黏度时变性灌浆材料加固碎裂岩体应用研究

摘要

The ordinary cement slurry has long setting time , low early strength, and poor groutability.It is difficult to guarantee quality in the complex rock grouting .It proposes the ordinary cement slurry as the base mud slurry , and it put admixture in the ordinary cement slurry admixture to adjust the cement hydration and hardening process , which forms the SJP grouting material of variable viscosity in time .The slurry has good initial liquidity and initial low viscosity.The viscosity of the slurry can increase rapidly after the pump time , the size of the pump can be maintained in good time, the slurry setting time can be controlled to the initial setting time .The pump can pump over short time interval, which can reduce slurry erosion.The slurry consolidation has fast growth of early strength and high strength characteristics late.It changes the amount of an admixture , which can be formed with the formation of adaptable grouting material depending on the characteristics of rock formation .The application results show that for steep, wide joints and broken rock grouting, the grouting material variability has good suitability of SJP viscosity.The SJP viscosity can be used as anchor grouting material .It reduces the amount of material at the same time and can save cost and working hours .The perfusion quality meets the design requirements .Meanwhile the SJP grouting material also can be used in dam reinforcement , building foundation treatment, and geological disaster control engineering applications.%针对普通水泥浆流动时间长、早期强度低、可灌性差，在复杂岩体注浆中质量难以保证的问题，提出以普通水泥浆为基浆，对普通水泥浆适当掺加外掺剂进行改良，以调节水泥水化及硬化进程，形成 SJP 黏度时变性灌浆材料。其特征主要为浆液初始流动性好，浆液黏度增长缓慢，浆液过可泵时间后其黏度将迅速增大，浆液在可泵时间内保持良好的可灌性；浆液流动时间可控，可泵时间到初凝时间间隔短，浆液不易被冲蚀；同时浆液固结体具有前期强度增长快，后期强度高的特点；可以根据不同岩层特点，改变外掺剂的加入量，可以形成与地层良好适应性的灌浆材料。应用结果表明：对于陡倾、宽缝、碎裂岩体， SJP 黏度时变性灌浆材料具有良好适宜性，可以作为锚杆灌浆材料，在减少材料用量的同时，可缩短工时，灌注质量满足设计要求。 SJP 灌浆材料已应用到坝基加固、房屋地基处理、地质灾害治理工程中。