房等建筑物組成。攔河壩為重力壩，引水發(fā)電系統(tǒng)布置在右岸，由塔式進水口、有壓隧洞、壓力鋼管等建筑物組成，地下廠房位于東風電站庫尾凹河左岸。電站裝機3臺，總裝機容量18MW，引用流量10.26m3/s，額定水頭207m。
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