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岩体稳定性评价是岩体工程设计和施工的重要内容,为了探讨岩体各部位的安全情况,引入单元安全系数Ke来评价岩体的微观稳定性,它能定量评价岩体在应力作用下的稳定状况;通过理论分析,推导了单元安全系数公式,然后,利用算例研究,探讨了单元安全系数的影响因素。研究表明:①随抗剪强度参数、黏结力c、内摩擦角准的增大,单元安全系数Ke逐渐增大;Ke与抗剪强度参数间符合显著线性关系;Ke随c变化的梯度明显大于Ke随准变化的梯度,黏结力对单元安全系数的影响大于内摩擦角对单元安全系数的影响;②最小主应力增大引起单元安全系数增大,最大主应力增大引起单元安全系数减小,符合实际情况,并且二者与单元安全系数的关系均呈现指数关系特征。
Rockmass stability evaluation is an important part of rock mass engineering design and construction. In order to explore the safety of each part of rock mass, the unit safety factor Ke is introduced to evaluate the microscopic stability of rock mass. It can quantitatively evaluate the rock mass under stress The theoretical analysis of the unit safety factor formula derived, and then, using case studies to explore the factors that affect the unit safety factor. The results show that: (1) With the increase of shear strength parameters, the cohesion c and the internal friction angle, the unit safety coefficient Ke gradually increases; Ke and shear strength parameters are in significant linear relationship; the gradient of Ke with c is obviously greater than Ke changes with the gradient of the permit, the cohesion of the unit safety factor greater than the impact of internal friction angle of the unit safety factor; ② The minimum principal stress causes the unit safety factor increases, the maximum principal stress increases cause unit safety factor decreases , In line with the actual situation, and both the relationship with the unit safety factor showed exponential relationship characteristics.