摘要
洞室支护过早支护量较大,支护过晚则危险性较大,及时支护才能事半功倍.初期支护厚度较小,采用三维数值方法分析初期支护单元较多、耗时较长,与实际受力差异较大.以厄瓜多尔CCS 水电站为例,采用广义Hoek-Brown 判据,引入欧美运用较广、较成熟的PHASEⅡ软件及分析方法,进行支护时机分析及钢拱架喷混凝土支护分析.结果表明：CCS 水电站附属洞室应力释放40% ～50%时为最佳支护时机;混凝土初期支护中型钢承担的荷载比例均小于40%;采用欧美规范进行的洞室初期支护设计能够满足洞室稳定要求.
For tunnel,earlier support needs a larger amount of supports,while later support will be more dangerous. Thus,timely support can be more effective. Due to the small thickness of initial support,using 3D numerical method will lead too much units,a very long time and quite different from the actual situation. Here based on CCS Hydropower Station in Ecuador,using the Generalized Hoek-Brown failure criterion,the paper introduced PHASE Ⅱ software and relate analysis method which were used widely,more mature in western for the analysis of support time and shotcrete with steel sets. The results suggest that the support time is when the stress releases 40%-50% for CCS power station auxiliary tunnels,the steel sets' load percentage is less 40% in shotcrete with steel sets,the tunnel initial supports which based on western related specification can meet the stability requirement.
出处
《人民黄河》
CAS
北大核心
2016年第1期129-133,共5页
Yellow River
