基于刚体弹簧–等效离散裂隙网络耦合方法的水压致裂数值模型

doi:10.13722/j.cnki.jrme.2017.1231

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Abstract An equivalent discrete fracture network model to simulate two-dimensional unsteady seepage process is proposed. On this basis，a new numerical model of hydraulic fracturing process is established by introducing the progressive failure criterion of fracturing energy and the extended rigid-body spring method. The processes of stress，deformation and crack propagation are simulated with the extended rigid body spring method，while the unsteady seepage problem is solved with the equivalent discrete fracture network model. To obtain the equivalent macroscopic permeability characteristics，a method is used to determine the mesoscopic seepage parameters. The applicability of the equivalent discrete fracture network model is verified through comparison with the analytical solution of a one-dimensional unsteady seepage problem. The hydro-mechanical coupling procedure is deduced through combination of the extended rigid spring method with the equivalent discrete fracture network model. The coupling method is verified by comparing with the elastic analytical solutions of thick wall cylinder under the condition of steady flow. An example is given to demonstrate the capability of the model to simulate the hydraulic fracturing process. The comparison with similar lattice model proves the superiority of the proposed model.

Key words： rock mechanics hydraulic fracturing RBSM crack propagation hydro-mechanical coupling

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	Articles by authors
	YAO Chi1
	ZHAO Ming1
	YANG Jianhua1
	JIANG Shuihua1
	JIANG Qinghui1
	2
	ZHOU Chuangbing1

Cite this article:

YAO Chi1,ZHAO Ming1,YANG Jianhua1, et al. A coupled RBSM-DFN model for simulating hydraulic fracturing[J]. , 2018, 37(6): 1438-1445.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1231 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I6/1438

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