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Combined supporting method for high-ground-stress large-section soft rock tunnel
The invention discloses a combined supporting method for a high-ground-stress large-section soft rock tunnel, and belongs to the technical field of underground cavern excavation supporting construction.The combined supporting method comprises the steps that pre-tightening force is applied after a pre-stressed anchor rod is installed, friction between rock stratums is enhanced, surrounding rock within the anchoring range is clamped, and a stable bearing structure is formed; the surrounding rock is reinforced through reasonable distribution of the prestressed anchor rods and mutual superposition effect of compression areas; the pre-stressed anchor cable is connected with the pre-stressed anchor rod support and the deep surrounding rock, and the bearing capacity of the deep surrounding rock is stimulated; the construction length of the anchor cable is flexible, and the anchor cable and the pre-stressed anchor rod form a complementary combined reinforcing effect; the anchor bar pile improves the pressure bearing capacity of the anchoring body by enhancing the bonding friction between the anchoring body and the rock-soil body. The problems that a common surrounding rock support is difficult to achieve stability and safety of surrounding rock in a high-ground-stress large-section ultra-buried-depth metamorphic soft rock cavern section, engineering soft rock is large in deformation and the like are solved, and then the overall stability of a support system is improved.
本发明公开了一种高地应力大断面软岩隧洞的联合支护方法，属于地下洞室开挖支护施工技术领域，通过预应力锚杆在安装后施加预紧力，增强岩层间的摩擦，夹紧锚固范围内的围岩，形成稳固的承载结构；通过合理分布预应力锚杆，受压区域相互叠加作用，实现对围岩的加固；预应力锚索通过连接预应力锚杆支护与深部围岩，并激发深部围岩的承载能力；锚索施工长度灵活，与预应力锚杆形成互补的联合加固作用；锚筋桩通过增强锚固体与岩土体的黏结摩擦，提高锚固体的承压能力。解决了普通围岩支护在高地应力大断面、超埋深变质软岩洞段难以实现围岩的稳定与安全的问题、工程软岩大变形等问题，进而提高支护系统的整体稳定性。
Combined supporting method for high-ground-stress large-section soft rock tunnel
The invention discloses a combined supporting method for a high-ground-stress large-section soft rock tunnel, and belongs to the technical field of underground cavern excavation supporting construction.The combined supporting method comprises the steps that pre-tightening force is applied after a pre-stressed anchor rod is installed, friction between rock stratums is enhanced, surrounding rock within the anchoring range is clamped, and a stable bearing structure is formed; the surrounding rock is reinforced through reasonable distribution of the prestressed anchor rods and mutual superposition effect of compression areas; the pre-stressed anchor cable is connected with the pre-stressed anchor rod support and the deep surrounding rock, and the bearing capacity of the deep surrounding rock is stimulated; the construction length of the anchor cable is flexible, and the anchor cable and the pre-stressed anchor rod form a complementary combined reinforcing effect; the anchor bar pile improves the pressure bearing capacity of the anchoring body by enhancing the bonding friction between the anchoring body and the rock-soil body. The problems that a common surrounding rock support is difficult to achieve stability and safety of surrounding rock in a high-ground-stress large-section ultra-buried-depth metamorphic soft rock cavern section, engineering soft rock is large in deformation and the like are solved, and then the overall stability of a support system is improved.
本发明公开了一种高地应力大断面软岩隧洞的联合支护方法，属于地下洞室开挖支护施工技术领域，通过预应力锚杆在安装后施加预紧力，增强岩层间的摩擦，夹紧锚固范围内的围岩，形成稳固的承载结构；通过合理分布预应力锚杆，受压区域相互叠加作用，实现对围岩的加固；预应力锚索通过连接预应力锚杆支护与深部围岩，并激发深部围岩的承载能力；锚索施工长度灵活，与预应力锚杆形成互补的联合加固作用；锚筋桩通过增强锚固体与岩土体的黏结摩擦，提高锚固体的承压能力。解决了普通围岩支护在高地应力大断面、超埋深变质软岩洞段难以实现围岩的稳定与安全的问题、工程软岩大变形等问题，进而提高支护系统的整体稳定性。
Combined supporting method for high-ground-stress large-section soft rock tunnel
一种高地应力大断面软岩隧洞的联合支护方法
YAN HENGBIN (author) / CHEN YUQI (author) / MA LI (author) / MA JUNLIN (author)
2024-10-25
Patent
Electronic Resource
Chinese
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