软岩及土质隧洞围岩稳定性评价新方法

发布时间：2018-08-03 08:44

【摘要】：首先提出对于软岩(土质)隧洞及时支护下的围岩变形稳定性可转化为支护结构的安全性这一评判理念,在此基础上进一步将初期支护(喷层)不出现拉压破坏时围岩与支护结构的对应变形作为评判标准,提出软质隧洞围岩稳定性评判新思路;考虑到支护结构内力的监测不便、不准,而支护结构的收敛变形监测较为方便与可靠这一工程现实,再次通过数值试验的方法,将支护结构的极限应力科学地转化为对应的支护结构的允许变形,进而建立能够考虑初期支护安全性的围岩稳定性评价新方法。该评判方法在新疆库尉输水隧洞工程的成功应用表明其具有较好的可靠性和适用性。
[Abstract]:Firstly, it is proposed that the stability of surrounding rock deformation under the timely support of soft rock (soil) tunnel can be transformed into the safety of supporting structure. On the basis of this, the corresponding deformation of surrounding rock and supporting structure is taken as the criterion when the initial support (shotcrete) does not appear tension and compression failure, and a new idea for stability evaluation of surrounding rock of soft tunnel is put forward, which takes into account the inconvenience of monitoring the internal force of supporting structure. The engineering reality that the convergent deformation monitoring of the supporting structure is more convenient and reliable is not correct, and the limit stress of the supporting structure is scientifically transformed into the allowable deformation of the corresponding supporting structure by the numerical test method. Furthermore, a new method for evaluating the stability of surrounding rock is established, which can consider the security of initial support. The successful application of this method in Xinjiang Kuwei water conveyance tunnel project shows that it has good reliability and applicability.
【作者单位】：西安理工大学岩土工程研究所;中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;
【基金】：国家自然科学基金资助项目(50879068);国家自然科学基金创新群体项目(40821001) 西安理工大学优博创新基金项目(207 002J1306)
【分类号】：U451.2

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