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对比研究了指数模型和双曲线模型拟合岩石锚杆P-S曲线的效果,选用指数数学模型对岩石锚杆抗拔试验数据进行统计分析。首先基于指数模型,由岩石锚杆抗拔验收试验P-S曲线预测得到岩石锚杆的极限承载力,然后根据岩石锚杆锚固长度反算出砂浆或混凝土与岩石间的粘结强度,并根据岩层软硬程度对统计结果分类,并取累积频率为90%对应处锚杆粘结强度作为最大参考值。结果表明,软岩和较软地质条件下,规范建议的砂浆与岩石的粘结强度值比统计值偏大20%,硬质岩地质条件下,规范建议值与统计值基本相符。
The effects of exponential model and hyperbola model on the P-S curve of rock bolt were compared. The index mathematical model was used to analyze the data of rock bolt pull-up test. First of all, based on the exponential model, the ultimate bearing capacity of rock bolt is predicted from the PS curve of rock bolt pull-up acceptance test. Then, the bond strength between mortar or concrete and rock is inverse calculated according to the anchor length of rock bolt. The degree of classification of the statistical results, and take the cumulative frequency of 90% corresponding to the bond strength of the anchor as the maximum reference value. The results show that under the conditions of soft rock and softer geological conditions, the bond strength between mortar and rock recommended by the code is 20% larger than the statistical value, and the proposed value is basically consistent with the statistical value under the geological conditions of hard rock.