接触面粗糙度对红黏土-混凝土接触面力学性质的影响

发布时间：2018-05-20 05:41

本文选题：粗糙度 + 结构接触面　；参考：《中南大学学报(自然科学版)》2016年05期

【摘要】：在混凝土试块上设计了粗糙度不同的表面,以该表面作为土-混凝土接触面,并采用灌砂法测定了接触面粗糙度。利用大型直剪试验仪对红黏土-混凝土试块接触面进行了剪切试验,定量分析接触面粗糙度对接触面抗剪强度参数、接触面剪应力-切向位移关系以及红黏土剪胀(缩)性的影响。研究结果表明:接触面粗糙度对红黏土-混凝土接触面的内摩擦角影响不大。在接触面粗糙度增大至临界粗糙度的过程中,接触面黏聚力随粗糙度的增大而增大,并逐渐趋近于红黏土自身的黏聚力。接触面粗糙度对剪应力-切向位移关系影响较大。接触面粗糙度对接触面上部土体的影响范围是有限的。该极限影响范围对应于临界粗糙度。当接触面粗糙度小于临界值时,接触面粗糙度越大,其对接触面上部土体的影响范围越大。当接触面粗糙度超过临界值,该影响范围不再变化。法向应力较低时,红黏土主要表现出剪胀性。接触面粗糙度对红黏土剪胀(缩)性影响不大。
[Abstract]:A surface with different roughness was designed on the concrete sample. The surface was used as the soil-concrete interface, and the roughness of the contact surface was measured by the method of sand filling. The shear test of red clay concrete interface was carried out by using a large direct shear tester, and the parameters of the contact surface roughness to the shear strength of the contact surface were quantitatively analyzed. The relation between shear stress and shear displacement of contact surface and the effect of dilatancy (shrinkage) of red clay. The results show that the roughness of the contact surface has little effect on the internal friction angle of the red clay-concrete interface. In the process of increasing the roughness of the contact surface to the critical roughness, the cohesive force of the contact surface increases with the increase of the roughness, and gradually approaches the cohesion of the Yu Hong clay itself. The roughness of contact surface has great influence on the relationship between shear stress and tangential displacement. The influence of surface roughness on the upper soil is limited. The limit influence range corresponds to the critical roughness. When the roughness of the contact surface is less than the critical value, the greater the roughness of the contact surface is, the greater the influence range of the surface roughness is on the upper soil mass of the contact surface. When the roughness of the contact surface exceeds the critical value, the range of influence will not change. When the normal stress is low, the red clay mainly shows shear dilatancy. The roughness of contact surface has little effect on the dilatancy (shrinkage) of red clay.
【作者单位】：中南大学土木工程学院;天津市市政工程研究院;
【基金】：国家自然科学基金资助项目(51378514)~~
【分类号】：TU446

【相似文献】