论文中文题名: | 高应力软岩回采巷道锚网索耦合支护技术研究 |
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学号: | 201012588 |
保密级别: | 公开 |
学科代码: | 081901 |
学科名称: | 采矿工程 |
学生类型: | 硕士 |
学位年度: | 2013 |
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论文外文题名: | Research on Cable Anchor Coupled Support of Gateway with High Stress Soft Rock Roadway |
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论文中文摘要: |
软岩巷道支护问题至今没有得到很好的解决,特别是高应力软岩回采巷道支护难度大,返修次数多,严重影响生产安全及浪费大量的维修费用,因此,研究高应力软岩巷道稳定性问题具有重要的经济效益和社会意义。
船景煤矿1122运输巷道处于典型的高应力软岩环境下,底鼓、片帮及冒顶严重,巷道支护问题极为突出。论文综合运用现场调研、理论分析、实验室试验、数值模拟及工程实践等方法,对高应力软岩回采巷道稳定性控制进行了研究,结果表明:
高应力软岩巷道围岩在低压状态下单轴抗压强度较高,遇水后强度急剧降低,呈碎屑状,地质雷达测试围岩松动圈半径为2.03~2.98m,为Ⅴ类不稳定围岩;原支护方案下的围岩变形以底鼓为主,且初期变形速率快,持续时间长,变形量大,主要影响因素是埋深大(600m),高构造应力及断面形状。针对以上问题,提出了高应力软岩巷道采用带反底拱直墙半圆拱锚网索耦合支护技术方案,并针对原支护方案下的顶板两帮变形量及速率确定了现方案下锚网索的最佳耦合支护时间:锚杆及时支护,锚索滞后锚杆2~3天,并通过数值模拟优化出锚杆锚索托板尺寸分别是100×100×8mm,200×200×14mm。
工程实践表明该支护技术方案有效地控制了围岩的剧烈变形,确保了巷道长期安全稳定性,取得了良好的技术经济效益。
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论文外文摘要: |
The problem about support of soft rock roadway has not been solved better yet. It is difficult to support especially in mudding soft rock extraction roadway with high stress, and need to rework several times, which affects production safety seriously and wastes high cost of roadway maintenance. So studies on the stability of soft rock roadway with high stress have great significant in economic and social.
It is a typical soft rock with high stress environment with 1122 haulage roadway in Chuanjing coal mine.due to severe floor heave, rib spalling and roof fall, and it is extremely prominent in roadway support.In this paper, we apply comprehensively field research, theoretical analysis, laboratory experiment, numerical simulation, engineering practice and other methods around the problem about controlling the stability of high stress soft roadway. Results indicate that:
The axial compressive strength of surrounding rock is high at low pressure state in soft rock roadway with high stress, and the strength decreases sharply after in water, and takes on clastic. The surrounding rock loose circle of radius is 2.03~2.98m through geological radar test, which belongs to V class of unstable surrounding rock. The deformation of surrounding rock is mainly to floor heave, and the quick initial deformation rate, a long continued time, large deformation in primary support plan, which the depth (600m), high tectonic stress and section shape are the main factors. In view of the above problems, we put forward the inverted arch and straight wall semicircle arch cable anchor coupling support technology scheme in soft rock roadway with high stress, and determine the best coupling support time of anchor cable through deformation and the rate of the roof and slopes: anchor supports in time, anchor cable lags anchor 2~3 days in the original supporting scheme, and optimizate anchor pallet size is 100×100×8mm, 200×200×14mm by numerical simulation.
Engineering practice shows that the support technology scheme can effectively control the intense deformation of surrounding rock roadway, and ensure the long-term safety and stability, and achieved better technical and economic benefits.
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中图分类号: | TD353 |
开放日期: | 2013-06-19 |