大型地下洞室位移量级预测方法研究报告

邓建辉 魏进兵 陈菲 高春玉

摘 要：位移是岩体最容易测量与控制的参数，其量级与速率是隧道工程围岩稳定评判或位移监控的基本参数。但对于大型地下洞室而言，目前尚未建立相应的标准。以我国西南地区已建或开挖完毕的6个水电站大型地下厂房的位移监测成果为基础，总结影响地下厂房围岩位移量级的因素，提炼出主要影响因素，即围岩初始地应力水平和岩体性状，分别用最大主应力与岩块饱和单轴抗压强度表征。引入围岩应力强度比代表2个主要因素，建立其与边墙最大和平均位移量级的2个经验关系式，取得了较好的研究结果，该成果可为地下洞室位移监测设计、预警与监控标准的建立提供参考。

关键词：大型地下洞室 位移量级 位移预警 监控标准

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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