本文選題：云南紅土 + 干濕循環(huán)　； 參考：《水土保持學報》2017年02期

【摘要】：以干濕循環(huán)為控制條件,考慮初始干密度、增濕次數(shù)和脫濕次數(shù)等影響因素,采用室內(nèi)試驗和圖像處理相結(jié)合的方法,研究云南紅土裂縫的產(chǎn)生及其發(fā)展演化。控制初始干密度為1.20,1.30,1.40,1.50g/cm~3,通過增濕、脫濕的干濕循環(huán)及膨脹率等試驗方法,觀察紅土樣裂縫的變化,并應(yīng)用Matlab圖像處理技術(shù)提取紅土樣的裂縫特征參數(shù)。結(jié)果表明:干濕循環(huán)作用下,初始干密度越大,紅土樣越容易開裂,干密度較小時(1.20g/cm~3)土樣始終不開裂,隨干密度增大(1.30,1.40g/cm~3),紅土樣在第3次增濕中開裂,干密度達1.50g/cm~3時,紅土樣在第2次增濕中開裂,增濕過程對紅土樣裂縫發(fā)展的影響顯著大于脫濕過程的影響;紅土樣的膨脹率隨浸泡時間延長逐漸增大,干密度為1.20,1.30,1.40g/cm~3時約8min膨脹基本穩(wěn)定,干密度為1.50g/cm~3時約36min膨脹趨于穩(wěn)定;對應(yīng)紅土樣的裂縫條數(shù)、長度、面積和寬度等特征參數(shù)隨增濕次數(shù)、脫濕次數(shù)增大而增大;隨干密度增大,紅土樣的裂縫條數(shù)、長度與面積增大,裂縫寬度在干密度約1.30g/cm~3處存在峰值。干濕循環(huán)作用引起云南紅土開裂的關(guān)鍵因素在于增濕過程中紅土樣的不均勻膨脹,紅土裂縫屬于膨脹裂縫,其發(fā)展過程包括裂縫孕育期(0~2次)、裂縫形成發(fā)展期(2~6次)和裂縫穩(wěn)定期(6~8次)3個階段,這3個階段綜合作用的結(jié)果,最終影響了紅土裂縫的發(fā)展演化趨勢。
[Abstract]:Taking the dry and wet cycle as the control condition and considering the influence factors such as initial dry density, times of humidification and times of dehumidification, the generation and evolution of the cracks in Yunnan laterite were studied by the combination of laboratory test and image processing. The initial dry density is 1.20 ~ 1.30 ~ 1.40 ~ 1.50 g / cm ~ (-3). By means of humidification, dehumidification, dry-wet cycle and expansion rate, the changes of cracks in laterite samples are observed, and the fracture characteristic parameters of red soil samples are extracted by Matlab image processing technique. The results show that the higher the initial dry density is, the easier it is for the red soil sample to crack, and the dry density of 1.20 g / cm ~ (3) soil sample does not crack. With the increase of dry density of 1.30 ~ 1.40 g / cm ~ (-3), the red soil sample is cracked in the third humidification, the dry density is 1.50 g / cm ~ 3, the dry density is 1.50 g / cm ~ 3, and the dry density is 1.50 g / cm ~ 3, and the dry density is 1.50 g / cm ~ 3. The effect of humidification process on the crack development of red soil sample is obviously greater than that of dehumidification process, and the expansion rate of red soil sample increases gradually with the prolongation of soaking time, and the dry density of 1.20g / cm ~ 3 1.30g / cm ~ 3 is basically stable, and the swelling rate of red soil sample increases gradually with the extension of soaking time, and the dry density of red soil sample is about 1.30g / cm ~ 3. The dry density is 1.50g / cm ~ 3 about 36min expansion tends to be stable, the characteristic parameters such as the number of cracks, length, area and width of the red soil sample increase with the times of humidification, and the number of cracks in the laterite sample increases with the increase of dry density. With the increase of length and area, the crack width has a peak value at the dry density about 1.30g/cm~3. The key factor of the cracking of Yunnan laterite caused by dry and wet circulation is the uneven expansion of the red soil sample in the process of humidification, and the fracture of the red soil belongs to the expansion fracture. The development process includes three stages: the incubation period of fractures is twice, the formation and development of fractures is 6 times), and the stable period of fractures is 6 times). The result of the comprehensive action of these three stages has finally affected the development and evolution trend of the fractures in laterite.
【作者單位】： 昆明理工大學電力工程學院;
【基金】：國家自然科學基金項目(51568031)
【分類號】：TU43

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