填土中锚固体–土接触面剪切特性研究

自行研发了一种锚固体–土接触面剪切装置,该装置能够充分考虑锚杆的实际形状特征和剪切方向,并具有能够保证剪切过程中接触面面积不变等特点,并为研究锚杆锚固体–土剪切特性提供一种新方法。利用该装置,共完成了35个不同条件下的锚固体–土剪切试验,深入研究了法向压力、土样压实度和土样含水率等因素对锚固体–土接触面剪切特性的影响。研究结果表明:压实度相同情况下,土体含水率w大小,对锚杆抗拔力取值具有重要的影响,越接近最优含水率,越有利于接触面剪应力的发挥;土体压实度对接触面剪应力的影响十分明显,压实度越大,接触面剪切参数越大,但始终小于土体的剪切参数。

Shear characteristics of anchoring solid-soil interface in filled soil

A testing apparatus simulating the frictional behavior of anchoring solid-soil interface is developed to study the real response of the anchoring solid-soil interface for anchor system. The shape characteristics of anchoring solid and shear direction of tests are considered in the devices and the shear area of anchoring solid-soil interface will not change during the whole tests. It is a new method for the study on the shear characteristics of anchoring solid-soil interface. Thirty-five tests under different circumstances are completed on this testing system, and the shear characteristics of anchoring solid-soil interface are studied after investigating deeply the influences of preasure on soil surface, degree of compaction of filled soil and water content of filled soil. The results indicate that the water content of filled soil has impact on the resistance of anchor abviously with the same degree of compaction. The closer the optimum water content, the larger the shear stress. Moreover, it is indicated that the degree of compaction of filled soil also has impact on the resistance of anchor abviously. The greater the degree of compaction, the greater the shear parameter of interface which is always less than the shear parameter of filled soil.