基于隧道施工阶段地应力实测数据的岩爆判据研究

Analysis of Rockburst Criteria Based on Measured Data of In-situ Stress During Tunnel Construction

云南省蔓金高速草果山隧道属于深埋长隧道,隧道围岩坚硬完整且脆性较高,隧道施工阶段面临着岩爆发生的风险。因此,采用应力解除法进行地应力测量,并基于实测数据结合现场岩爆发生情况与国内外不同的强度判据进行对比,并对岩爆判据的适用性进行分析研究。最后,根据岩爆实际发生的情况和位置对岩爆判据进行验证分析,结果表明:岩爆预测标准除应力指标外,还应使用多因素指标进行综合判别;某种岩爆预测方法不能适用所有地下工程,应结合工程的具体情况,进行岩爆危险性评估,为工程提出岩爆防治措施。同时此研究成果为深埋完整硬岩的岩爆灾害分析预测和防控提供了参考依据。

Caoguoshan Tunnel of Manjin Expressway in Yunnan Province is a deep-buried long tunnel.The surrounding rock of the tunnel is hard,complete and brittle.The tunnel construction stage faces the risk of rockburst.For this reason,the stress relief method is used to measure the ground stress along with the construction progress,which provides basic data for the analysis and prediction of rockbursts.In this paper,the measured original rock stress data is used to compare the occurrence level of rockburst through formula operation and fitting analysis,combined with different strength criteria.Finally,the verification and analy⁃sis are carried out according to the actual occurrence and location of rockburst.The results show that in addi⁃tion to the stress index,the rockburst prediction standard should also use the multi-factor index for compre⁃hensive judgment;A certain rockburst prediction method cannot be applied to all underground projects.It is necessary to combine the specific conditions of the project,conduct rockburst risk assessment,and pro⁃pose rockburst prevention measures for the project.The research results of this paper provide a reference for the analysis,prediction and prevention of rockburst disasters in deeply buried intact hard rocks.