求翻译：由于主副坝段砂砾石覆盖层渗透系数比较大，属于强透水层，基岩属中等透水层。因此，主坝与副坝地基砂砾石层的防渗处理以及基岩防渗帷幕灌浆处理是大坝的主要工程地质问题。是什么意思？

Since the main and auxiliary dam of sand and gravel overburden permeability coefficient is relatively large, are strong permeable layer , bedrock is moderately permeable layer .

In the main, as well as sand, gravel mulch permeability coefficient is relatively large, which is a permeable layer, bedrock medium permeable layer. Therefore, the main dam and the dam Foundation sand gravel layer of impermeable with bedrock, as well as anti-seepage curtain grouting process is dam o

Because the host vice-dam section sandy gravel overburden layer penetration coefficient quite is big, belongs to the strong permeable bed, the bedrock is the medium permeable bed.Therefore, the main dam guards against with the vice-dam ground gravel riddlings infiltrates processing as well as the be

As main and auxiliary dam permeability coefficient larger gravel overburden, which belongs to the strongly permeable layer and middle layer of bedrock. Therefore, the gravel of main dam and auxiliary dam Foundation seepage and anti-seepage curtain Grouting in bedrock is the main engineering geologic

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