新型高预应力锚索及锚注联合支护技术研究与应用

发布时间：2018-10-22 15:54

【摘要】：针对现有支护材料及工艺难以适用于深部软岩巷道大变形的支护难题,在理论分析、室内试验的基础上研发了新型高预应力锚索及其配套工艺,该新型锚索可施加初始预应力达70~100 k N,杆体延伸率10%~12%,可有效阻止开挖后围岩的快速变形,保持围岩的整体性和稳定性,并具有成本低、强度高、不易松动等优点;依据典型深部软岩巷道围岩变形特征及破坏机制,提出了以新型高预应力锚索和注浆锚杆为核心的联合控制技术,即支护初期采用以新型高预应力锚索为主,金属网、混凝土喷层为辅的柔性支护;后期进行全断面注浆,内外结合,从根本上提高支护强度。经现场试验证明,该技术能有效提高锚索受力状态,降低围岩变形速率,缩短围岩变形时间,围岩最终变形量只为原支护方案的30%左右,锚索平均受力提高了近4.7倍,取得了良好的支护效果,具有重要的推广应用价值。
[Abstract]:In view of the difficult problem that the existing supporting materials and techniques are difficult to be applied to the large deformation of deep soft rock roadway, a new type of high prestressed anchor cable and its supporting technology are developed on the basis of theoretical analysis and laboratory test. This new type of anchor cable can apply initial prestress up to 70 ~ 100kN, and the elongation of the rod body is 10 ~ 12. It can effectively prevent the rapid deformation of the surrounding rock after excavation, maintain the integrity and stability of the surrounding rock, and has the advantages of low cost, high strength and not easy to loosen. According to the deformation characteristics and failure mechanism of surrounding rock in typical deep soft rock roadway, the combined control technology with new type high prestressed anchor cable and grouting anchor rod as the core is put forward, that is, the new type of high prestressed anchor cable and metal mesh are adopted in the initial supporting stage. The soft support with concrete shotcrete layer as auxiliary, the whole section grouting and the combination of inside and outside are carried out in the later stage, so as to improve the support strength fundamentally. The field test shows that the technology can effectively improve the stress state of anchor cable, reduce the deformation rate of surrounding rock, shorten the deformation time of surrounding rock, the final deformation of surrounding rock is only about 30% of the original support scheme, and the average force of anchor cable is increased nearly 4.7 times. Good support effect has been obtained, which has important value of popularization and application.
【作者单位】：山东大学岩土与结构工程中心;山东金阳矿业集团有限公司;济南力稳岩土工程有限公司;
【基金】：国家自然科学基金面上资助项目(51379114)
【分类号】：TD353

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