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为了有效控制金川Ⅲ矿区1 165 m水平破碎站大断面硐室围岩变形,根据对破碎系统工程的大件道工程围岩变形监测、变形影响因素的分析得出该矿区岩体具有临界蠕变应力低和碎裂剪胀蠕变特征,且变形持续时间长。针对该岩体的变形特点,在破碎站大断面硐室施工中采用“留空让压强支”原则,并提出留空让压强支方案的综合评价指标。设计了3因素4水平的正交数值模拟试验方案,通过综合评价指标的分析确定了合理让压位移量,即毛硐让压变形90 mm,初衬让压变形0,一次支护让压变形50 mm。为了破碎站硐室的安全评价和长期稳定性预测,采用FBG点式光纤光栅传感器监测围岩变形。
In order to effectively control the deformation of the surrounding rock of the large cross-section chamber of the 1 165 m crushing station in Jinchuan Ⅲ Mine, according to the deformation monitoring and deformation analysis of the surrounding rock of the bulky road in the crushing system project, the critical creep Low stress and cracked dilatancy creep characteristics, and deformation lasting a long time. According to the deformation characteristics of the rock mass, the principle of “left-over pressure-pressure branch” is adopted in the construction of large-section chamber in the crushing station and the comprehensive evaluation index of the pressure-relief project is proposed. The orthogonal numerical simulation experiment scheme of 3 factors and 4 levels was designed. Through the analysis of the comprehensive evaluation index, the reasonable displacement letting pressure was determined, that is, 50 mm. In order to evaluate the safety evaluation and long-term stability of crushing chamber, FBG point fiber grating sensor is used to monitor the deformation of surrounding rock.