公开(公告)号：US5063785A

公开(公告)日：1991-11-12

申请号：US564056

申请日：1990-08-07

申请人： Joseph F. Labuz ,  Ioannis G. Vardoulakis ,  Andrew Drescher

发明人： Joseph F. Labuz ,  Ioannis G. Vardoulakis ,  Andrew Drescher

IPC分类号： G01N3/00 ,  G01N3/02 ,  G01N3/10

CPC分类号： G01N3/10 ,  G01N2203/0025 ,  G01N2203/0254

摘要： A plane-strain apparatus is provided for testing soft rock and concrete specimens for failure under compression load in a direction generally along a central axis of the specimen. The specimen has first and second end surfaces, and four side surfaces, which form a generally rectangular prism cross-section configuration. The apparatus includes a bottom support plate supporting the first end surface, and a top plate for loading the second end surface. A frame surrounds the specimen and supports a pair of diametrically opposite base wedge plates aligned with two opposite side surfaces of the specimen. The frame is spaced from the specimen and the base wedges and mating adjustable wedge plates which engage the opposite surfaces of the specimen facing the base wedge plates. The cylindrical frame, and the base wedges and mating adjustment wedge plates restrain movement of the opposite side surfaces of the specimen to be tested in first lateral directions perpendicular to the axis of loading. The specimen is substantially unrestrained from shifting in directions parallel to the adjustable wedge plates. A mechanism for loading the specimen is provided at the second end surface. The applied load is directed by the top plate toward the support plate until the specimen fails in shear and at least two portions of such specimen shifts in a direction parallel to the side plates. Low friction linear slide mechanism is provided for mounting the top plate for movement along a linear support substantially parallel to the plates of the wedges.

摘要翻译： 提供了一种平面应变装置，用于在通常沿试样的中心轴线方向的压缩载荷下测试软岩和混凝土试样的破坏。 样本具有第一和第二端面以及四个侧表面，其形成大致矩形的棱镜横截面构造。 该装置包括支撑第一端面的底部支撑板和用于装载第二端面的顶板。 框架围绕试样并且支撑与样品的两个相对侧表面对准的一对径向相对的基部楔形板。 框架与试样间隔开，基部楔块和配合的可调节的楔形板，其与试样的面向基座楔形板的相对表面接合。 圆柱形框架和底座楔形件和配合调节楔形板限制待测试样品的相对侧表面在垂直于装载轴的第一横向方向上的运动。 样本基本上不受平行于可调节楔形板的方向的移动的限制。 在第二端面处设置用于装载试样的机构。 施加的载荷由顶板朝向支撑板引导，直到试样在剪切下失效，并且这样的试样的至少两个部分在平行于侧板的方向上移动。 提供了低摩擦线性滑动机构，用于安装顶板以沿着基本上平行于楔形板的线性支撑件移动。

公开(公告)号：US4825700A

公开(公告)日：1989-05-02

申请号：US207148

申请日：1988-06-15

申请人： Ioannis G. Vardoulakis ,  Andrzej Drescher

发明人： Ioannis G. Vardoulakis ,  Andrzej Drescher

IPC分类号： G01N1/28 ,  G01N3/00 ,  G01N3/02 ,  G01N3/08 ,  G01N3/24 ,  G01N33/24 ,  G01N33/38 ,  G01N33/42

CPC分类号： G01N3/24 ,  G01N3/08 ,  G01N2203/0085 ,  G01N2203/0254 ,  G01N2203/0268 ,  G01N2203/0284 ,  G01N33/24 ,  G01N33/38 ,  G01N33/42

摘要： A bi-axial compression test apparatus for geomaterial (soil, etc.) samples that is designed to allow free shear band formation and provide measurements of the stress displacement characteristics of the failure zone. A geomaterial sample formed into a specimen comprising a right rectangular prism is surrounded by a thin rubber membrane and is supported by walls along two parallel faces. An axial load is kinematically applied by a plate that is guided to prevent any tilt or eccentricity, while a bottom support plate for the specimen is horizontally guided by a linear bearing that is substantially friction free. All of the surfaces in contact with the specimen are glass lined and lubricated to minimize friction. The assembly of the specimen and its supports is placed in a conventional tri-axial cell in a loading frame so that an axial load can be applied to one end of the specimen and reacted against the bottom plate. Internal loaded load cells allow for accurate measurement of the axial force, and any eccentricities thereof, as well as friction along the side walls. Displacement transducers monitor the axial and lateral displacements of the specimen and the horizontal movement of the bottom plate, to permit analysis of the shear mode, and when to determine shear failure occurs.

摘要翻译： 用于地质材料（土壤等）样品的双向压缩试验装置，其被设计成允许自由剪切带形成并且提供破坏带的应力位移特性的测量。 形成为包括右矩形棱镜的样品的地质材料样品被薄橡胶膜包围，并且沿着两个平行的面被壁支撑。 通过被引导以防止任何倾斜或偏心的板运动地施加轴向载荷，而用于试样的底部支撑板由基本上无摩擦力的直线轴承水平引导。 与样品接触的所有表面均为玻璃衬里并进行润滑以最小化摩擦。 将样品及其支撑体的组件放置在装载框架中的常规三轴电池中，使得可以将轴向载荷施加到样品的一端并与底板反应。 内部负载传感器允许精确测量轴向力及其任何偏心率，以及沿着侧壁的摩擦力。 位移传感器监测样品的轴向和横向位移以及底板的水平运动，以便分析剪切模式，以及何时确定剪切破坏发生。