本文選題：凍脹率 + 含水率　； 參考：《內(nèi)蒙古農(nóng)業(yè)大學》2015年碩士論文

【摘要】：由于內(nèi)蒙古砒砂巖區(qū)屬典型的溫帶大陸性氣候,四季分明。在冬春兩季,日間因太陽輻射的照耀而使溫度急劇上升,因此形成“融解”現(xiàn)象,而夜間由于溫度急速下降從而產(chǎn)生“凍結(jié)”現(xiàn)象,在晝夜之間交替出現(xiàn)“融解”和“凍結(jié)”現(xiàn)象,砒砂巖土壤隨之熱縮冷脹,“水”、“冰”相變頻繁,使得土壤結(jié)構(gòu)更加松散,膠結(jié)力變差,加劇砒砂巖的風化過程,地表土層因凍融而發(fā)生結(jié)構(gòu)上的變異,相應地砒砂巖發(fā)生了凍融侵蝕。砒砂巖區(qū)強烈的侵蝕、流失和邊坡穩(wěn)定問題與砒砂巖的季節(jié)凍脹有著密切的關(guān)系,其凍脹作用改變了砒砂巖的內(nèi)部結(jié)構(gòu),直接影響其物理力學性能。為了研究含水率、冷端溫度、干密度與砒砂巖凍脹率的關(guān)系,文中針對內(nèi)蒙古鄂爾多斯市準格爾旗砒砂巖進行不同含水率、不同溫度、不同干密度下多因素耦合凍脹試驗。研究結(jié)果表明：砒砂巖含水率在11%以下時,幾乎不發(fā)生凍脹；含水率為12%-16%時,凍脹率與含水率之間存在著良好的線性關(guān)系,隨含水率增加呈線性增大。確定了砒砂巖在-10℃的起始凍脹含水率,不在砂巖的凍脹率范圍之內(nèi),所以砒砂巖的巖性有待進一步的確定；凍脹率隨干密度的增大而增大,當冷端溫度達到-20℃時,表現(xiàn)異常；凍脹率隨冷端溫度的降低而增大,但干密度為1.85g/cm3的試件,凍脹率隨冷端溫度的降低凍脹率有減小態(tài)勢。含水率、冷端溫度對砒砂巖凍脹率影響顯著,干密度次之。運用spss軟件對試驗數(shù)據(jù)進行多元非線性回歸,確定了含水率、干密度、冷端溫度多因素耦合作用下凍脹率的回歸方程。
[Abstract]:Due to the typical temperate continental climate in the soft sandstone area of Inner Mongolia, the four seasons are distinct. During the winter and spring seasons, the temperature rises sharply during the day due to the sun's radiation, thus forming a "melting" phenomenon, while the "freezing" phenomenon occurs during the night due to the rapid drop in temperature. The phenomena of "melting" and "freezing" appear alternately between day and night, and the soil in the soft rock becomes hot, shrinking and expanding, and the "water" and "ice" phase change frequently, which makes the soil structure more loose and the cementation force worse, thus exacerbating the weathering process of the arsenopyst. Due to the structural variation of the surface soil layer due to freezing and thawing, thawing erosion occurred correspondingly in the arsenopyst. The strong erosion loss and slope stability are closely related to the seasonal frost heaving of the soft rock. The frost heaving changes the internal structure of the soft rock and directly affects its physical and mechanical properties. In order to study the relationship between water content, cold end temperature, dry density and frost-heaving rate of arsenitic sandstone, the coupling frost-heaving test was carried out under different moisture content, different temperature and different dry density for arsenopyst rock in Zhungeer Banner, Ordos City, Inner Mongolia. The results show that there is almost no frost heave when the water content is below 11%, and there is a good linear relationship between frost heave and water content when the water content is between 12% and 16%, and increases linearly with the increase of water content. The initial frost-heaving water content of Pisha sandstone at -10 鈩，

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