【作者】 徐志鹏；

【导师】 周兴旺； 高岗荣；

【作者基本信息】 煤炭科学研究总院 ， 岩土工程， 2009， 硕士

【摘要】 随着煤炭开采深度加大,井筒越来越深,井筒注浆深度越来越大,工程地质水文条件也越来越复杂,注浆的主要对象之一是含水裂隙。对深井含水裂隙注浆问题开展研究有着重要意义。为推动煤矿千米级(850m～1200m)深井裂隙注浆研究,依托国家“十一五”科技支撑计划课题(NO.2008BAB33B02)和煤矿深井建设技术国家工程实验室建设项目,基于单向单裂隙模型,本文研制了耐压高、密封好、功能丰富的高压裂隙注浆试验台,通过组建自动监测系统实现了压力等参数的自动监测。新研制的高压裂隙注浆试验台具有以下性能:(1)试验台耐压高、密封好:最高可耐压36MPa,满足埋深千米级深井裂隙注浆模拟试验研究;(2)受注裂隙模型单向长度以及隙宽均可调可控;(3)考虑了地下水影响,可以检测浆液扩散距离及裂隙充填情况。为了解刚研制的塑性早强浆材的注浆特性,推动其早日投入工程应用,本文利用新研制的高压裂隙注浆试验台,首次对这种浆材进行了在含高压水大裂隙中的注浆模拟试验初步研究。通过试验首次获得了这种浆材在大裂隙中的一些注浆性能:(1)注浆压力P随时间t的变化规律即P-t曲线总体上可分为三种类型:平缓型、平—升—降—平—升型、平—升型;(2)平缓型P-t曲线对应的注浆效果稍差;平—升—降—平—升型、平—升型两种P-t曲线对应的注浆堵水效果比较理想;试验研究表明,塑性早强浆材具有明显的速凝、早强特性,能够满足深井大裂隙地层注浆的需要。更多还原

【Abstract】 The grouting quality become more and more difficult to be controlled as the depth of pregrouting is increasing, and the engineering geological condition become more and more complicated, especially in the rock stratum with wide fissures in deep shaft.This paper based on imbursement of the "11th Five Years Key Programs for Science and Technology Development of China"(NO. 2008BAB33B02) and National Engineering Laboratory Research on Coal Mine Shaft Construction Technologies, successfully developped a model tester for grouting simulation in rock fissure,which can work safely under high pressure. Firstly, based on the analysis of the grout flowing in rock fissure, a single fissure model of parallel plates was established; in order to meet study of grouting simulation in rock fissures of deep stratum, a fissure model which can work safely under high-pressure was successfully developed; an automatic monitoring system for grouting was set up, and some test data such as grouting pressure could be record automatically. The new tester have a lot of advantages as following:(1) It has the characteristics of bearing high pressure and sealing tightly, whose maximum working pressure is 36MPa. It can simulate the grouting in rock fissure with in 850m～1200m depth.(2) It is adjustable about the length and width of the fissure model;(3) Considered about the influence of underground water, it could detect the dispersal distance and filling of the fissure.In order to accelerate the application of the plastic and early-strength grout, making use of new model tester, the author completed some research work on grouting simulation in rock fissures under high water pressure for the grout. By the results of simulating experiment, some grouting laws in rock fissure under high water pressure have been discovered as following aspects:(1) There are three kinds of change curves of the rule of grouting pressure P with the grouting time t: gently, gently-ascending-decline- gently-ascending, and gently-ascending.(2) The grouting effect of the former kind P-t curve is not perfect, and the grouting quality of the latter two kinds of the P-t curves are very good, which could resist against the high underground water pressure in 1200m depth stratums;Based on the study of grouting simulation, it was proved that the plastic and early-strength grout is one kind of good grout with many advantages, especially for rock mass fissures grouting engineering in deep shaft.更多还原