【Key words】 shield tunnel； stratum displacement； earth pressure； numerical modal； grouting； mechanical property；
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The numerical modal analyses of the empty and full loaded open boxcar are carried out in the ANASYS software.
应用an - SYS对运煤敞车空车和重车进行计算模态分析。
Both the modal dispersion characteristics and cut off conditions are investigated through numerical and analytical approach.
我们利用数值和解析的手段对模式色散和截止特性作了细致的研究。
The numerical results show that the modal birefringence of near_rectangle core PCF is at least one order of magnitude higher than the conventional elliptical polarization_maintaining fibers (PMFs).
研究表明：类矩形芯光子晶体光纤的模式双折射比普通椭圆保偏光纤至少高一个数量级。
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