硐室围岩
The substitution of variable crown elevation tailrace tunnel for surge chamber not only can guarantee the safe operation of the powerplant and reduce the investment but also can avoid unfavorable influence of intensively distributed large span underground chambers on the stability of the surrounding rock mass.
用变顶高尾水洞取代调压室,既可保证电站的安全运行和减小工程投资,又避免了大跨度洞室群分布密集给围岩稳定带来的不利影响。
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