二次壓縮指數與壓縮指數比值和土壤基本性質相關性之研究

A study on relationship between secondary compression index and compression index ratio and general properties of soils

劉懿萱(Yi-Hsuan Liu)

指導教授 ： 馮道偉

中原大學/工學院/土木工程研究所/碩士(2015年)

https://doi.org/10.6840/CYCU.2015.00150

摘要

不同種類土壤受到載重所產生的壓縮與二次壓縮值皆不同，若是能了解影響土壤壓縮與二次壓縮之因素，既有助於估算土壤之沉陷量，亦有助於進行土壤壓密行為之研究及發展。Mesri and Castro (1987)提出二次壓縮指數與壓縮指數比值 為常數的觀念，可用於定義任何土壤二次壓縮的行為。
文獻中顯示許多土壤之 值為常數，然而現今尚不清楚是土壤之何種因素在影響著 值的大小，本研究利用基本物理性質試驗、單向度壓密試驗及X光繞射試驗，分別對高嶺土、紅土、石門淤泥和石牌黏土土樣進行分析。期望能由土壤之基本物理性質和土壤內所含的礦物來探討 的影響因素。
根據試驗分析結果，二次壓縮指數與綠泥石、伊利石和雲母之累積含量相關，壓縮指數與土壤之液性限度、初始孔隙比及伊利石和高嶺石礦物之累積含量相關。綠泥石、伊利石和雲母含量高且高塑性之土壤(高嶺土)，其二次壓縮指數高，且壓縮指數很高，所以 較低；綠泥石、伊利石和雲母含量低且低塑性之土壤(紅土)，其二次壓縮指數很低，且壓縮指數低，所以 較低；綠泥石、伊利石和雲母含量高且低塑性之土壤(石門淤泥)，其二次壓縮指數高，且壓縮指數很低，所以 較高；綠泥石、伊利石和雲母含量高且低塑性之土壤(石牌黏土)，其二次壓縮指數值很高，且壓縮指數值低，所以 較高。

關鍵字

黏土 ； 壓縮指數 ； 二次壓縮指數 ； 礦物

並列摘要

When a different type of soil receives loading, the induced compression and secondary compression are different. If the factors affecting both soil compression and secondary compression were understood, it would be useful for both estimating ground settlement and studying soil consolidation behavior. Mesri and Castro (1987) propose the concept of constant which completely defines the secondary compression behavior of any one soil.
Documents show a constant value for each soil, but it is not clear yet as to what kind of factors would affect the value. In this study, basic physical tests, IL oedometer test and X-Ray Diffractrometry test were used on kaolin, red soil, shimen mud, and shipi clay samples. It is expected to understand the impact of the basic physical properties and mineral contents on both compression index and secondary compression index, so as to investigate their effect on the value of .
According to the test results, secondary compression index is related to the accumulated chlorite, illite, and mica contents of the soil, whereas compression index is related to initial void ratio, liquid limit and the accumulated illite and kaolinite contents of the soil. Kaolin sample contains high levels of chlorite, illite and mica mineral with high plasticity so that its secondary compression index is high and compression index is very high, thus resulting in a lower value. Red soil sample contains low levels of chlorite, illite, and mica with low plasticity so that its secondary compression index is very low and compression index is low, thus resulting in a lower value. Shimen mud sample contains high levels of chlorite, illite, and mica with low plasticity so that its secondary compression index is high and compression index is very low, thus resulting in a higher value. Shipi clay sample contains high levels of chlorite, illite, and mica with low plasticity so that its secondary compression index is very high and compression index is low, thus resulting in a higher value.

並列關鍵字

mineral ； secondary compression ； compression index ； clay

參考文獻

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