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为预估和控制爆破荷载作用下围岩损伤范围,在赣龙铁路梅花山隧道工程现场进行岩体声波测试,得到围岩的损伤范围。根据爆破荷载作用下岩体损伤发展规律,采用基于概率形式的损伤变量定义,运用三维有限差分软件对不同地应力状态下爆破产生的围岩损伤范围进行数值模拟,并与现场岩体声波测试结果进行比较。计算结果表明,数值计算与实测结果有较好的一致性,随着地应力大小增大,围岩损伤范围呈现先减小后增大的趋势,且增大幅度较大,地应力较高时,局部部位如顶板、底板损伤更为明显,说明地应力大小对围岩损伤分布有着显著影响;随着侧压力系数增大,损伤范围先减小后增大,但增速逐渐减小。所得到的结论可为高地应力下隧道稳定性分析和支护设计提供依据。
In order to predict and control the damage range of surrounding rock under the blasting load, rock mass acoustic testing was conducted on the site of Meihua Mountain Tunnel of the Gan-Long Railway to get the damage range of the surrounding rock. According to the law of damage development of rock mass under blasting load, the definition of damage variable based on probability form is used to simulate the damage range of surrounding rock caused by blasting under different ground stress by using three-dimensional finite difference software. Compare. The calculated results show that there is a good agreement between the numerical calculation and the measured results. With the increase of the in-situ stress, the damage range of the surrounding rock first decreases and then increases, and increases greatly. When the earth stress is high, The damage of local parts such as roof and floor is more obvious, which shows that the magnitude of in-situ stress has a significant impact on the damage distribution of surrounding rock. With the increase of lateral pressure coefficient, the damage range first decreases and then increases, but the growth rate decreases gradually. The conclusions obtained can provide the basis for the analysis of the stability of the tunnel under high ground stress and the support design.