温度对树脂锚杆锚固性能力学特性影响研究

发布时间：2018-03-29 15:23

  本文选题：树脂锚杆　切入点：水泥-泥岩混合试件　出处：《安徽理工大学》2017年硕士论文

【摘要】：树脂锚杆支护作为煤矿巷道主要支护方式,随着开采的不断推进,受深部矿井中复杂的地质条件、施工工艺及锚杆锚固材料等因素的影响,巷道中树脂锚杆支护问题频现。为进一步了解锚杆锚固机理,分析不同影响因素对树脂锚杆锚固性能影响及锚固界面剪应力分布规律。本文首先采用理论研究方法简单分析锚杆锚固机理,然后由室内试验着重研究了不同温度对树脂锚杆锚固性能力学特性影响,最后利用数值模拟FLAC3D模拟了不同温度环境下锚杆锚固力学行为。主要的研究成果有几个方面:(1)通过力学试验获取千米深矿井泥岩相关力学参数,然后配比不同比例的水泥-泥岩混合试件并对其力学参数进行试验测定。试验结果发现:水灰比为1:4,当水泥和泥岩的混合比例接近1:1时,混和试件的力学性质和原岩最为接近。(2)按照泥岩和水泥确定的混合比例,制作锚杆锚固混合试件模型。在不同温度下对试件单轴压缩试验结果发现:在25℃～60℃温度区间内,锚固体强度随温度升高而衰减的速率约为0.74MPa/℃;锚固体的强度在25℃左右时最大,随着温度的升高,锚固体的强度越来越小,当温度达到45℃左右时,锚固体强度衰减的速率变快,出现一定程度的软化变形,当温度达到60℃时,锚固体的强度只有25℃下的60%左右。(3)对不同温度下锚固试件单轴压缩试验锚杆杆体上应变片数据处理分析:锚杆锚固界面上的剪应力非均匀的分布在杆体轴向方向上,常温状态下,锚固界面上剪应力在锚固压缩端处较小,随着距压缩端距离的增加剪应力值增大,在靠近锚固端远端达到峰值,之后锚杆剪应力迅速减小,剪应力分布特点为单峰值曲线,随着温度的升高,剪应力曲线峰值点沿锚杆轴线方向向荷载端转移。锚杆在钻孔中的位置也会影响锚杆两侧剪应力的分布。(4)运用数值模拟FLAC3D软件建立模型,分析了不同温度环境相同加载荷载下下锚固体塑性区、锚固剂塑性区的分布特点以及锚杆轴向应力、水平应力的变化规律。
[Abstract]:As the main support method of coal mine roadway, resin bolt support is influenced by complicated geological conditions, construction technology and anchor material in deep mine with the development of mining. The problem of resin bolt support in roadway is frequent. In order to further understand the anchoring mechanism of bolt, The influence of different factors on the anchoring performance of resin bolt and the distribution of shear stress at the Anchorage interface are analyzed. Then, the effect of different temperature on the mechanical properties of resin anchor rod is studied in laboratory. Finally, numerical simulation FLAC3D is used to simulate the mechanical behavior of anchor bolt under different temperature environment. The main research results include several aspects: 1) the mechanical parameters related to mudstone in a mine with a depth of 1 km are obtained through mechanical tests. Then the mixed specimens with different ratio of cement and mudstone were tested and their mechanical parameters were measured. The results showed that the ratio of water to cement was 1: 4, when the ratio of cement to mudstone was close to 1:1, The mechanical properties of the mixed specimen are closest to the original rock. (2) according to the mixing ratio determined by mudstone and cement, the model of anchor bolt anchoring mixed specimen is made. The results of uniaxial compression test of the specimen at different temperatures show that: in the temperature range of 25 鈩，

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