在铁路路堤中，如何将层压实度设计为下层≥90%，上层≥95% ?-地江南体育网页版球科学堆栈交换江南电子竞技平台 最近30个来自www.hoelymoley.com 2023 - 04 - 15 - t21:08:03z //www.hoelymoley.com/feeds/question/23876 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/23876 1 在铁路路堤中，如何将层压实度设计为下层≥90%，上层≥95% ? ecoli404 //www.hoelymoley.com/users/26947 2022 - 06 - 02 - t23:10:08z 2022 - 06 - 02 - t23:10:08z

我目前在特伦玛雅项目México作为规划部门的一部分;不管怎样，我读了一个硕士学位，看着执行项目，有一些参数，我在文献中看了很多，我发现自己无法找到它们的原因，我只是好奇。< / p >

My question is simple, in the design of the railway embankment, lets say we have a 7 meters height embankment over a natural soil that meets the loading capacity, so it is divided in layers of 0.3 meters such that the bottom n layers must meet a 90% compaction degree, and the last 5 upper layers must meet a ≥ 97% compaction degree. Searching I found out in "Geotechnical Parameters of Soil, Considering the Effect of Additional Compaction of Embankment" that the reason why is that upper layer compaction actions indirectly compact lower ones, and this effect must be considered in the design.

Yet, generally this compaction degree seem to default to be greater than 90% for lower layers and greater than 97% or 100% for upper layers. A prove of this:

Capture from Technical memorandum of the California H-S Train Project

Why 90%? Why not 91% of compaction degree? Or 92%? or 100%? I know compacting all layers 100% degrees would be pretty high in costs, but then why 90%?
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