本文關鍵詞： 土力學 循環(huán)單剪 初始剪應力 剪切方向角 軟化指數　出處：《巖石力學與工程學報》2016年05期 　論文類型：期刊論文

【摘要】：邊坡、擋土墻等結構中的土體一般存在初始剪應力的作用,同時在地震、波浪等動荷載作用下,土體的初始剪應力與動荷載之間往往會存在一定的夾角。為了研究初始剪應力與循環(huán)荷載之間的夾角(剪切方向角)對土體軟化指數的影響,采用多向循環(huán)單剪儀對溫州軟黏土進行一系列的循環(huán)單剪試驗研究。研究結果表明,在特定剪切方向角下,隨著循環(huán)應力比rc的增加,軟化指數?逐漸降低,且在相同軟化指數條件下,相鄰循環(huán)應力比對應的循環(huán)圈數相差的幅度逐漸減小;循環(huán)應力比一定時,當剪切方向角在0°~90°范圍內增加時,軟化指數依次遞增,當90°θ≤180°時,軟化指數的變化趨勢與0°~90°時相反;循環(huán)應力比rc=0.15時,在加載初期,θ=120°,150°,180°時,軟化指數均分別較θ=60°,30°,0°時大。對試驗數據進行回歸分析,建立土體的軟化指數模型和孔壓 軟化模型。
[Abstract]:The soil mass in slope, retaining wall and other structures generally has the function of initial shear stress, at the same time, under the action of earthquake, wave and other dynamic loads, In order to study the influence of the angle between initial shear stress and cyclic load (shear direction angle) on the softening index of soil, there is always a certain angle between initial shear stress and dynamic load. A series of cyclic single shear tests on Wenzhou soft clay were carried out by using a multidirectional cyclic single shear apparatus. The results show that the softening exponent increases with the increase of cyclic stress ratio (RC) at a specific shear direction. Under the condition of the same softening index, the amplitude of cycle cycle number difference between adjacent cyclic stress ratio decreases gradually, and when the cyclic stress ratio is fixed, when the shear direction angle increases in the range of 0 擄to 90 擄, the softening index increases in turn. When 90 擄胃 鈮，

本文編號：1549290