中文摘要：

采空区危害巨大,目前主要采用注浆充填方式进行处置.水泥-粉煤灰浆液在采空区治理中得到了广泛的应用,但在一些采空区治理工程中,由于缺乏粉煤灰,需要寻找其他低成本的注浆材料.水泥-黄土浆液具有就地取材、工艺简单等优势,是替代水泥-粉煤灰浆液的首选.本文以陕西泾阳、甘肃兰州、山西吕梁黄土为研究对象,通过大量水泥-黄土浆液黏度、结石率、凝结时间、结石体强度等性质的试验,研究了水泥掺量、水固比、黄土类型、水玻璃掺量等因素对水泥-黄土浆液性质及其结石体强度的影响.试验结果表明：随黄土掺量的增加,结石体强度、浆体流动性降低,而凝结时间延长;水泥-黄土浆液结石体早期强度较低,而后期强度增长较大;黄土的地域性分布,造成水泥-黄土浆液性质差异较大,黄土的粒径越粗,结石体的强度越高;与离石黄土浆液相比,马兰黄土浆液性能稳定,强度较高,更适宜于采空区充填注浆;水玻璃的掺入,使浆液黏度增大,结石率提高,凝结时间缩短,强度减小.本研究成果为采空区注浆设计和施工提供了新的思路.

英文摘要：

Coal has been widely mined in China to support the rapidly developing economy. A great number of gob zones have appeared in ahnost all provinces d China, especially some provinces with rich coal resources such as Shanxi province, Shaanxi province and Xinjiang province. Gob is dangerous to construction, especially to highways and high speed railways. At present, grouting filling is the main way to reduce engineering hazards in gob area. Fly ash cement slurry is the most commonly used materials in goaf management. Because of lack of fly ash in some goaf treatment project, it is necessary to look for another low-eost grouting material. Loess cement slurry has the advantages of both simple process and reserves of local material. It is considered to be one of the best alternative grouting materials for grouting filling. The property of loess cement slurry is studied in this paper. Firstly, loess samples are collected in Jingyang city of Shaanxi province, Lanzhou city of Gansu province and Lvliang city of Shanxi province. They are taken as experimental materials. Secondly, a large number of loess cement slurry tests on slurry viscosity, stone rate and consolidation strength are performed. Finally, the factors affecting the characters of loess cement grouting material are discussed. They include cement content, water solid ratio and loess type. Results show that with the increase of loess content, the consolidation strength and the liquidity of slun＇y are reduced, and the setting time is extended. The early consolidation strength of cement loess slurry is low, and the later strength grows larger. The main reason that leads to the difference of loess cement slurry properties lies in regional distribution of loess. The consolidation strength becomes higher as the average grain size becomes coarser. Compared with the Lishi loess slun＇y, Malan loess slurry performance is stable and intensity is higher. For this reason, Malan loess is more suitable for grouting filling. With the inerea.se percentage of sodium silicate, t