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推导了锚杆支护作用下板裂结构顶板岩层分层稳定跨距计算公式，并分析了岩层厚度、强度和埋深三因素对稳定跨距的影响规律
The calculation formula of stratified stability stratification of roof rock strata under the action of bolt support is deduced, and the influence rules of the three factors of strata thickness, strength and depth on stability span are analyzed