基于空间相关性不同组构干热岩裂隙发育

基于以往对干热岩开发的研究，不难发现其主要赋存介质为花岗岩，而此类岩石的组构分布与裂隙发育关系对其开采能效有较大影响。鉴于此，针对花岗岩组构分布与裂隙发育规律的考虑。利用空间相关性函数构建出不同组构的花岗岩表面图像，然后利用离散元数值软件针对图像组构进行建模，结合多种室内试验对数值模型参数进行校准，并进行抗拉强度试验，将裂隙发育情况采用分形维数对进行分析。结果表明：(1)空间相关函数随机场随着其参数的变化能够有效表征岩石内部组构变化情况；(2)随着花岗岩试件组构分布的变化，试件的强度也随之变化；(3)裂隙发育的分形结果表明，矿物组构的不同导致破坏过程中破裂点数目和破裂点发育状态不同，从而对试件的强度产生影响。进而影响干热岩开发的工艺和热交换效率。

Study on fracture development of dry hot rock with different fabric based on spatial correlation

Based on previous research on dry-hot rock development, it is not difficult to find that the main hosting medium is granite, and the relationship between fabric distribution and fracture development of such rock has a great influence on its mining energy efficiency. In view of this, consideration is given to the distribution of granite fabric and the law of fracture development. The surface images of granite with different fabrics are constructed by using spatial correlation function, then the image fabrics are modeled by discrete element numerical software, the parameters of the numerical model are calibrated by combining various indoor tests, and the tensile strength test is carried out, and the fracture development is analyzed by fractal dimension. The results show that: (1) the random field of spatial correlation function can effectively characterize the change of fabric in rock with its parameters; (2) The strength of granite specimens varies with the change of their fabric distribution; (3) Fractal results of fracture development indicate that different mineral fabrics result in different number of fracture points and different development states of fracture points during the failure process, thus affecting the strength of specimens. The process and heat exchange efficiency of dry-hot rock development are further affected.