大型地下洞室位移量級(jí)預(yù)測(cè)方法研究報(bào)告

鄧建輝 魏進(jìn)兵 陳菲 高春玉

摘 要：位移是巖體最容易測(cè)量與控制的參數(shù)，其量級(jí)與速率是隧道工程圍巖穩(wěn)定評(píng)判或位移監(jiān)控的基本參數(shù)。但對(duì)于大型地下洞室而言，目前尚未建立相應(yīng)的標(biāo)準(zhǔn)。以我國(guó)西南地區(qū)已建或開挖完畢的6個(gè)水電站大型地下廠房的位移監(jiān)測(cè)成果為基礎(chǔ)，總結(jié)影響地下廠房圍巖位移量級(jí)的因素，提煉出主要影響因素，即圍巖初始地應(yīng)力水平和巖體性狀，分別用最大主應(yīng)力與巖塊飽和單軸抗壓強(qiáng)度表征。引入圍巖應(yīng)力強(qiáng)度比代表2個(gè)主要因素，建立其與邊墻最大和平均位移量級(jí)的2個(gè)經(jīng)驗(yàn)關(guān)系式，取得了較好的研究結(jié)果，該成果可為地下洞室位移監(jiān)測(cè)設(shè)計(jì)、預(yù)警與監(jiān)控標(biāo)準(zhǔn)的建立提供參考。

關(guān)鍵詞：大型地下洞室 位移量級(jí) 位移預(yù)警 監(jiān)控標(biāo)準(zhǔn)

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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