摘要：A new composite two component grout comprised of modified urea-formaldehyde resin and cement was formulated to take account of the advantages and disadvantages of both the cement grout and the chemical *** new grout is designed for water blocking by reinforcing as well as seepage control by bore *** A component consists of a modified urea-formaldehyde resin A component,some cement,and some *** B component is an alkaline *** orthogonal test of four factors at three levels showed that gel time increased with increased water content and with urea-formaldehyde resin *** time decreased at increased levels of alkaline *** A component of this new composite grout is stable over time.A mixed cross-over test showed that as the volume ratio of A to B increases the gel time falls at first but then *** solid strength decreases with increasing levels of the B *** solid strength increases over time and becomes stable by the 28th day after *** viscosity increases with increasing levels of resin A *** increase is exponential and may be fit to:l = 8.162e0.0286x.

摘要：针对某矿煤层埋藏深,受底板承压水威胁严重的问题,确定底板采动破坏的深度是实现对其深部开采的关键和前提。根据该矿1305工作面的水文地质条件、煤层力学性质以及顶底板岩层结构和性质,运用FLAC3D数值模拟方法研究煤矿深部开采过程中应力分布与塑性区分布特征,结合现场实测数据及煤层不同深度的超前段底板超声图像观测规律,得出该工作面采动煤层底板变形破坏的深度约为22 m。

摘要：根据某煤矿1304工作面煤层顶底板岩层组合及结构性质特点,建立反映完整顶板岩层组合的工程地质模型,通过FLAC3D数值模拟分析了煤层开采过程中顶板应力及塑性区分布特征,得出采动煤层顶板冒裂带高度为64 m。并采用类比法分析所得冒裂带高度,综合对比分析得出1304工作面顶板冒裂带高度为34.6～77.5 m。

摘要：针对合成氨装置循环水系统水泵运行效率偏低、系统换热分配不均、换热器缺乏定量调整手段等问题,分析了产生原因、制约因素和技术保障,提出了优化改造措施:重新设计更换高效叶轮、合理化级配、优化水量分布、回水富余能量利用等。通过系统优化改造后,循环水泵运行节能率达到17%左右,同时冷却塔冷却效果大幅度提升,管网流阻减小,系统压差增大,运行更加安全稳定。