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首页> 外文期刊>Australian Geomechanics >A NEW RING SHEAR APPARATUS FOR DETERMINATION OF THE RESIDUAL SHEAR RESISTANCE OF REMOULDED BROWN COAL
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A NEW RING SHEAR APPARATUS FOR DETERMINATION OF THE RESIDUAL SHEAR RESISTANCE OF REMOULDED BROWN COAL

机译：测定残余褐煤剩余抗剪强度的新型环剪装置

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摘要

Victorian brown coal is a typical intermediate geomaterial, whose behaviour falls between that of soft rock and engineering clay. The intact material exhibits lower permeability and higher tensile strength compared to over-consolidated clay. Large, shallow open cuts are used to mine the coal in the Latrobe Valley, Victoria, Australia, predominantly as fuel for Victoria's power stations. For batter design the brown coal is treated as clay with high values of cohesion and friction angle. Composite rotational and block sliding is a recognised failure mode for this material and it is apparent from recent observations that failure risk increases with time. During long-term movements of the brown coal behind and below the batters it is anticipated that the material will be crushed and remoulded along sliding surfaces as a result of progressive pre-failure displacements. After periods of decades, the assumption is that for large sections along any incipient failure surface, shear strength will be at or close to the residual shear strength of the material. Thus, it is important to understand whether this assertion is correct and the processes leading to the weakened state. A new ring-shear test apparatus has been designed to determine the variation of shear strength of this material for a range of shear strains under essentially drained conditions. In this paper the design considerations and the resulting form of the test apparatus are presented. The equipment is also applicable to the testing of the interseam clays, silts and fine sands that are also found in the mines.
机译：维多利亚时代的褐煤是典型的中间岩土材料，其行为介于软岩和工程粘土之间。与过度固结的粘土相比，完整的材料表现出较低的渗透性和较高的拉伸强度。大型浅露天矿用于开采澳大利亚维多利亚州拉特罗布河谷的煤炭，主要是为维多利亚州的发电站提供燃料。对于面糊设计，褐煤被视为具有高内聚力和摩擦角的黏土。复合材料旋转和滑块滑动是这种材料公认的失效模式，从最近的观察结果可以明显看出，失效风险随时间增加。在褐煤在击球面下方和下方的长期移动过程中，预计由于逐步的破坏前位移，材料会沿着滑动表面被压碎和重塑。经过数十年的时间，假设是对于沿任何初期破坏面的大截面，剪切强度将等于或接近材料的残余剪切强度。因此，重要的是要了解此断言是否正确以及导致弱化状态的过程。设计了一种新的环剪试验设备，以确定在基本排水条件下，该材料在一定范围内的剪切应变下的剪切强度变化。在本文中，介绍了设计注意事项和测试设备的最终形式。该设备还适用于矿井中发现的中间缝粘土，粉砂和细砂的测试。

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