基于离散元的碎裂岩质边坡卸荷松弛特征研究

发布时间：2018-06-22 11:25

  本文选题：离散元 + 碎裂岩质边坡　； 参考：《金属矿山》2017年04期

【摘要】：边坡卸荷松弛特征对边坡稳定性具有重要影响。采用颗粒流法模拟碎裂岩质边坡卸荷全过程,探讨卸荷过程中能量、位移的时空演化规律。基于PFC模拟和探地雷达探测提出一种新的卸荷分区判定方法。研究结果表明:边坡卸荷过程能量经历骤变、波动、平稳3个过程,外力功大多以应变能的形式存储在岩体中;边坡平均卸荷深度达2 m,探地雷达在边坡卸荷区检测中具有良好的适用性;基于边坡变形特征和探测结果,将边坡分为开挖损伤区、卸荷影响区和轻微扰动区。
[Abstract]:The characteristics of slope unloading and relaxation play an important role in slope stability. The whole unloading process of fractured rock slope is simulated by particle flow method, and the space-time evolution law of energy and displacement in unloading process is discussed. Based on PFC simulation and ground penetrating radar detection, a new method for determining unloading zones is proposed. The results show that the energy of the slope unloading process experienced three processes: sudden change, fluctuation and stability. The external force work is mostly stored in the rock mass as strain energy. The average unloading depth of the slope is up to 2 m.The GPR has good applicability in the detection of the unloading area of the slope, and based on the deformation characteristics of the slope and the detection results, the slope is divided into three areas: excavation damage area, unloading affected area and slight disturbance zone.
【作者单位】： 江西省交通科学研究院;江西省高速公路投资集团有限公司;
【基金】：江西省交通运输厅科研项目(编号:2015C0017,2015C0020,2015C0067)
【分类号】：TU45

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