裂隙软岩巷道渗水弱化机理及稳定性控制研究

发布时间：2018-06-13 03:20

本文选题：渗水砂岩 + 微细观形态　；参考：《山东科技大学》2017年硕士论文

【摘要】：在各类煤矿软岩巷道中,层理、节理、裂隙发育的岩体常伴随着大量的地下水存在,而地下水的作用会促使岩层发生严重弱化,这种弱化作用在巷道及各个车场的建设过程中,常会引起冒顶等严重事故。因此,研究这种裂隙发育且伴随地下水存在的软岩巷道的破坏机理、支护方法、支护形式及支护参数,从而找到适用于这类不稳定巷道的开挖、支护、加固、修复等方面的新技术,是十分有意义的。本文围绕着细微观形态下渗水砂岩的矿物组成成分、微观结构形态、水物理化学作用的破坏机理及其定量表达、巷道的渗水情况评价、顶板分类、围岩稳定性影响因素以及渗水巷道的弹塑性理论分析进行展开,其研究内容和主要结论可归结为以下几点:(1)组成砂岩、粉细质砂岩和泥岩的成分中,含有多种粘土性矿物,这些矿物有着复杂的微观结构,这是导致巷道被破坏的内因;岩体与地下水接触,会发生一系列的物理化学作用,这是导致巷道被破坏的外因。(2)工程中,应根据巷道顶板的岩层情况和顶板之上含水层的情况将渗水巷道分为两类,并应根据此分类对巷道的稳定性和涌水情况进行评价,而不应再使用传统的以富水系数或矿井涌水量为核心评价方法;而影响巷道稳定的因素包括:软弱层的情况、老顶含水砂岩的情况和先期的支护方案等。(3)对圆形截面深部渗水砂岩巷道在支护体施加前后的弹塑性区应力以及位移情况进行了推导;将水对岩体造成的损伤量,用一个以岩石孔隙度为函数的张量式Dij进行表达。(4)结合彭庄煤矿几处巷道的工程实例,并使用数值模拟的方法,对两类典型的渗水砂岩巷道的支护方法进行了探讨,找到了与其对应的有效支护方案。
[Abstract]:In all kinds of soft rock roadway of coal mine, the rock mass with stratification, joint and fissure is often accompanied by a large amount of underground water, and the action of groundwater will make the rock stratum weaken seriously, and this kind of weakening effect will occur in the construction process of the roadway and each vehicle yard. Serious accidents such as roof fall are often caused. Therefore, the failure mechanism, support method, support form and support parameters of soft rock roadway with developed fissure and groundwater are studied, so as to find out suitable excavation, support and reinforcement for this kind of unstable roadway. The new technology of repair and so on, is very meaningful. In this paper, the mineral composition, microstructure, destruction mechanism and quantitative expression of water physicochemical action, water seepage evaluation of roadway, roof classification, etc. The factors affecting the stability of surrounding rock and the elastic-plastic theory analysis of water-permeable roadway are carried out. The research contents and main conclusions can be summed up as follows: 1) the sandstone is composed of fine silty sandstone and mudstone, and there are many clay minerals in the composition of silty sandstone and mudstone. These minerals have complex microstructures, which are the internal cause of roadway destruction; a series of physicochemical processes occur when rock mass is in contact with groundwater, which is the external cause of roadway destruction. Seepage roadways should be divided into two categories according to the rock strata of the roadway roof and the aquifer above the roof, and the stability and water inflow of the roadway should be evaluated on the basis of this classification, Instead of using the traditional evaluation method based on water enrichment coefficient or mine water discharge, the factors affecting roadway stability include the situation of weak layer, The stress and displacement in elastic-plastic zone of deep water-permeated sandstone roadway with circular section before and after applied by supporting body are deduced, and the damage amount caused by water to rock mass is given. In this paper, a Zhang Liang type dij with rock porosity as its function is used to express. The supporting methods of two typical water-permeable sandstone roadways are discussed by combining with engineering examples of several roadways in Pengzhuang Coal Mine and using numerical simulation method. The corresponding effective support scheme is found.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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