大型地下洞室位移量級預測方法研究報告

鄧建輝 魏進兵 陳菲 高春玉

摘 要：位移是巖體最容易測量與控制的參數(shù)，其量級與速率是隧道工程圍巖穩(wěn)定評判或位移監(jiān)控的基本參數(shù)。但對于大型地下洞室而言，目前尚未建立相應的標準。以我國西南地區(qū)已建或開挖完畢的6個水電站大型地下廠房的位移監(jiān)測成果為基礎，總結影響地下廠房圍巖位移量級的因素，提煉出主要影響因素，即圍巖初始地應力水平和巖體性狀，分別用最大主應力與巖塊飽和單軸抗壓強度表征。引入圍巖應力強度比代表2個主要因素，建立其與邊墻最大和平均位移量級的2個經(jīng)驗關系式，取得了較好的研究結果，該成果可為地下洞室位移監(jiān)測設計、預警與監(jiān)控標準的建立提供參考。

關鍵詞：大型地下洞室 位移量級 位移預警 監(jiān)控標準

Abstract：For rock masses，displacement is a parameter that can be easily measured and controlled，and its magnitude and rate is the basic parameter for evaluating the stability of rock masses or for displacement control in tunnels.However，such a standard is still not established for large underground caverns.Based on the measured displacements of 6 large-scale underground powerhouse caverns in Southwest China，factors that affect the displacement development in rock masses are summarized and major factors，i.e.in-situ stress and rock mass quality are refined，which are then represented by the maximum in-situ stress and the saturated unconfined compressive strength.The ratio of stress to strength is then introduced to describe the above two factors and two empirical relations are established by regression method to describe its relation with the maximum and average displacements of the cavern sidewalls.The empirical relations give a good fitting result and can be used as reference for the monitoring design and precaution of displacement，and for the establishment of displacement control standard in large underground caverns.

Key Words：Large underground cavern；Displacement magnitude；Displacement precaution；Control standard

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