新型全长多点楔胀式管缝锚杆(竹节式锚杆)的试验研究

全长多点楔胀式管缝锚杆(竹节式锚杆)是一种作用机理及结构与普通锚杆均有所不同的新型锚杆，其锚固力由锚杆杆体与岩体的摩擦力、锚杆杆端的锚固力与多点楔胀力所提供的。对新型锚杆进行了数值模拟和物理试验，其实验室试验证实，新型锚杆的拉拔力比普通锚杆的拉拔力提高39％。结果表明，此种锚杆具有优异的力学性能、施工方便，完全可以在工程支护领域中推广应用。

TESTING STUDY ON A NEW KIND OF FULLY-ANCHORED AND MULTI-WEDGED SLOTTED TUBE BOLT (BAMBOO-LIKE BOLT) RESEARCHED IN LABORATORY

A new kind of fully-anchored and multi-wedged slotted tube bolt,alias bamboo-like bolt,is different from currently bolt in functional mechanism and configuration. The bamboo-like bolt is of the characteristics of other full-anchored and end-anchored bolts,and especially the characteristics of multi-anchored bolts. The anchoring force of fully-anchored and multi-wedged slotted tube bolt is comprised of the friction between rock- mass and bolt,bolt end anchorage and multi-wedging force. Testing study is made in laboratory on the anchoring force of the bolt. According to the test result,the average drawing force the bolt is 918. kN and the drawing force of usual slotted tube bolt is only 66 kN,so that the drawing force of the bolt is increased 39%. At the same time,in order to know the working mechanism of the bamboo-like bolts,the RFPA (rock failure process analysis) is used to simulate the shear stress fields of bolt and displacement fields between bolt and rockmass. Moreover the bamboo-like bolts can be installed very simply in rockmass. The results show that fully-anchored and multi-wedged slotted tube bolt is of super mechanical capability and constructional convenience,and can be widely used in supporting and rock engineering.