钢管混凝土支架与围岩相互作用关系模型试验研究
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摘要
为研究钢管混凝土支架与围岩相互作用关系,通过相似物理模型手段,对巷道应力、变形、破坏随外部荷载变化而变化的过程进行分析,研究其规律,采用铝管内灌注水泥砂浆浆液模拟钢管混凝土支架,极大限度地还原钢管与核心混凝土之间的相互作用关系。试验表明,首先钢管混凝土支架支护是一种被动封闭式支护形式,当钢管混凝土支架某部位先发生变形,此部分四分之一圆弧拱矢跨比减小,承受围岩荷载、变形能力降低;当钢管混凝土支架某部位随后发生变形,此部分四分之一圆弧拱矢跨比增加,承受围岩荷载、变形能力增加。先发生位移处通常发生在软弱岩层及围岩压力大的方向,或因施工问题,没有保证钢管混凝土支架与围岩完全贴合处。再者,钢管混凝土被动提供围岩径向应力,使得围岩承受荷载的能力大幅提高。
In order to further study the interaction relationship between the concrete filled steel tube scaffold and the surrounding rock,this paper records the changes of the stress,deformation and failure of the roadway with the change of the external load by the means of similar physical model,and studies the law of the process. The experiment was first used to simulate the concrete filled steel tube scaffold filled with cement mortar slurry in the aluminum tube,which greatly reduced the relationship between the steel tube and the core concrete. The test shows that,first of all,the support of the concrete filled steel tube support is a passive closed type support form,and the displacement is produced at the first place,and the ratio of the vector span ratio of the 1/4 arc arch decreases and the load and deformation ability of the surrounding rock is reduced.When the displacement occurs after the displacement,the ratio of the 1/4 arc arch is increased. The load and deformability of the surrounding rock increase. The displacement of the first place usually occurs in the direction of the pressure of the weak rock and the surrounding rock,or the construction problem,and does not guarantee the complete fitting of the concrete filled steel tube support and the surrounding rock. Furthermore,the radial stress of the concrete filled steel tube is passively provided by the concrete filled steel tube,which greatly improves the ability of the surrounding rock to bear the load. It provides a theoretical basis for further study of the combined support and reasonable support section of concrete filled steel tube.
In order to further study the interaction relationship between the concrete filled steel tube scaffold and the surrounding rock,this paper records the changes of the stress,deformation and failure of the roadway with the change of the external load by the means of similar physical model,and studies the law of the process. The experiment was first used to simulate the concrete filled steel tube scaffold filled with cement mortar slurry in the aluminum tube,which greatly reduced the relationship between the steel tube and the core concrete. The test shows that,first of all,the support of the concrete filled steel tube support is a passive closed type support form,and the displacement is produced at the first place,and the ratio of the vector span ratio of the 1/4 arc arch decreases and the load and deformation ability of the surrounding rock is reduced.When the displacement occurs after the displacement,the ratio of the 1/4 arc arch is increased. The load and deformability of the surrounding rock increase. The displacement of the first place usually occurs in the direction of the pressure of the weak rock and the surrounding rock,or the construction problem,and does not guarantee the complete fitting of the concrete filled steel tube support and the surrounding rock. Furthermore,the radial stress of the concrete filled steel tube is passively provided by the concrete filled steel tube,which greatly improves the ability of the surrounding rock to bear the load. It provides a theoretical basis for further study of the combined support and reasonable support section of concrete filled steel tube.
引文
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[9]张晓楠,单仁亮,张磊,等.钢管混凝土圆形支架压弯力学性能[J].煤炭学报,2018,43(3):684-693.
[10]刘珂铭.钢管混凝土圆弧拱压弯性能实验与支护应用[D].北京:中国矿业大学(北京),2016.
[11]何晓升.压弯状态下钢管混凝土圆弧拱的工作机理与应用研究[D].北京:中国矿业大学(北京),2016.
[12]李学斌.钢管混凝土支架强度与巷道承压环强化支护理论研究[D].北京:中国矿业大学(北京),2015.
[13]王军.钢管混凝土圆弧拱的抗弯力学性能试验研究与工程应用[D].北京:中国矿业大学(北京),2014.
[14]黄博.采空区下近距离动压巷道矿压特征及支护模拟研究[D].北京:中国矿业大学(北京),2016.
[2]高延法,王波,王军,等.深井软岩巷道钢管混凝土支护结构性能实验及应用[J].岩石力学与工程学报,2010,29(S1):2604-2609.
[3]李学彬,高延法,杨仁树,等.大断面软岩斜井高强度钢管混凝土支架支护技术[J].煤炭学报,2013,38(10):1742-1748.
[4]刘国磊.钢管混凝土支架性能与软岩巷道承压环强化支护理论研究[D].北京:中国矿业大学(北京),2013.
[5]臧德胜,韦潞.钢管混凝土支架的研究和实验室实验[J].建井技术,2001,22(6):25-28.
[6]臧德胜,李安琴.钢管砼支架的工程应用研究[J].岩土工程学报,2001,23(3):342-344.
[7]单仁亮,肖禹航,何晓生,等.钢管混凝土短柱作用机理与塑性极限承载力研究[J].矿业科学学报,2017(6):519-528.
[8]单仁亮,肖禹航,刘珂铭,等.钢管混凝土支架构件-圆弧拱破坏机理研究[J].煤炭学报,2018(7):1918-1929.
[9]张晓楠,单仁亮,张磊,等.钢管混凝土圆形支架压弯力学性能[J].煤炭学报,2018,43(3):684-693.
[10]刘珂铭.钢管混凝土圆弧拱压弯性能实验与支护应用[D].北京:中国矿业大学(北京),2016.
[11]何晓升.压弯状态下钢管混凝土圆弧拱的工作机理与应用研究[D].北京:中国矿业大学(北京),2016.
[12]李学斌.钢管混凝土支架强度与巷道承压环强化支护理论研究[D].北京:中国矿业大学(北京),2015.
[13]王军.钢管混凝土圆弧拱的抗弯力学性能试验研究与工程应用[D].北京:中国矿业大学(北京),2014.
[14]黄博.采空区下近距离动压巷道矿压特征及支护模拟研究[D].北京:中国矿业大学(北京),2016.