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How to determine reasonable subsea tunnel rock cover thickness is still an intractable research subject.
合理确定隧道顶板厚度是一项重要的研究课题。
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The thickness of sedimentary cover is rather huge;
沉积盖层厚度大、地块表层强度低；
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The thickness of sedimentary cover is rather huge;
沉积盖层厚度大、地块表层强度低；
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