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在大坝岩石基础裂隙灌浆中,水泥颗粒直径要小于裂隙宽度的1/3,才能进行有效的灌注,裂隙宽度越小,要求的灌浆颗粒材料也越小。在基础灌浆中,有时遇到岩石的微细裂隙或断层,出现吸不进水泥颗粒的“失水回浓”现象。当前国内灌浆工作者解决这个问题的办法多是化学材料灌注,一般可以收到预期效果,但却大大增加了工程造价,且存在化学材料对环境的污染和化学材料本身的老化,以及对灌浆操作人员的健康影响等问题,如果用超细的颗粒材料,如磨细水泥或超细水泥加膨润土,并采用相应的施工设备和工艺,可使用微细裂隙的灌浆处理得到解决或部分得到解决、这样可扩大水泥对裂隙的可灌性范围,降低工程造价和化学材料灌浆存在的其它问题
In the dam foundation rock grouting, the diameter of the cement particles should be less than 1/3 of the width of the fractures for effective perfusion. The smaller the fracture width, the smaller the required grouting material. Grouting in the foundation, and sometimes met the fine cracks or fractures of the rock, there is not absorbed into the cement particles “dehydration back to thick” phenomenon. The current domestic grouting workers to solve this problem mostly chemical material perfusion, the general can receive the desired results, but it has greatly increased the cost of the project, and the existence of chemical materials pollution of the environment and chemical materials themselves aging, as well as the grouting operation Personnel health effects and other issues, if the use of ultrafine particulate materials, such as ground cement or ultrafine cement plus bentonite, and the use of appropriate construction equipment and processes, the use of fine cracks Grouting treatment can be solved or partially resolved, so Can expand the range of cement fissure irrigation can reduce the project cost and other problems of chemical material grouting