Extensive data of undrained shear strength for various remolded soils are compiled to normalize the remolded undrained strength. Remolded soils have a wide spectrum of liquid limits ranging from 25% to 412%. It is fou...Extensive data of undrained shear strength for various remolded soils are compiled to normalize the remolded undrained strength. Remolded soils have a wide spectrum of liquid limits ranging from 25% to 412%. It is found that the remolded undrained strength is a function of water content and liquid limit. Furthermore, a simple index designated as normalized water content w * is introduced for normalizing remolded undrained strength for various soils. The normalized water content w * is the ratio of water content to liquid limit. The relationship between the remolded undrained strength and the normalized water content can be expressed by a simple equation. The new simple equation is not only valuable theoretically for helping in assessing the in situ mechanical behavior, but also useful to ocean engineering practice.展开更多
对宝鸡地区野外滑坡灾害调查的结果显示,古土壤与黄土交界面对黄土滑坡滑带具有明显的边界效应。为了研究剪切过程中古土壤的力学特性,开展了饱和原状古土壤偏压固结不排水剪(ACU)和常剪应力排水剪(CQD)试验。ACU试验表明:古土壤应力应...对宝鸡地区野外滑坡灾害调查的结果显示,古土壤与黄土交界面对黄土滑坡滑带具有明显的边界效应。为了研究剪切过程中古土壤的力学特性,开展了饱和原状古土壤偏压固结不排水剪(ACU)和常剪应力排水剪(CQD)试验。ACU试验表明:古土壤应力应变曲线在峰后表现为理想塑性特征,较低围压(100 k Pa)条件下发生剪胀破坏,围压≥200 k Pa时发生剪缩破坏。CQD试验结果表明:古土壤在排水条件下发生剪缩破坏,破坏时轴向应变很小,且破坏速率随固结应力增大而减小。根据试验结果得到了q-p’平面内古土壤临界状态线(CSL),求得φ’为28.8°。同时,结合已有研究成果对黄土和古土壤交界面在涉水过程出现局部破坏进行了机理探讨,这些局部破坏控制了潜在滑动面的边界。展开更多
基金ThisresearchprojectwasfinanciallysupportedbytheMinistryofScienceandTechnology Japan (DomesticResearchFellowship 1999 2 0 0 1) .
文摘Extensive data of undrained shear strength for various remolded soils are compiled to normalize the remolded undrained strength. Remolded soils have a wide spectrum of liquid limits ranging from 25% to 412%. It is found that the remolded undrained strength is a function of water content and liquid limit. Furthermore, a simple index designated as normalized water content w * is introduced for normalizing remolded undrained strength for various soils. The normalized water content w * is the ratio of water content to liquid limit. The relationship between the remolded undrained strength and the normalized water content can be expressed by a simple equation. The new simple equation is not only valuable theoretically for helping in assessing the in situ mechanical behavior, but also useful to ocean engineering practice.
文摘对宝鸡地区野外滑坡灾害调查的结果显示,古土壤与黄土交界面对黄土滑坡滑带具有明显的边界效应。为了研究剪切过程中古土壤的力学特性,开展了饱和原状古土壤偏压固结不排水剪(ACU)和常剪应力排水剪(CQD)试验。ACU试验表明:古土壤应力应变曲线在峰后表现为理想塑性特征,较低围压(100 k Pa)条件下发生剪胀破坏,围压≥200 k Pa时发生剪缩破坏。CQD试验结果表明:古土壤在排水条件下发生剪缩破坏,破坏时轴向应变很小,且破坏速率随固结应力增大而减小。根据试验结果得到了q-p’平面内古土壤临界状态线(CSL),求得φ’为28.8°。同时,结合已有研究成果对黄土和古土壤交界面在涉水过程出现局部破坏进行了机理探讨,这些局部破坏控制了潜在滑动面的边界。
