Scholarlink

<p>The discrete element method (DEM) is an effective approach to obtain the rock mechanics behavior. Given that typical DEM models fail to account for the initial non-linearity in the stress–strain curve caused by closure of inherent microcracks, this paper proposes an inherent microcracks flat joint (IH-FJ) contact model for simulating rocks with inherent microcracks. Uniaxial compressive strength tests were conducted on model specimens with varying bonded ratios. The results indicate that a decrease in the bonded ratio leads to an increasingly pronounced initial non-linearity in the stress–strain curve consistent with observations from laboratory tests. To further extend the application of this model to rock simulation, sensitivity analysis was conducted using orthogonal sampling to examine the influence of the IH-FJ contact model’s micro-parameters on macro-mechanical properties including the elastic modulus, Poisson’s ratio, uniaxial compressive strength, tensile strength, and internal friction angle. The results show that the bonded ratio has the largest effect on macro-mechanical properties of rocks. Based on these findings, a calibration method for the IH-FJ contact model’s micro-parameters was developed. This calibration method was applied to the micro-parameters of Baishan marble from the deep-buried Jinping secondary hydropower station. The results demonstrated that the resulting simulated uniaxial stress–strain curve shows excellent agreement across the entirety of the corresponding laboratory test, indicating that the proposed calibration method for micro-parameters effectively captures the non-linear mechanical properties of rocks. Finally, transient unloading processes at the Jinping secondary hydropower station are simulated both the conventional FJ-contact model and the proposed IH-FJ contact model. The results indicate that the stress wave velocity is significantly lower when considering inherent microcracks. The research results expand the application of DEM to rock mechanics and provide a theoretical basis for studying the non-linear mechanical behavior of rock materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Method for Simulating Rock with Inherent Microcracks and Calibrate its Microscopic Parameters

  • 期刊论文

  • 发表日期：

    2025年2月17日

查看全文
  • Yu Chen,
  • Huanling Wang,
  • Shiqi Liu,
  • Wei Bao,
  • Fang Wang,
  • Bing Q. Li

摘要

The discrete element method (DEM) is an effective approach to obtain the rock mechanics behavior. Given that typical DEM models fail to account for the initial non-linearity in the stress–strain curve caused by closure of inherent microcracks, this paper proposes an inherent microcracks flat joint (IH-FJ) contact model for simulating rocks with inherent microcracks. Uniaxial compressive strength tests were conducted on model specimens with varying bonded ratios. The results indicate that a decrease in the bonded ratio leads to an increasingly pronounced initial non-linearity in the stress–strain curve consistent with observations from laboratory tests. To further extend the application of this model to rock simulation, sensitivity analysis was conducted using orthogonal sampling to examine the influence of the IH-FJ contact model’s micro-parameters on macro-mechanical properties including the elastic modulus, Poisson’s ratio, uniaxial compressive strength, tensile strength, and internal friction angle. The results show that the bonded ratio has the largest effect on macro-mechanical properties of rocks. Based on these findings, a calibration method for the IH-FJ contact model’s micro-parameters was developed. This calibration method was applied to the micro-parameters of Baishan marble from the deep-buried Jinping secondary hydropower station. The results demonstrated that the resulting simulated uniaxial stress–strain curve shows excellent agreement across the entirety of the corresponding laboratory test, indicating that the proposed calibration method for micro-parameters effectively captures the non-linear mechanical properties of rocks. Finally, transient unloading processes at the Jinping secondary hydropower station are simulated both the conventional FJ-contact model and the proposed IH-FJ contact model. The results indicate that the stress wave velocity is significantly lower when considering inherent microcracks. The research results expand the application of DEM to rock mechanics and provide a theoretical basis for studying the non-linear mechanical behavior of rock materials.