中空注浆锚索技术在软岩高地应力巷道的应用

针对清水营煤矿软岩巷道围岩失稳变形严重现象,本文主要对失稳原因进行分析总结,提出以中空注浆锚索补强加固为主的支护方案。文章介绍了中空注浆锚索支护原理,进行了中空注浆锚索支护试验,发现巷道顶板和帮的位移变形明显减小,变形量得到有效控制,减小了围岩的松动不稳定范围提高了巷道的持续承载能力和稳定性取得了良好的支护效果。     

用压力注浆法提高钻孔灌注桩施工质量

本文讨论了钻孔灌注桩施工质量缺陷及成因 ,提出了一些改善钻孔灌注桩施工工艺 ,特别详细介绍了在福建移动通信大厦中采用的后压浆工艺 ,有效地控制并提高了成桩质量     

混凝土结构构件加固施工技术

本文介绍了混凝土结构构件的几种加固补强技术,简要阐述了裂缝灌浆、植筋、碳纤维布粘贴及粘钢的施工方法与要点。     

有机硅改性糠醛丙酮环氧灌浆材料合成与性能

采用氨基硅油与双酚A型环氧树脂反应 ,并以此制备了一种新型糠醛丙酮环氧灌浆材料。研究了不同氨基硅油含量对改性环氧灌浆材料固结物力学性能的影响 ,确定了合成条件 ,并用热重法对改性树脂的耐热性进行了表征。结果表明 ,所制备的糠醛丙酮环氧灌浆材料的韧性和耐热性都有明显的提高。     

Theoretical and experimental study on the rheological properties of WIS grout and the dispersion and sealing mechanism

Recently a new grout material called water inflow sealing (WIS) was invented for sealing water inflow in tunneling and underground constructions. In this study, a special experimental method called intubated counter grouting (ICG) was proposed to investigate the influence of water dispersion on the rheological properties of the grout during the grouting process, and to testify the sealing performance of the grout, such as instant gelling ability (IGA) and anti-dispersion ability (ADA). In the experiment, dispersion was restricted in the downstream of the channel with a high turbulence intensity. The influences of ADA and IGA were therefore decoupled and evaluated separately. Experimental results revealed two distinctive sealing mechanisms of WIS. For a low initial velocity of water, WIS turned the shear flow of water into an overall movement of a plug by absorbing water into the particles. For a high initial velocity and the situation that the particles reached the outlet before sufficiently expanding, WIS modified the rheology of the water in the channel and reduced its velocity till the static state. The distinctive feature of WIS brings a reformation on the sealing mechanism and provides an effective way to control water inflow with high pressure and velocity.     

低粘度高强度有弹改性环氧树脂化学灌浆材料的应用

介绍了低粘度高强度有弹改性环氧树脂化学灌浆材料在三个现场施工中成功的应用实例和材料的性能及施工工艺。     

基于桩土共同作用下的注浆微型桩设计计算

将桩土复合体视为一个整体,简化为连续中厚档板,滑动面以上为弹性板,滑动面以下为刚性板,利用等效刚度原则求到桩土复合体的等效刚度,采用滑动面处位移相等原则,保证桩身在滑动面处的内力和变形位移的连续性以及反应土体的连续性,使计算结果更符合微型桩群的实际受力情况。板的计算参数取用岩土体计算参数,进而计算出桩体的变形位移及内力。通过实例求解得到桩土复合体的位移及内力图,与数值计算方法和悬臂桩法计算所得变形位移及内力图变化趋势相同,且变形位移和内力的计算结果偏大,为桩土破坏提供了一定的安全储备空间。     

Super-absorbent swellable polymer as grouting material for treatment of karst water inrush

Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water inrush. To address these deficiencies, a new type of polymer grouting material with an excellent expansion ratio was synthesised. The material quickly absorbs water and has an expansion ratio of 1:300. The material is composed of a superabsorbent polymer(SAP), glycerol, and ethanol. The effects of water quality on the expansion ratio and expansion rate of the material were examined, and the best solid–liquid ratio for the slurry was determined by fluidity measurements. A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline, demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other materials. This study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters, ensuring the safety of construction sites and preventing loss of life and damage to property.     

压力注浆法在莱钢办公楼加固工程中的应用

由于地基沉降,某办公楼出现大面积沉降。通过方案比较,决定采用压力注浆法对地基进行加固,对由于沉降而破坏的部位进行加固修复,并取得显著效果。     

有粘结预应力混凝土平板施工技术

结合具体工程实例,介绍了有粘结预应力混凝土平板的施工技术,提出了施工质量控制措施,得出了施工效果较好的结论。．