深部花岗岩钻孔卸荷三维数值模拟  

The 3D numerical simulation of deep granite borehole unloading

作　　者：张强[1,2,3,4] 孙国庆[1] 索江伟[1] 王海舰 

机构地区：[1]辽宁工程技术大学机械工程学院,阜新123000 [2]重庆大学机械传动国家重点实验室,重庆404100 [3]大连理工大学工业装备结构分析国家重点实验室,大连116023 [4]矿山液压技术与装备国家研究中心,阜新123000

出　　处：《应用力学学报》2017年第5期988-994,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然基金(51774161);国家自然科学基金(51504121);机械传动国家重点实验室开放基金(SKLMT-KFKT-201515);辽宁省自然基金(201601324);辽宁省优秀人才支持计划项目(LJQ2014036)

摘　　要：为了解决深部岩体掘进效率低、能耗大的问题,提出一种三维模拟的方法对深部岩石钻孔分析。采用ABAQUS软件建立动力学模型,结合切片法针对钻孔卸荷形成应力集中区域沿深度分布规律模拟分析;分析深部高应力花岗岩钻孔卸荷后形成的应力集中区沿深度变化的规律,研究在不同地应力的环境下不同钻孔深度及直径条件下应力的变化规律。结果表明:在50MPa地应力下钻孔直径为80mm和钻孔深度为120cm时,形成的应力集中区最大,成孔后岩体内部最大应力最小,卸荷效果显著。对于不同地应力的最佳钻孔卸荷参数不同,但都达到明显卸荷效果。研究结果为深部硬岩破岩机理和提高破岩效率提供了方法和理论依据。In order to solve the problem of low efficiency and large energy consumption of deep rock mass, a three-dimensional simulation method is presented for the analysis of deep rock drilling. Using the ABAQUS software to establish the dynamic model, according to the 'section method', the simulation of the forming stress concentration region along the depth distribution of the borehole pressure relief is simulated. The variation of the stress concentration region along the depth of borehole is analyzed, the region is composed of deep buried high stress granite and the stress concentration is caused by the stress-relaxation inside. The variation of pressure relief area under different drilling depth and diameter and ground stress is studied. The results show that: under stress of 50 MPa, drill hole diameter of 80 mm and depth of 120 cm, the maximum stress concentration zone is formed, and the maximum stress in the rock mass is the smallest, and the unloading effect is remarkable. For different ground stress, the best unloading parameters are different. The results provide a methodological and theoretical basis for the deep hard rock breaking and improving the efficiency of rock breaking.

关 键 词：深部硬岩 ABAQUS 切片法 应力集中区 钻孔深度 钻孔直径 地应力 

分 类 号：TD803[矿业工程—矿山开采]