短螺栓型膨胀式自应力灌浆卡箍滑动承载力试验研究

Tests on slip capacity for the short-bolt-type expansive stressed grouted clamp

对短螺栓型膨胀式自应力灌浆卡箍的滑动承载力进行了试验研究,首先从自应力产生机理介绍了短螺栓型灌浆卡箍结构,分析了这种结构的特点和优越性,然后在不同膨胀剂掺量和长细比下进行了这种卡箍试件的滑动承载力测试。试验结果表明：滑动承载力随着膨胀剂掺量的增加线性增加;在长细比为1.02~1.67的范围内,滑动应力差异不大,但当长细比增加到3.33时,滑动应力明显降低;而且短螺栓型膨胀式自应力灌浆卡箍比近似结构尺寸的传统长螺栓型卡箍能提供更大的滑动应力。试验结果为短螺栓型膨胀式灌浆卡箍的工程应用提供了一定的设计依据。

Tests on the slip capacity of the short-bolt-type expansive stressed grouted clamp are carried out. Based on the mechanism of self-stress formation,the proposed short-bolt-type grouted clamp is introduced and its structural feature and superiority are analyzed.Then the slip capacity of the clamp model is tested under different agent contents and different slenderness ratios. The test result demonstrates that the slip capacity increases linearly with the increase of the agent content. The slip stress changes are very small within the slenderness ratio range of 1. 02 to 1. 67. But the slip stress decreases obviously when the slenderness ratio increases to 3. 33.And the short-bolt expansive stressed grouted clamp can provide larger slip stress than the traditional long-bolt clamp with the similar structural size. The tests introduced in this paper will establish a design foundation for engineering application of the short-bolt-type expansive grouted clamp.