Research Of Rockmass Mechanics Parameter On The Overlying Rock Subway Of Qingdao

With the rapid development of economic construction, the problem of urban traffic in Qingdao becomes more and more seriously in recent years. So it is very urgent to construct subway. Besides, Qingdao is a beautiful seaside city, and located in the large area late YanShan granite, it has good geological conditions.80% of the lines of the first project Qingdao subway are located in the granite. The rest of the tunnel are located in the Quaternary strata. The unique geological conditions of Qingdao granite would save a lot of money and then make the cost of construction much lower than other cities. Hence, how to use its granite features, taking its mechanical parameters, classification of overburden rock in Qingdao subway are significant! So the task is to study the existing criteria for Qingdao underground engineering design is not adapted to the problem of the use of Qingdao water drain test section of information on the subway for Qingdao this parameter requires the rock to rock and have played, for Qingdao area classification of the body lay a foundation of further study.The classification of surrounding rock mass has always been our concern for a long time. The study of the rock mass parameters is the basis of classification. There are a large number of current papers on the rock mass parameters. And there are a lot of methods, such as the rock specimen test method, in situ test methods, numerical simulation method. In recent years, ZHENG Ying-ren, Hu Wenqing, Zhang Liming etc. applied the strength reduction method to the tunnel project, and proposed the concept of the safety factor of the tunnel to evaluate the stability of surrounding rock in underground tunnel. This provides us a good method to the study of the surrounding rock mass parameter. So the use of ZHENG Ying-ren the strength of the broken down by a margin of safety calculation, the performance of rock body and eventually mechanics parameters to answer to Qingdao on the subway of the rock to rock physical parameters.Main tasks are as follows:(1) according to the strength to the parameter values that a different classification rock mass pair of the tunnel through the hole, flexible margin of the damage and destruction is a flexible response potential.(2) according to information, the establishment of a geological mapping a model of jointed rock mass, the different rocks level of safety, i find the potential for damage.(3) Under section of rock body model for the margin calculations based on the rock of mechanics parameter.(4) Select the overlying strata of Qingdao subway representational cross-section, finite element software ANSYS is used to calculate the stability of uniform nature and jointed rock underground tunnel. Through numerical calculation, safety factor can be gotten.The paper innovation is a line made by the strength to improve the parameters of a classification standard way to get some important conclusions, the body for Qingdao area classification further study and laid the foundation.