1) sand layer and clay layer
砂层和粘土层
2) silty layer and sandy layer
粘土层和砂土层
3) clayey sand
粘土质砂层
4) saturated clay layer
饱和粘土层
5) saturated fine silty sand ground
饱和粉细砂土层
6) saturated sandy soil stratum
饱和粉质砂土层
1.
The dewatering measure combining surface water technology and light well point dewatering on saturated sandy soil stratum according to the favorable water permeability of the soil stratum can effectively lower the underground water level in the stratum and make up the unthorough dewatering of single dewatering technology.
在饱和粉质砂土层中根据其土层透水性好的特点,利用地表降水工艺及与洞内轻型井点降水相结合的降水措施,能充分降低地层中的地下水位,弥补单一降水工艺降水不彻底的缺陷,防止涌泥涌砂的出现,保证大断面近距双向隧道的安全,实现无水施工。
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