摘要
水下隧道开挖后,渗流作用对围岩稳定性将产生严重影响。目前的理论解或数值解在考虑渗流作用时和实际的渗流作用存在较大差异;而且在分析过程中,渗流分析的区域为整个半平面,这不仅增大了计算工作量,而且较远处的渗流作用对围岩并不会产生较大影响。因此,针对水下隧道围岩的非线性渗流和计算流域界限问题,应用简单有效的数学方法推导隧道围岩中渗透力解析表达式,并应用解析方法研究隧道半径和埋深对渗流作用的影响;通过解析解与数值解的比较分析,解析解和数值解吻合得很好,证明本文所用数学方法的合理性;最后利用解析表达式对计算流域界限进行研究,提出确定计算流域界限的理论方法,研究结果既满足渗流计算要求,又可减少渗流计算工作量。
After tunnel is excavated,the effect of seepage on the surrounding rock is very serious. So far,the differences of seepage are remarkable between the analytical results or numerical results and the practical seepage influence. While analyzing,the considered seepage area is the whole half-plan,not only the calculating load is enlarged,but also the surrounding rock is not influenced more seriously by the farther seepage. Aiming at the problems of the nonlinear seepage and the calculated watershed in surrounding rock,a simple and effective mathematical method is presented to derive the seepage force expression in the surrounding rock;and the effects of tunnel radius and embedded depth on the seepage action are also researched by the analytical expression.Comparisons between the analytical results and numerical results show that they coincide with each other very well,and that the mathematical method proposed is rational. Finally,the analytical expression is used to research the calculation seepage boundary,and a new theoretical method to calculate the seepage boundary is proposed. The results not only satisfy the seepage requirements,but also save the calculation load.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第12期2402-2408,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
重庆市博士后特别资助项目(Xm2014093)
高等学校博士学科点专项科研资助项目(20120191110039)
重庆市自然科学基金计划资助项目(cstc2013jcyj A30005)
关键词
隧道工程
渗透力
计算流域界限
解析方法
数值方法
tunnelling engineering
seepage force
calculation seepage boundary
analytical method
numerical method
