SOME EXPERIMENTS ON THE INFLUENCE OF STRAIN CONDITIONS ON THE STRENGTH OF SAND
SOME EXPERIMENTS ON THE INFLUENCE OF STRAIN CONDITIONS ON THE STRENGTH OF SAND
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DOI：
10.1680/geot.1964.14.2.143
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发表时间：
1964-06
期刊：
影响因子：
5.8
通讯作者：
D. Cornforth
中科院分区：
文献类型：
--
作者：
D. Cornforth
本文简要介绍了伦敦帝国理工学院研制的平面应变仪，以及用于制备和测试砂样的技术。本文叙述了黄铜砂在平面应变条件下的剪切特性，指出平面应变中的中间主应力值远小于其它两个主应力之和的一半。本文还对黄砂在平面应变压缩试验中的排水强度与在相同密度下的三轴试验中的排水强度进行了比较。强度-密度曲线具有相同的一般形状，但平面应变强度总是较高，强度差从松散砂中的约1/2 °逐渐增加到所测试的密实试样中的4°以上。而三轴压缩和拉伸试验则近似符合一个共同的强度-密度曲线。在平面应变压缩试验中测得的极限强度是恒定的，不受应力的影响。
Synopsis The Paper describes briefly the plane strain apparatus developed at Imperial College, London, and the techniques employed to prepare and test specimens of sand. The characteristics of Brasted sand sheared under plane strain conditions are described and it is noted that the value of the intermediate principal stress in plane strain is considerably less than one-half the sum of the other two principal stresses. The drained strengths of Brasted sand in plane strain compression tests are compared with strengths measured in triaxial tests at the same placement density. The strength-density curves have the same general shape but the plane strain strengths are always higher, the differences in strength increasing progressively from about ½° in loose sand to more than 4° in the densest specimens tested. On the other hand, triaxial compression and extension tests agree approximately to a common strength-density curve. The ultimate strengths measured in plane strain compression tests are constant, irrespec...