1. 济南大学 土木建筑学院,山东,济南,250022
2. 山东大学 岩土与结构工程研究中心,山东,济南,250061
3. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏,徐州,221116
4. 兖矿集团有限公司,山东 邹城,273500
5. 龙口煤电有限公司,山东 龙口,265700
网络首发:2018-06-05,
纸质出版:2017
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江 贝, 李术才, 王 琦, 等. 基于上限法的深部大断面回采巷道顶板锚索设计方法研究[J]. 岩土力学, 2017,38(8):2351-2357.
JIANG Bei, LI Shu-cai, WANG Qi, et al. Design method of roof anchor cable for deep large section mining roadways based on the upper bound method[J]. 2017, 38(8): 2351-2357.
江 贝, 李术才, 王 琦, 等. 基于上限法的深部大断面回采巷道顶板锚索设计方法研究[J]. 岩土力学, 2017,38(8):2351-2357. DOI: 10.16285/j.rsm.2017.08.024.
JIANG Bei, LI Shu-cai, WANG Qi, et al. Design method of roof anchor cable for deep large section mining roadways based on the upper bound method[J]. 2017, 38(8): 2351-2357. DOI: 10.16285/j.rsm.2017.08.024.
针对目前深部大断面回采巷道控制难题和相应的高强锚索控制技术,考虑顶板围岩应力与支护荷载影响,利用Hoek-Brown强度准则及塑性力学中的极限分析上限法,得到了大断面巷道顶板的冒落破坏机制,提出了顶板锚索长度及匹配预紧力的设计方法。基于建立的锚索设计参数影响因素敏感性指标对巷道宽度、岩体重度、围岩应力、岩体抗压强度、抗拉强度、锚索布设间距、顶角锚索布设倾角等因素的影响进行了分析。结合现场实际情况,提出了深部大断面回采巷道围岩控制的工程建议。将此设计方法应用到千米深井赵楼煤矿1305孤岛工作面的运输顺槽顶板锚索参数确定中,有效地控制了围岩变形。研究表明:在高应力大断面回采巷道中,顶板锚索需锚固在稳定岩层中,并施加足够的预紧力,才可有效控制顶板围岩冒落或破坏;顶板锚索所需预紧力随岩体抗拉强度、抗压强度及岩体经验参数A的增大而减小,随巷道宽度、岩体重度、围岩应力、锚索布设间距、顶角锚索布设角度以及岩体经验参数B的增大而增大,其敏感性最高的影响因素为围岩应力。因此,在深部高地应力巷道设计中,需特别重视地应力的影响,采用高强、高延伸率锚索,增设锚索定量让压装置,高阻让压有效释放围岩应力,并通过施加高预紧力或注浆加固等方式来提高围岩完整性,获得较好的围岩控制效果。
The aim of this study is to resolve the present control problems and the corresponding high-strength anchor cable control technology in deep large section roadways. This study was based on the Hoek-Brown criterion and the upper bound theorem of the limit analysis and also considered the stress of surrounding rock in the roof and the effect of supporting the load. On the above basis
the roof caving mechanism of large-section roadways was acquired. Furthermore
a design method for roofs was put forward for the minimum length and the pre-tightening force of an anchor cable. Since the design parameters of anchor cables was affected by established sensitivity indexes
it is important to investigate the effects of established sensitivity indexes on factors
such as the roadway’s width
the specific weight of the rock mass
the stress in the surrounding rock
the compressive strength and the tensile strength of the rock mass
anchor cable layout spacing and vertex anchor cable laying angle. According to the actual field conditions
engineering suggestions are proposed for controlling surrounding rocks in the deep large-section roadway. Finally
this design method was applied to determine the roof anchor parameters of transport gateway of 1305 Island Coal Face in the Kilometer Deep Well Zhaolou coal mine
which effectively controlled the deformation of surrounding rock. From research results
only when the roof anchor cable was anchored in stable rock and enough pre-tightening force was exerted
the roof rock caving and damage can be effectively controlled in high-stress large-section mining roadways. It is found that roof pre-tightening force for anchor cable decreased with the increase of tensile strength
compressive strength and empirical parameter A of rock mass. Besides
this roof pre-tightening force increased with increasing the width of the roadway
the specific weight of rock mass
the stress in the surrounding rock
the compressive strength and the tensile strength of rock mass
anchor cable layout spacing
vertex anchor cable laying angle and empirical parameter B of rock mass. Moreover
the highest sensitivity of all the influencing factors turned out to be the surrounding rock stress. This indicates that special attention should be paid to the influence of in-situ stress of the surrounding rock when designing the deep high-stress roadways. Therefore
the effective release of the surrounding rock stress can be achieved by using the high strength
high elongation anchor cable and adding the yieldable device. Meanwhile
the integrity of the surrounding rock can be improved by applying high pre-tightening force and grouting reinforcement
resulting in better control performance of surrounding rock.
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