空心圆柱扭剪试验中广义应力路径的控制与实现

发布时间：2018-06-13 02:18

本文选题：广义应力路径 + 试验研究　；参考：《岩土工程学报》2017年S1期

【摘要】：针对国内外动态空心圆柱扭剪仪(HCA)在设置广义应力路径时大都需要人为假设外荷载加载形式的现状,指出了这种假定对HCA仪模拟广义应力路径能力的局限。考虑到GCTS公司HCA-100能够独立地控制轴力、扭矩及内外围压独立地加载,通过缜密的数学推导,提出了由目标广义应力路径直接确定外荷载加载方式的计算公式,据此可以实现对任意形式的广义应力路径的模拟并通过试验验证了其可行性。在三维应力坐标系b-?-?中,探讨了典型广义应力路径的表示方法,以q恒定的主应力轴连续旋转的应力路径为例,讨论了内、外围压与广义应力路径之间的关系。简化并完善了HCA仪的控制过程,为后续试验研究提供了理论依据。
[Abstract]:In view of the fact that most of HCA (dynamic hollow cylindrical torsional shear apparatus) at home and abroad need to assume the loading form of external load when setting up generalized stress path, the limitation of this assumption to the ability of HCA instrument to simulate generalized stress path is pointed out. Considering that the HCA-100 of GCTS company can independently control axial force, torque and internal and external confining pressure, a calculation formula for determining the loading mode of external load directly from the generalized stress path of the target is put forward by careful mathematical derivation. Based on this, the generalized stress path of any form can be simulated and its feasibility is verified by experiments. In the three-dimensional stress coordinate system b-? In this paper, the representation of typical generalized stress paths is discussed. Taking the continuous rotation of Q constant principal stress axis as an example, the relationship between internal and external pressures and generalized stress paths is discussed. The control process of HCA instrument is simplified and perfected, which provides a theoretical basis for further experimental research.
【作者单位】：后勤工程学院岩土力学与地质环境保护重庆市重点实验室;重庆市地质灾害防治工程技术研究中心;青岛理工大学理学院;重庆交通大学土木建筑学院;
【基金】：国家自然科学基金项目(11572165)
【分类号】：TU43

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