一种透明土的抗剪强度特性试验研究

Experimental Study on the Shear Strength Characteristics of a Transparent Soil

为探究透明土的抗剪强度特性,对干、湿状态下的石英砂进行直剪试验,通过荷载–剪切位移曲线、拟合强度线进行对比分析。结果表明:随着剪切位移增大,石英砂由应变硬化转为应变软化,混合白油的石英砂在不同垂直荷载作用下,均会出现应变软化,混合蒸馏水的石英砂均出现应变硬化现象;粘聚力方面,石英砂最小,混合蒸馏水的石英砂次之,混合白油的石英砂最大;内摩擦角方面,石英砂最大,混合蒸馏水的石英砂次之,混合白油的石英砂最小;总体强度上,当垂直荷载较大时,石英砂强度最大,其次是混合蒸馏水的石英砂,最小是混合白油的石英砂。

In order to explore the shear strength characteristics of transparent soil, direct shear tests were carried out on quartz sand under dry and wet conditions. The results show that with the increase of shear displacement, quartz sand changes from strain hardening to strain softening, quartz sand mixed with white oil will appear to strain softening under different vertical loads, and quartz sand mixed with distilled water will appear to strain hardening;In terms of cohesion, quartz sand is the smallest, followed by quartz sand mixed with distilled water, and quartz sand mixed with white oil is the largest. In terms of internal friction angle, quartz sand is the largest, followed by quartz sand mixed with distilled water, and quartz sand mixed with white oil is the smallest. In terms of overall strength, when the vertical load is large, the strength of quartz sand is the largest, followed by quartz sand mixed with distilled water, and the smallest is quartz sand mixed with white oil.