One early plan was to install hundreds of micropiles (small diameter drilled piles) through the existing foundation down to bedrock.
一项早期计划是在现有基础上安装数百个微型桩（小直径钻孔桩）直至基岩。
Micropile
原声例句
工程学速成课
英语百科
Deep foundation
（重定向自Micropile）
A deep foundation is a type of foundation which transfers building loads to the earth farther down from the surface than a shallow foundation does, to a subsurface layer or a range of depths.
A pile is a vertical structural element of a deep foundation, driven deep into the ground at the building site.
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