【作者】 张道勇；

【导师】 左文贵；

【作者基本信息】 中南大学 ， 地质工程， 2010， 硕士

【摘要】 石膏是一种用途广泛的工业和建筑材料,一般赋存于地下。由于其存在经济价值,所以被大量开采,从而形成采空区。目前由采空区引发的一系列地质灾害问题日益暴露出来,因此有必要对石膏矿采空区进行稳定性分析和治理技术研究。本文以邵东县龙凤机械厂附近的石膏矿采空区为例进行分析研究,首先通过勘探和调查了解采空区的基本情况,再对采空区进行稳定性分析和充填治理研究,所做的工作和取得的成果有：1、在实地调查和勘探的基础上,利用FLAC3D有限差分法对采空区进行沉陷模拟,利用模拟计算结果从采空区顶板稳定性、矿柱稳定性、地表变形三个方面对采空区进行稳定性评价,并与实际调查结果对比,得出采空区是不稳定的。2、通过对比几种治理方法的优劣和阐述充填作用的机理,决定采用粘土固化充填的方法来治理采空区。充填治理的关键是确定固化剂和合理的充填配比。对充填材料进行单一固化剂配方试验和复合固化剂配方均匀设计试验,并对试验结果进行分析。在此基础上确定该采空区充填应当采用复合固化剂,复合固化剂由水泥、石膏和水玻璃组成。3、充填治理工艺分为自流充填和泵送注浆接顶充填,不同的充填工艺对浆液流动性要求不一样,一般通过塌落度来评价浆液的流动性。通过开展料浆自流充填和泵送注浆接顶充填最佳配比试验,并利用混沌优化与神经网络对试验结果进行分析得出最优配比。通过实践证明,粘土固化充填该采空区所采用的配比效果好,达到了良好的经济效益。更多还原

【Abstract】 Gypsum is a kinds of material which used to building and industry widely, and stores underground. It is mined largely because of its economic value, and then much goaf formed.Now a series of problem about geologic hazard emerged because of those goaf. Therefore, it is necessary to analysis its stability and research filling management technology.This paper take the goaf nearby Longfeng machinery factory for example. Through survey and exploration, the fundamental state is known. And then its stability and filling management technology are reached. the main works in this paper as follows:At first,based on survey at Shaodong gypsum mine, FLAC3D is used to simulate its mining subsidence.and the conclusion is used to evaluate the stability of the goaf from three aspects,which are the stability of mine roof and mine prop,ground deformation. On the basisi of comparison between conclusion of simulation and conclusion of survey,a conclusion that goaf is unstable can be drew.Secondly,Through comparative analyses several kinds of management method,the method of clay-hardening grouts could be used to manage the goaf. The key of filling management is determining curing agent and reasonable proportioning. Therfore single curing agent proportioning experimentation and composite curing agent uniform design experimentation are carried out,and the reslut is analysed. Based on these result,composite curing agent that comprises cement, gypsum and water-glass could be used to fill the goaf.Finally fining method can be divided into gravity feed and pump roof-contacted filling. Liquidity of fluid is evaluated by slump,because of different method need different liquidity.the optimal proportioning experiment of gravity feed and pump roof-contacted filling are carried out. These result is ansisied by neural network model and chaos optimization and to obtain the optimal proportion.Practice test that the optimal proportion of clay-hardening grouts for this goaf achieves good effect and economic benefit.更多还原