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为了对锚杆支护设计提供理论依据,本文利用J.Dundurs公式算出了单支锚杆,成组布置锚杆和锚杆桁架在围岩中引起的附加应力场的理论解,(1)、(2)、(3)式。经光弹实验结果分析,证明理论解是正确的。 根据电算的理论解的应力值,文章探索了单锚杆,成组布置锚杆和锚杆桁架的支护机理。并讨论了各种支护参数的选取原则。 本文还讨论了锚杆桁架倾角对压应力分布的影响,认为在锚杆桁架跨度确定后,存在一个最优倾角使压应力值为最大。
In order to provide a theoretical basis for the design of bolt support, this paper calculates the theoretical solution of the additional stress field caused by single-bolt, groud-arrangement bolt and anchor truss in the surrounding rock by using the formula of J.Dundurs (1), (2), (3) type. The result of photoelastic experiment shows that theoretical solution is correct. According to the calculated stress value of the theoretical solution, the paper explores the supporting mechanism of single anchor rod, grouped anchor rod and anchor truss. And the principle of selection of various support parameters is discussed. The paper also discusses the influence of the anchor truss inclination on the compressive stress distribution. It is concluded that there is an optimum inclination angle to maximize the compressive stress after the truss span is determined.