注浆加固和可压缩层联合作用下隧道力学行为研究  

On the analysis of combined supporting effects of grouting reinforcement and compressible layer on mechanical behavior of tunnel

作　　者：邵珠山[1,2] 吴奎 胡宏坤 赵南南 秦溯[1,2] Shao Zhushan;Wu Kui;Hu Hongkun;Zhao Nannan;Qin Su(School of Civil Engineering,Xi'an University of Architecture and Technology,710055,Xi'an,China;Shaanxi key laboratory for geotechnical and underground space engineering,Xi'an University of Architecture and Technology,710055,Xi'an,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安710055

出　　处：《应用力学学报》2020年第5期2021-2028,I0013,I0014,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11872287);陕西省科技厅重点研发计划(2019ZDLGY07-10);西安建筑科技大学优秀博士学位论文培育基金(1608419002)。

摘　　要：根据高地应力深埋隧道的变形特征,以围岩加固和变形能量释放为原则,提出了注浆加固与可压缩层联合支护的方法,建立了基于注浆加固与可压缩层联合作用下的隧道力学模型;推导了在联合作用下隧道应力场和位移场的解析解,并与数值计算结果进行了对比验证。结果表明:围岩的注浆加固和可压缩层的设置均能有效改善衬砌的受力情况。在其他条件保持不变时,衬砌的压力和位移,以及围岩的位移都随着注浆加固层厚度的增大而减小,但压力和位移的减小趋势随着其厚度的增加而趋于平缓。同样地,可压缩层厚度增大可导致围岩变形能量更充分地耗散,衬砌的压力及位移均随着可压缩层厚度的增大而不断减小,该减小趋势随可压缩层厚度的变化趋于平缓。但是,随着可压缩层厚度的增加,围岩的位移却不断增加。另外,隧道变形的改善效果与可压缩层填充材料的力学参数密切相关,当其弹性模量由26MPa增至160MPa时,衬砌位移迅速增加。因此,该填充材料应具备足够的变形能力才能达到吸收围岩变形、改善衬砌受力的目的。Based on the deforming characteristics of soft rock, the combined supporting method of grouting reinforcement and compressible layer is proposed in this paper. Then the tunnel mechanical model is established and analytical solutions for stress and displacement fields around tunnel are derived in this paper. The reliability and effectiveness of analytical solutions are validated by use of numerical calculation. The results show that stress state of liner can be greatly improved by grouting reinforcement and installation of compressible layer. If other parameters are kept unchanged, pressure and displacement of liner and displacement of surrounding rock decrease with increasing of thickness of grouting ring. But such improvement seems more and more insignificant with increase of its thickness. Similarly, pressure and displacement of liner decrease as thickness of compressible layer increases due to greater release of surrounding rock deformation and this decreasing trend also becomes gentle with its thickness. However, with the increase of thickness of compressible layer the displacement of surrounding rock increases as well. Furthermore, the effects of compressible layer are closely associated with mechanical parameters of its filling materials. If its Young’s modulus increases from 26 MPa to 160 MPa, the liner displacement growssharply. So, filling material should have sufficient deforming capacity for the achievement of absorbing surrounding rock deformation and improving the liner stress state.

关 键 词：深埋隧道 注浆加固 可压缩层 弹性解 参数分析 

分 类 号：TU45[建筑科学—岩土工程]