水泥基复合材料带压注浆封孔测压技术研究

发布时间：2018-05-09 21:53

本文选题：瓦斯压力测定 + 钻孔密封　；参考：《河南理工大学》2015年博士论文

【摘要】：造成瓦斯压力测定成功率较低除了人为因素等原因之外,其中一个重要的原因就是测压封孔不严密,目前封孔存在的主要问题有:封孔的起始位置选择不合理、封孔长度难以确定、封孔工艺和注浆压力不合理、封孔材料不适用,难以封堵巷道周围煤岩体的裂隙等。本文通过对与煤层瓦斯压力测定中封孔质量密切相关的巷道周围煤岩体应力应变及蠕变效应、封孔注浆材料、封孔起始位置、封孔长度和注浆压力进行理论、数值模拟计算、实验室实验以及现场工程应用检验等方面的研究。取得了以下主要成果:(1)对巷道周围岩体物理力学特性进行研究,之后进行了巷道周边应力应变以及塑性区的数值模拟,同时对成庄煤矿煤巷的蠕变效应进行研究,得出了巷道蠕变效应对钻孔密封性的影响,找出了合理的封孔起始位置(钻孔孔口向里6.8m以上)和合理的封孔长度(11m),为达到改善封孔效果,准确测定煤层瓦斯压力奠定了理论基础。得出了埋深越深、巷道断面越大,蠕变效应对巷道的影响越大,弹塑性区的范围也就越大,因而在封孔时必须考虑埋深和巷道断面因素对封孔起始位置和封孔长度的影响。(2)对钻孔周边应力应变进行了数值模拟研究,得出了钻孔周边应力应变及塑性区模型。封孔距离较短时时,选择球形注浆理论,封孔距离较长时,选择柱面注浆理论,本文采用柱面注浆理论进行注浆研究,并建立了钻孔注浆模型。(3)加入了复配早强剂与缓凝剂改性后,超细硫铝酸盐注浆材料性能有了很大的提高,优化选取早强改性剂、流动性改性剂和煤体表面浸润性改善剂的配比,使得掺加了多种外加剂的硫铝酸盐注浆材料可以保证注浆材料注入煤体后能够以较快的速度反应凝结,同时产生较强的抗压强度以及在注入煤体前具有良好的流动性,同时超细化以后注浆材料对于微裂隙的充填也有很好的效果,且凝固后体积也并未出现收缩。(4)通过对成庄矿的现场本煤层钻孔测压真实情况进行数值模拟和实测验证,研究了巷道蠕变效应对钻孔封孔起始位置以及封孔段长度的影响。采用了注改性后的硫铝酸盐水泥基注浆材料进行现场注浆封孔试验,试验结果表明:改性后的超细硫铝酸盐水泥基注浆材料可以对煤壁裂隙进行扩散充填,且填充效果良好。采用数值模拟确定了合理的注浆压力5MPa。采用“两堵一注”封孔方式压注改性后的硫铝酸盐水泥基注浆材料的封孔技术进行压力测定的结果为0.24MPa-0.63MPa,对比先前矿上测得的相对瓦斯压力值不到0.1MPa提高了2-6倍,实测的煤层瓦斯压力值与根据实测瓦斯含量间接计算得到的煤层瓦斯压力吻合度高,相对误差2.04%-10.71%,平均为5.85%。
[Abstract]:The success rate of gas pressure measurement is low except for human factors. One of the important reasons is the tight seal hole. The main problems of sealing hole are: the selection of the opening position of the sealing hole is unreasonable, the length of sealing hole is difficult to be determined, the sealing process and grouting pressure are not reasonable, the sealing material is not applicable and it is difficult to block the sealing material. In this paper, the stress strain and creep effect of coal and rock mass surrounding the roadway, the sealing hole grouting material, the opening position, the length of sealing hole and the grouting pressure, which are closely related to the sealing quality of the coal seam gas pressure are closely related to the coal and rock mass of the coal seam, in this paper, the numerical simulation calculation, the laboratory experiment and the field engineering application inspection are carried out. The following main achievements are obtained: (1) the physical and mechanical properties of the rock mass around the roadway are studied, and the stress and strain around the tunnel and the numerical simulation of the plastic zone are carried out. At the same time, the creep effect of the coal roadway in the Cheng Zhuang coal mine is studied, and the effect of the creep effect of the roadway on the sealing property of the borehole is obtained, and the rationality is found out. In order to improve the sealing effect and accurately determine the coal seam gas pressure, the starting position of the sealing hole (the hole opening above 6.8m) and the reasonable sealing length (11m) laid a theoretical foundation for the accurate measurement of the coal seam gas pressure. The deeper the depth of the buried depth, the greater the roadway section, the greater the influence of the creep effect to the roadway, the greater the scope of the elastoplastic zone, so it must be sealed in the sealing hole. The influence of the depth of buried depth and the tunnel section on the opening position and the length of the sealing hole is considered. (2) the stress strain around the borehole is numerically simulated, and the stress strain and the plastic zone model around the borehole are obtained. When the sealing distance is short, the theory of spherical grouting is selected and the cylinder grouting theory is selected when the sealing distance is long. This paper adopts the theory of cylinder grouting. The grouting theory of cylinder grouting is studied and the drilling grouting model has been established. (3) after the modification of the compound early strong agent and retarder, the performance of the superfine sulphoaluminate grouting material has been greatly improved, the early strength modifier is selected, the mixture ratio of the fluidity modifier and the surface wetting agent of the coal body is added, which makes the addition of a variety of admixtures. The sulphoaluminate grouting material can ensure that the grouting material can be condensed at a faster rate after injection of the coal into the coal body, at the same time, it produces strong compressive strength and has good fluidity before the injection of coal. At the same time, the grouting material has a good effect on the filling of the micro fissure after super refining, and the volume does not appear after the solidification. (4) the effect of the creep effect on the opening position of the borehole and the length of the sealing section was studied through the numerical simulation and test verification of the real situation of the borehole pressure measurement in the site of the site of Cheng Zhuang coal mine. The test results showed that the modified sulphur aluminate saline mud base grouting material was used for field grouting sealing test. The test results showed that the modification was modified. The later superfine sulphoaluminate mud base grouting material can spread and fill the crack of the coal wall, and the filling effect is good. The numerical simulation is used to determine the reasonable grouting pressure 5MPa. using "two plugging one injection" sealing method to press the Modified Sulphoaluminate mud base grouting material. The result of pressure determination is 0.24MPa. -0.63MPa, the relative gas pressure measured by the previous ore is 2-6 times higher than that of 0.1MPa. The measured coal seam gas pressure is in good agreement with the coal seam gas pressure calculated indirectly by the measured gas content, and the relative error is 2.04%-10.71%, the average is 5.85%.

【学位授予单位】：河南理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TD712.3

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