深部采空区注浆效果即时检测方法

Instant detection method of grouting effect in deep mine goaf

为了即时检测采空区地基充填治理过程中的注浆效果,动态评判治理质量,以济宁某深部条带采空区治理控制注浆为对象,开展治理过程中注浆效果即时检查方法研究,提出了多系数法定量即时检测注浆效果,结合施工过程中的钻探、注浆数据,给出了4项系数指标的计算方法,并确定了指标量化评价标准。结果表明:后序钻孔注浆量衰减系数s越大,表明采空区注浆目标层段可注性越差,注浆充填效果越好。Ⅱ序孔注浆量衰减系数不宜低于0.3,Ⅲ序孔注浆量衰减系数不宜低于0.9。后序钻孔循环液全漏失高度下行系数l越大,表明采空区地层剩余空隙率越小,注浆充填效果越好。Ⅱ序孔全漏失高度下行系数不宜低于0.15,Ⅲ序孔全漏失高度下行系数不宜低于0.20。各注浆单元注浆量空间分布差异系数c越小,表明存在注浆薄弱区域风险越低,注浆充填效果越好。空间分布差异系数不宜超出±0.15范围。同一次序钻孔注浆量离散系数δ越小,表明注浆过程控制效果越好,注浆充填质量越高。单孔注浆量离散系数不宜超过1.2。工后质量检测验证了多系数指标法的可靠性,多系数指标方法点面结合,各指标检测结果相互验证,准确反映了施工过程中的注浆效果。利用即时分析结果可对注浆施工过程中的注浆工艺及其参数进行动态优化调整,强化注浆施工的过程质量控制,提高注浆治理质量。

In order to obtain the grouting effect and dynamically evaluate the treatment quality in the process of foundation filling treatment of mine goaf,the grouting effect instant inspection method was studied for a deep strip mined out area in Jining,China.The multi-coefficient method was proposed to quantitatively and timely detect the grouting effect.Combined with the drilling and grouting data in the construction process,four coefficient indexes were given,and the index evaluation standard was determined.The results show that the larger the attenuation coefficient s of grouting amount in the later sequence drilling,the worse the injectability of the goaf stratum is,the better the grouting filling effect is.The attenuation coefficient of grouting amount in sequence II should not be lower than 0.3,and that in sequence III should not be lower than 0.9.The larger the downward coefficient l of the total leakage height of circulating fluid in the subsequent drilling holes is,the smaller the residual void ratio of the grouting target layer in goaf is,and the better the grouting filling effect is.The total leakage height downward coefficient of the second sequence drilling should not be less than 0.15,and the downward coefficient of the total leakage height of the third sequence drilling should not be less than 0.20.The smaller the difference coefficient c of grouting amount in each grouting unit,the lower the risk of weak grouting area and the better the grouting filling effect.The coefficient of difference should not exceed±0.15.The smaller the dispersion coefficientδof grouting amount in the same drilling sequence indicates that the better the grouting process control effect and the higher the grouting filling quality.The dispersion coefficient should not exceed 1.2.The reliability of the multi-coefficient index method is verified by the quality inspection after construction.The multi-coefficient index method is combined with each other and the detection results of each index are verified each other,which accurately reflects the grouting effect in the construction process.Using the instant analysis results,the grouting technology and its parameters can be dynamically optimized and adjusted in the process of grouting construction,so as to strengthen the process quality control of grouting construction and improve the quality of grouting treatment.