多场耦合作用对钙芒硝矿原位溶浸开采增效影响机理

项目名称： 多场耦合作用对钙芒硝矿原位溶浸开采增效影响机理

项目编号： No.51504158

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 于艳梅

作者单位： 太原理工大学

项目金额： 22万元

中文摘要： 钙芒硝是一类地质体中常见的可溶性岩石，采用溶浸法进行地下矿产资源的开采，将会引起岩体内部的物理结构改变，内部结构的变化又会引起岩石力学性能及渗透性的改变，从而影响钙芒硝矿原位溶浸开采效率。. 本项目通过理论分析、试验研究的方法，围绕THMC耦合作用下钙芒硝内部结构演化以及其溶解渗透特性等问题进行研究。对不同长度裂纹数量及裂纹密度等物理特征参数进行统计分析，统计钙芒硝的孔隙率、孔隙尺度、孔隙比表面积的变化规律。分析优势通道的形成机理以及不同尺度裂隙组合网络溶解-渗透特性，进而揭示原位溶浸开采增效机理。探讨快速提高钙芒硝矿原位溶浸开采效率的技术方案。

中文关键词： 钙芒硝；原位溶浸开采；溶采效率；多场耦合；孔裂隙

英文摘要： Glauberite is a kind of soluble rock. In fact, glauberite in-situ solution mining is a process of solid deformation distortion, fluid migration and multi-field coupling of mineral dissolution. So the study on theory of glauberite’s solution mining is of great significance on the technology of solution mining. Glauberite dissolution will cause its internal structure change, which will result in the change of the permeability. Thus the in-situ solution mining efficiency can be influenced. . Focusing on internal structure evolution of glauberite under synthetical coupling reaction as heat, water, mechanics and chemistry and dissolution permeability, this context makes a number of theory analysis and experimental investigation. Different crack length and density will be analyzed. In order to analyze the glauberite internal structure under THMC coupling effects from microscopic view, this study makes a comprehensive analyze on CT scan two-dimensional pictures by experiments. At the same time, a statistics will be made on the porosity, pore size, and changing laws about the specific surface area of pores in glauberite microstructure. Then forming mechanism of the preferential pathway and the solution-pervasion are analyzed. So the synergistic mechanism of in-situ solution mining will be revealed. Finally the technical scheme of improving the solution mining efficiency is approached.

英文关键词： glauberite;In-situ solution mining;the efficiency of solution mining ;the coupling multi-field;pores and fissures