微小应变下堆石料的变形特性

Deformation characteristics of rockfill at small strains

在土工三轴试验中应用一种微小应变测试装置———局部位移计 ,不仅使试验精度提高了一个量级 ,即达到 0 .0 0 1% (10 -5) ,而且能够在一次试验中的同一个试样上准确而连续地量测 10 -6～ 10 -1应变范围内的变形特性。应用这种测试新技术 ,着重研究了堆石料在微小应变下各种变形模量与应变水平或应力水平之间的相关性 。

The local displacement transducer(LDT) represents a latest measurement technique in triaxial test.The LDT can be used to increase the precision of strain to 0.001%(10 -5 ) and to measure the deformation characteristics accurately and continuously in a strain range from less than 0.001% to 1% in a single test.This paper studies the relationships between modulus and strain level or stress level in a small strain range.Some beneficial conclusions are obtained.