摘要
20a前在抚顺老虎台煤矿512采区进行的我国首例离层注浆减沉试验为探索煤矿可持续开采技术提供了宝贵经验。试验采区地表下沉比预计小的真正原因是采空区密实水砂充填（充满率为70％-85％），覆岩中巨厚绿色页岩层遇水碎胀（碎胀率为185％）和大采深极不充分采动（采动程度系数为0．14）。离层注浆主要起到了使绿色页岩层碎胀的作用，而留在覆岩离层中的粉煤灰量极少（只占煤炭采出体积的3％）难以起到减沉作用。试验结果说明该技术在缓沉方面比减沉更有效。
The first subsidence reducing test of injecting grouts into separated beds of 512 mining area in Laohutai Coal Mine in Fushun was carried out 20 years ago, has provided valuable experience for exploiting the sustainable mining technology of coal mines. The real reason why surface subsidence of mining area is smaller than expected is the filling of water and sand in the empty mining area （full filling rate is 70%-85%）, the bloating and breaking of green shale rock stratum in the overlying disrupted strata when encountering water, （rate of bloating and breaking is 185% ）, and not sufficient excavation in deep stratum （extraction degree is 0.14）.The injecting grout into separated beds plays an important role in making the green shale rock stratum bloat and break, whereas the small amount of flyash is in the overlying disrupted strata（accounting for 3 % of the volume of mining coal）, which can＇t reduce subsidence. The result of the test proveed that this technology is effective in reducing the subsidence, rather than slowing down the subsidence.
出处
《中国地质灾害与防治学报》
CSCD
2006年第1期102-104,123,共4页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金资助重点项目(50434020)
关键词
采动覆岩
离层注浆
减沉试验
overlying disrupted strata by extraction
injecting grout into separated beds
reducing subsidence test
