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高应力软岩巷道可接长锚杆让压支护技术

王飞, 刘洪涛, 张胜凯, 孙建辉, 李育吉, 蔡猛

王飞, 刘洪涛, 张胜凯, 孙建辉, 李育吉, 蔡猛. 高应力软岩巷道可接长锚杆让压支护技术[J]. 岩土工程学报, 2014, 36(9): 1666-1673. DOI: 10.11779/CJGE201409013
引用本文: 王飞, 刘洪涛, 张胜凯, 孙建辉, 李育吉, 蔡猛. 高应力软岩巷道可接长锚杆让压支护技术[J]. 岩土工程学报, 2014, 36(9): 1666-1673. DOI: 10.11779/CJGE201409013
WANG Fei, LIU Hong-tao, ZHANG Sheng-kai, SUN Jian-hui, LI Yu-ji, CAI Meng. Yieldable technology of lengthened bolts for high-stress soft rock roadways[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1666-1673. DOI: 10.11779/CJGE201409013
Citation: WANG Fei, LIU Hong-tao, ZHANG Sheng-kai, SUN Jian-hui, LI Yu-ji, CAI Meng. Yieldable technology of lengthened bolts for high-stress soft rock roadways[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1666-1673. DOI: 10.11779/CJGE201409013

高应力软岩巷道可接长锚杆让压支护技术  English Version

基金项目: 国家自然科学基金项目(51204187,51234005); 北京
详细信息
    作者简介:

    王飞(1988- )男,硕士研究生,主要从事矿山压力及岩层控制和巷道支护方面研究。E-mail: wangfeialvin@163.com。

  • 中图分类号: TU43;TD353

Yieldable technology of lengthened bolts for high-stress soft rock roadways

  • 摘要: 高应力软岩巷道的塑性区范围和变形量均较大,其稳定型控制需要支护材料具备良好的延伸性能及深部锚固特性。基于“高阻让压”而研发的可接长锚杆长度大于4 m、延伸率为17%,破断载荷为195 kN,能够适应此类巷道的变形破坏特征。根据支护材料和围岩的变形破坏特征,分别建立了可接长锚杆和“锚杆+锚索”支护系统的本构模型,结果表明:为保证支护结构稳定,避免支护系统本构模型失稳后应变量剧增,支护系统本构模型的应变上限不能超过支护元件的最大应变量;可接长锚杆能够能提供远大于锚索的让压距离,保障软岩巷道支护系统的支护强度和稳定性。试验条件下,可接长锚杆的平均支护阻力约为170.2 kN,顶板0~4 m内围岩理论变形量为264 mm,与工程实际变形量比较接近,起到了对高应力软岩巷道顶板的让压支护的目标。
    Abstract: Due to their large deformation and plastic zones, the high-stress soft rock roadways, for stability control, need the support materials which have high elongation, and are anchored to the deep layer of the roof rock. Based on the theory of “strong support and yield pressure”, a new type of lengthened bolt is invented to adapt to the deformation and failure of the soft rock roadways. Its length, elongation and broken load are 4 m, 17% and 195 kN, respectively. The constitutive models for lengthened bolt support system and bolt-cable support system are established. The result shows that the upper limit strain of constitutive model for support system should not exceed the maximum strain of support materials in order to guarantee the stability of support structure. The new lengthened bolt can provide more yield-pressure distance than the cable, which exactly assures both the stability and the support strength of the lengthened bolt support system in soft rock roadways. Under the experimental conditions, the resistance of the lengthened bolt support is about 170.2 kN, and the theoretical rock deformation, 0 m to 4 m away from the roadway roof, is 264 mm, which is close to the actual deformation value. The goal of “yield support” in high-stress soft rock roadways is effectively achieved.
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出版历程
  • 收稿日期:  2013-12-26
  • 发布日期:  2014-09-21

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