本文關(guān)鍵詞：重塑紅黏土固結(jié)變形影響因素分析　出處：《公路》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 重塑紅黏土 固結(jié)變形 壓縮系數(shù) 干濕循環(huán)

【摘要】：基于一維室內(nèi)固結(jié)試驗,分析了初始狀態(tài)和干濕循環(huán)狀態(tài)下紅黏土固結(jié)變形特性,并對固結(jié)試驗過程中的保濕方法進行了改進。研究結(jié)果表明,壓縮試驗的保濕方法建議采用預(yù)先補水+濕毛巾覆蓋的措施,需要補充水分的多少根據(jù)散失的水量來定。當含水率介于最佳含水率-2%~最佳含水率之間,孔隙比、壓縮變形系數(shù)、壓縮系數(shù)變化幅度不大。當含水率大于最佳含水率后,孔隙比、壓縮變形系數(shù)、壓縮系數(shù)隨含水率的增加變化幅度較大。從控制路基工后沉降的角度考慮,建議路基壓實時的含水率介于最佳含水率-2%~最佳含水率之間。壓實紅黏土應(yīng)力~應(yīng)變關(guān)系可用ε/p=Kp~n式來表達。干濕循環(huán)后紅黏土壓縮系數(shù)明顯比初始狀態(tài)的壓縮系數(shù)要大,且隨著循環(huán)次數(shù)的增加,壓縮系數(shù)增大,前3次循環(huán)壓縮系數(shù)增加較大,第4次和第5次循環(huán)壓縮系數(shù)趨于穩(wěn)定。建議在路基沉降計算中采用長期壓縮系數(shù)a_(1-2)指標(即第4次或第5次循環(huán)的壓縮系數(shù)),使得計算結(jié)果更加符合實際情況。
[Abstract]:Based on one-dimensional laboratory consolidation tests, the consolidation deformation characteristics of red clay under initial state and dry wet cycle state are analyzed, and the moisturizing method during consolidation test is improved. The moisturizing method of compression test suggests that the measure of pre-hydrating wet towel covering should be adopted, and the amount of water supply should be determined according to the amount of lost water. When the moisture content is between the optimum moisture content and the optimum moisture content, the moisture content is between the optimum moisture content and the optimum moisture content. The void ratio, compression deformation coefficient and compression deformation coefficient change little. When the water content is larger than the optimum water content, the void ratio and the compression deformation coefficient. The compression coefficient varies greatly with the increase of moisture content. From the point of view of controlling the settlement of roadbed after construction. It is suggested that the moisture content of embankment is between the optimum moisture content of -2 and the optimum moisture content. The stress-strain relationship of compacted red clay can be expressed by 蔚 / ppKpPNs formula. The compression coefficient of red clay is clear after dry and wet cycle. The explicit compression coefficient is larger than the initial state. With the increase of cycle times, the compression coefficient increases, and the first three cycles increase greatly. The compression coefficients of the 4th and 5th cycles tend to be stable. It is suggested that the long-term compression coefficients a / 1 / 2 (i.e. the compression coefficients of the 4th or 5th cycles) should be used in the calculation of subgrade settlement. The calculation results are more in line with the actual situation.
【作者單位】： 貴州大學土木工程學院;
【基金】：國家自然科學基金項目,項目編號51368010,51668011 貴州省科技支撐計劃項目,黔科合支撐[2016]2005 貴州科技廳-貴州大學聯(lián)合資金項目,黔科合LH字[2014]7663
【分類號】：U416.16
【正文快照】： 紅黏土主要分布于我國南方地區(qū),由于紅黏土表1　紅黏土基本物理指標具有高液限、高塑性和高含水率等特點,紅黏土路基按公路土工0.075~產(chǎn)生一些病害[1],究其原因在干旱季節(jié)紅黏土失水0.075mm/%0.002mm/%試驗規(guī)程(JTG0.002mm/%收縮,雨季又吸水飽和膨脹,這樣往復(fù)的作用將導(dǎo)致E4，

本文編號：1405289