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首页> 外文期刊>Geotechnical and geological engineering >Foundation of a Gravity Dam on Layered Soft Rock: Shear Strength of Bedding Planes in Laboratory and Large 'In Situ' Tests
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Foundation of a Gravity Dam on Layered Soft Rock: Shear Strength of Bedding Planes in Laboratory and Large 'In Situ' Tests

机译：层状软岩上的重力坝基础：实验室层理平面的抗剪强度和大型“原位”测试

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摘要

A 100 m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded sandstone strata. Claystone weathering was identified in vertical and horizontal profiles of water content and dry density. Peak and residual strength of rock matrix is given in the paper. Clay and sandstone layers dip 15°-20° in the upstream direction. Dam stability is essentially controlled by the available shear strength at the sedimentation planes. Block samples were recovered for each of the contact types mentioned. They were tested in high capacity shear box machine (30×30 cm). In addition, large scale shear tests (80×80 cm) were performed in situ. The roughness of the sheared plane was determined after each one of the tests. Additional information includes some direct shear tests on joints recovered in borings and the results of residual strength tests performed on clay fillings on a ring shear apparatus. The results of all the tests performed are compared in the paper showing the effect of shearing surface roughness. In general, strength envelopes determined "in situ" exhibit a marked nonlinearity at the low range of confining stresses (0-0.2 MPa). Laboratory tests on smaller specimens show linear Mohr-Coulomb envelopes. Existing relationships between joint roughness and strength envelopes were also included in the comparison. The paper discusses the procedure followed to select an appropriate strength envelope for design purposes on the basis of all the available information. The case points out the difficulty to select unambiguously a suitable design strength for the critical sedimentation surfaces despite the efforts displayed in the field and in the laboratory.
机译：一块100 m高的重力坝（Castrovido大坝，西班牙布尔戈斯）建在一块软的Weald红色粘土岩上，其间有层状砂岩地层。在水含量和干密度的垂直和水平剖面中识别出粘土风化作用。给出了岩石基体的峰值强度和残余强度。粘土和砂岩层在上游方向倾斜15°-20°。大坝的稳定性基本上由沉积平面上的可用抗剪强度控制。对于上述每种接触类型，均回收了块状样品。它们在高容量剪切箱机（30×30 cm）中进行了测试。另外，原位进行了大规模的剪切试验（80×80 cm）。在每个测试之后确定剪切平面的粗糙度。其他信息包括对在钻孔中回收的接缝进行的一些直接剪切试验，以及在环形剪切仪上对粘土填料进行的残余强度试验的结果。在纸上比较了所进行的所有测试的结果，显示了剪切表面粗糙度的影响。通常，“就地”确定的强度包络线在低范围的约束应力（0-0.2 MPa）下表现出明显的非线性。对较小标本的实验室测试显示出线性的Mohr-Coulomb包络线。比较中还包括了接头粗糙度和强度包络线之间的现有关系。本文讨论了在所有可用信息的基础上为设计目的选择合适的强度封套所遵循的程序。该案例指出，尽管在现场和实验室中进行了努力，但仍难以为关键的沉降表面选择合适的设计强度。

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  • 来源
    《Geotechnical and geological engineering》 |2014年第6期|1439-1450|共12页
  • 作者

    Eduardo E. Alonso; Nuria M. Pinyol; Jubert Pineda;

  • 作者单位

    Department of Geotechnical Engineering and Geosciences, Universitat Politecnica de Catalunya, Edificio D-2, Campus Nord, UPC, 08034 Barcelona, Spain;

    Department of Geotechnical Engineering and Geosciences, Universitat Politecnica de Catalunya, Edificio D-2, Campus Nord, UPC, 08034 Barcelona, Spain,International Center for Numerical Methods in Engineering (CIMNE), Barcelona, Spain;

    Department of Geotechnical Engineering and Geosciences, Universitat Politecnica de Catalunya, Edificio D-2, Campus Nord, UPC, 08034 Barcelona, Spain;

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  • 正文语种 eng
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  • 关键词

    Shear strength; Sedimentation planes; Dam foundation; In situ shearing tests;

    机译：剪切强度;沉淀平面;大坝基础;原位剪切试验;

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