大断面复用顺槽耦合让压支护技术研究

Research on Coupling Yieldable Support Technology in Large-Section Reuse Gate Roadway

摘要: 文章针对长平煤业有限责任公司大断面复用顺槽出现的围岩变形大，且返修后仍不能有效控制巷道稳定的支护难题，采用耦合让均压锚杆与锚索支护系统在43142巷进行了支护试验。试验巷道选用高强让均压应力显示锚杆和耦合让压锚索，设计安装载荷分别为40 kN和120 kN。工业性实验后知：试验巷道顶板下沉量最大值180 mm，两帮移近量最大值495 mm，最大底鼓量600 mm。通过安装高强度、高预紧力耦合让均压锚杆和耦合让压锚索支护系统能适应大断面复用顺槽的支护要求，实现了43142巷的一次支护成功。

Abstract: In view of acute distortion of slant road surrounding rock during large-section reuse gate roadway and poor stability of overhauled tunnel in Changping Coal Limited Liability Company, an experiment with yieldable bolt and cable bolt support system was carried out in tunnel 43142. In the experiment, high strength yieldable bolts and coupling yieldable anchor cables were deployed, the prestress of anchor bolts and anchor cables was designed to be 40 kN and 120 kN respectively. The monitoring data showed that the maximal close displacement of the two sides was 495 mm and the maximal of the floor heave was 600 mm. The results showed that a successful support in tunnel 43142 was achieved by enhancing high strength prestress yieldable of the support system.