NUMERICAL SIMULATION AND ANALYSIS OF MOISTURE-HEAT COUPLING OF SOFT ROCK TUNNELS IN THE COLD REGIONS
With the western development in China, More problems with rock and soil engineering in cold regions will be encountered. To study the stability of rock mass under the frost and thaw condition is of far significance. In this paper, we attempt to simulate and analyze the temperature and moisture field in the surrounding rock of DABANSHAN tunnel at its exit K106+025 in the cold region by software Femlab. First, we introduce the common numerical solution to the moisture and heat coupled about the soft rock in tunnels of cold region. Then we give emphasis to simulation of the law of temperature distribution coupled temperature-moisture field and draw a parallel between temperature field with different coefficient of percolation. In the course of simulation we ponder upon the problem of caloric receptivity, thermal conductivity and critical heat varying with temperature. On the basis of the simulation results and analysis we can reach some conclusions: the frozen circle will be thinner when taking account of the moisture field, and it will be much thinner if the seepage coefficient is increased. The moisture field influences the redistributing of temperature field considerably. We can learn that the frozen depth of vault roof is the deepest, the bottom of vault is deeper and the side wall is the thinnest and the result is similar to the engineering experience from the table of frozen depth and temperature cloud plot. So, we must consider the influence of moisture field in the actual design and this will be beneficial to material saving during construction due to the frozen depth will be thinner when taking account of the moisture field. The software Femlab is proved effective for providing some reference for the engineering design if the necessary data is collected through the simulating example.
Gengshe Yang Chunhua Zhou Yingguo Tian
Institute of Architecture and Civil Engineering, Xian University of Science &Technology,Xian 710054, P.R.China
国际会议
南京
英文
440-446
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）