冻土与混凝土接触面直剪试验研究

摘要

In order to study the mechanical behavior of frozen soil‐concrete interface , a series of direct shear tests were conducted on the large scale temperature‐controlled direct shear apparatus for coarse grained soil . The same features can be found both on the average shear stress‐shear displacement τ‐u and vertical displace‐ment‐shear displacement ν‐u curves . Through comparison tests with different factors , the influence of vertical pressure , temperature and water content on the shear strength of interface was summarized . Fitted empirical equations between factors and shear strength were presented . A theory regarding the peak shear strength and residual shear strength of the interface was proposed to explain the curve changes in the tests when different factors were applied .%为研究冻土与混凝土接触面的力学性质，利用土工粗颗粒土直剪试验系统进行一系列接触面直剪试验。试验得出的平均剪应力‐水平位移曲线和垂直位移‐水平位移曲线均表现出明显的分段特征。通过不同参数的对比试验，总结垂直压力、温度、含水量对接触面抗剪强度的影响，给出拟合的经验公式。提出接触面峰值抗剪强度和残余抗剪强度的原理，来解释选用不同参数时试验曲线的变化。