統一土壤分類法中(Unified Soil Classification System, USCS)，將 礫石-砂土-黏土之混合土壤試驗結果加以歸納，並描述在不同混和比例下，混合土壤所具有的基本土壤行為及其特性，但是對土壤之工程性質(如承載力和透水性)之描述不多。就此一問題，Park和Santamarina 於2017年提出修正土壤分類法(Revised Soil Classification System，簡稱RSCS)，依礫石-砂土-細土之混和比例，歸納出混合土壤的承載控制(mechanical control)及透水控制(flow control) 機制。本研究將依修正土壤分類法中之土壤分類圖的土壤承載控制配比，進行加州載重比試驗(California Bearing Ratio，簡稱CBR試驗)，找出混合土壤經夯實泡水後之承載力，並將所得之各配比承載力值，於土壤分類圖上繪出CBR等值線圖。利用此CBR等值線圖可預先研判不同混和比例之土壤，經夯實泡水後之承載力(CBR值)大小，可供一般土夯實工程使用。

Soils which consist of gravel, sand, and fines have been described satisfactorily by the united soil classification system (USCS) so far. Using this USCS, it can disclose the physical properties of soil and classify soils into different categories. However, USCS does not take into account the mechanical and fluid flow aspects of soils. Park and Santamarina (2017) proposed a revised soil classification system (RSCS) for soil mixtures and grouped soils with different gravel-sand-fines mixtures in the texture triangle chart based on the mechanical response or fluid flow of the soils. It also indicates the controlling soil texture of different texture groups. To understand the load carrying capacity (mechanical response) of different texture groups on the triangular chart of RSCS, the California Bearing Ratio (CBR) test was adopted to evaluate the load carrying capacities (after soaking) of soil. After obtaining the CBR values of different soil mixtures, the triangular textural chart of RSCS can be correlated to the CBR values which are used to establish the CBR contours. This triangular texture chart with CBR contours can be a handy tool for engineers to estimate the load carry capacity of different gravel-sand-fines mixtures after soaking.

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