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围岩松动圈是制定隧道支护措施和整体稳定性评价的重要参数和依据,如何快速准确地确定松动圈范围已备受关注。以张-石(张家口至石家庄)高速公路上的多条隧道工程为背景,采用声波探测和理论计算相结合的方法,对不同埋深、围岩等级条件下的隧道松动圈进行了研究。基于D-P准则推导了围岩应力松动圈的弹塑性理论和损伤理论计算方法,其计算结果均小于单孔声波法测试结果,但两者变化规律类似。由于考虑了岩体的峰后软化特性,损伤理论分析法计算结果比弹塑性理论更加接近于实测值,运用损伤理论对围岩(特别是低级别围岩)松动圈进行预测是可行的,研究结果对其他类似工程具有借鉴作用。
The loose ring of surrounding rock is an important parameter and basis for formulating the tunnel support measures and the overall stability evaluation. How to quickly and accurately determine the range of the loose ring has attracted much attention. Based on the tunnel projects of Zhang-Shi (Zhangjiakou-Shijiazhuang) expressway, the loose ring of tunnel under different burial depth and surrounding rock grade was studied by the combination of acoustic detection and theoretical calculation. Based on the D-P criterion, the elastic-plastic theory and the damage calculation method for the stress relaxation ring of surrounding rock are deduced. The results of the calculation are all less than those of the single-hole acoustic wave method, but their changing laws are similar. Considering the post-peak softening property of rock mass, the damage theory analysis method is closer to the measured value than the elasto-plastic theory. It is feasible to use the damage theory to predict the loose ring of surrounding rock (especially the low-grade surrounding rock) The results of other similar projects have reference.