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Interfacial shear strength of geosynthetics using the cylinder direct shear test.

机译：土工合成材料的界面剪切强度采用圆柱直接剪切试验。

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摘要

Various methods are available for interface friction testing of geosynthetics. The 0.3-m x 0.3-m direct shear device for testing of geosynthetics has been standardized through the development of ASTM Standard D-5321. The direct shear test provides both peak and residual shear strength. The primary limitation of the 0.3-m direct shear test is the limited displacement available. Many geosynthetics experience a loss of shear strength with increasing displacement, and the loss of interface shear strength in the field through creep, earthquake loading, construction activities, or other reasons could lead to failure. Knowing the interface properties and understanding the consequences of low shear strengths at large displacements is important. The displacement available for the 0.3-m direct shear is a few centimeters, while field failures often are measured in meters. A new interface shear strength test device that provides field-scale displacements in the lab was needed.; The Cylinder Direct Shear test device (patent pending) allows measurement of interface friction parameters and the residual shear strength at unlimited displacements. The new device has one geosynthetic material fastened to a rotating drum, with the second geosynthetic interface material rigidly attached to a stationary anchor bar. The normal stress is provided using a pressure chamber. Interface friction is determined between the two geosynthetics based on the torque necessary to turn the cylinder, and displacement is determined by measuring the cylinder rotation.; The Cylinder Direct Shear offers single direction unlimited displacement capabilities without the displacement limitations of the direct shear and without the rotational limitations of the ring shear test. Geosynthetic interface tests have been performed with up to 85 cm of displacement for single tests, and up to 3.3 m of total displacement for staged tests. The results of the Cylinder Direct Shear compare favorably with conventional 0.3-m direct shear testing. The new device significantly extends the range and capabilities of direct shear testing.
机译：有多种方法可用于土工合成材料的界面摩擦测试。通过ASTM D-5321标准的开发，用于土工合成材料测试的0.3-m x 0.3-m直接剪切装置已经标准化。直接剪切测试可提供峰值和残余剪切强度。 0.3米直接剪切测试的主要限制是有限的位移。许多土工合成材料会随着位移的增加而承受剪切强度的损失，并且由于蠕变，地震荷载，建筑活动或其他原因而导致的界面抗剪强度的损失会导致破坏。重要的是要了解界面特性并了解大位移下低剪切强度的后果。 0.3米直接剪切的可用位移为几厘米，而现场破坏通常以米为单位。需要一种新的界面抗剪强度测试设备，以在实验室中提供现场规模的位移。圆柱直接剪切测试设备（正在申请专利）可以测量界面摩擦参数和无限位移下的残余剪切强度。新设备具有一种固定在旋转鼓上的土工合成材料，而第二种土工合成界面材料则牢固地固定在固定的锚杆上。使用压力室提供法向应力。根据旋转圆柱体所需的扭矩确定两个土工合成材料之间的界面摩擦，并通过测量圆柱体旋转来确定位移。圆柱直接剪切功能提供了单向无限位移能力，而没有直接剪切的位移限制，也没有环形剪切测试的旋转限制。进行土工合成材料界面测试时，单个测试的位移最大为85 cm，分阶段测试的总位移最大为3.3 m。圆柱直接剪切的结果与传统的0.3米直接剪切测试相比具有优势。新设备大大扩展了直接剪切测试的范围和功能。

著录项

  • 作者

    Moss, Arthur Lowell.;

  • 作者单位

    Utah State University.;

  • 授予单位 Utah State University.;
  • 学科 Engineering Civil.; Engineering Environmental.; Geotechnology.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 271 p.
  • 总页数 271
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;环境污染及其防治;地质学;
  • 关键词

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