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介绍了一个混凝土衬砌厚 30cm、内径 6 .6m硬岩隧洞的施工实例 ,对采用隧洞掘进机 (TBM)与常规钻爆法的直接费用、直接和间接利润作了广泛分析和比较。费用分析表明 ,采用TBM开挖 ,如果开挖长度超过 15km ,仅节省的超挖费用 /混凝土衬砌费用一项 ,就可用来支付掘进机开挖 6～ 8km隧洞的费用。TBM的掘进速度是常规钻爆法的 10～ 15倍。时间要素评估表明 ,在印度水电工程中 ,缩短电力联网时间可带来巨大的间接利润。研究还指出TBM的一些其他特点 ,诸如自动化操作、清洁的空气环境、噪音低、分级的石渣以及安全性高。归纳指出 ,采用TBM开挖的可计利润和不可计利润是巨大的 ,因而印度水电工程中有必要采用TBM来进行施工。
A construction example of a concrete lining with a thickness of 30cm and an inner diameter of 6.6m is introduced. The direct costs, direct and indirect profits of the tunnel boring machine (TBM) and conventional drilling and blasting methods are widely analyzed and compared. Cost analysis shows that with TBM excavation, if the excavation length exceeds 15km, only the overburden cost / concrete lining cost saved can be used to pay for tunnel excavation of tunnels of 6 ~ 8km. TBM tunneling speed is 10 to 15 times the conventional method of drilling and blasting. The evaluation of the time elements shows that in India hydropower projects, there can be enormous indirect profits resulting from the shortening of the power interconnection time. The study also pointed out some of the other features of TBM, such as automated operation, clean air environment, low noise, graded gravel, and high safety. Indiscriminately pointed out that the use of TBM excavation of accrued profits and not countable profits is huge, so it is necessary to use TBM in India hydropower project construction.