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Evaluation of Many Load Tests of Passive Rock Bolts in the Czech Republic

机译：捷克共和国被动岩石螺栓的许多载荷试验评估

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Within the research project a??FR-TI4/329 Research and development - creating an application system for the design and analysis of soil and rock anchors including the development of monitoring elementsa??, an extensive stage of field load tests of rock bolts was carried out. The tests were conducted at 14 locations with varied rock composition. Before the initial tests, a loading stand was designed and constructed. A total of 201 pieces of tensile tests of bolts having lengths from 0.5 up to 2.5 m, a diameter of 22-32 mm, were performed. These were fully threaded rods, self-drilling rods, and fiberglass rods. The bolts were clamped into the cement and resin. The loading tests were always performed until material failure of bolts or shear stress failure at the interface cement-rock. At each location, basic geotechnical survey was carried out in the form of core drilling in a length of 3.0 metres with the assessment of the rock mass in situ, and laboratory testing of rock mechanics. Upon the completion of testing protocols, rock mass properties analysis was performed focusing on the evaluation of shear friction at the grouting-rock interface.
机译：在一个研究项目“ FR-TI4 / 329研究与开发”中，创建了一个用于土壤和岩石锚固的设计和分析的应用系统，包括监测元件的开发a”。执行。测试在14个地点进行，岩石组成各异。在进行初始测试之前，已设计并建造了一个装载台。对长度为0.5至2.5 m，直径为22-32 mm的螺栓进行了201项拉伸试验。它们是全螺纹杆，自钻杆和玻璃纤维杆。将螺栓夹紧在水泥和树脂中。载荷试验一直进行到螺栓的材料失效或界面水泥岩的剪切应力失效为止。在每个位置，都以岩心钻探的形式进行了基本的岩土勘测，钻探长度为3.0米，包括对岩体的原位评估和岩石力学的实验室测试。测试方案完成后，进行岩体性质分析，重点是评估注浆-岩石界面处的剪切摩擦力。

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