Study On Failure And Reliability Of Underground Structure

In geotechnical field, the problems of underground structural has been concerned by people for a long time, especially during the time when the traffic field has greatly developing in our country. The tunnel's construction will be more and more with time going on, furthermore, much longer and bigger span tunnel will be the developing. Because of the tunnel's structural that is complexity and the parameter lithology is in-determination, which makes the reliability problem more extrude. The tunnel tructure stress characteristic had decided it in the design,the construction and the use process which has all sorts of influence underground structure safe, and suitable with the durable uncertainty, like stochastic uncertainty,fuzzy uncertainty and imperfect and so on.On the base of reading a great deal of literature, through to the tunnel structure instability reason analysis, has discussed the tunnel instability influence factor and the instability form, simultaneously has carried on the system elaboration to the tunnel instability judgment basis, had determined the tolerable limit displacement quantity takes this article tunnel structure instability simulation the determination basis.The paper depends on the Shiziping underground workshop Ith tunnel, uses its pertinent data, selects the Druker-Prager criterion to submit the criterion as the rock mass to carry on the three dimensional non-linear finite element analysis, the margin of safety simulator study and to the existing monitor material reorganization analysis contrast to the typical sector, which has obtained a more satisfactory result.This paper discuss the excavate simulation and reliability of the underground cavity's wall rock deeply. The ground stress distribution is the main factor that affects the reliability of the wall rock, so taking the non-determinacy of the ground stress into account, the probability analysis of the ground stress distribution is discussed in detail. During the simulation of the strengthen effect that introduced by anchors, taking the non-determinacy of the separation and the material character of anchors into account, the stochastic analysis method of the strengthen effect is presented, which provide the foundation for the security analysis of the wall rock with anchors. The seep loading is one of the main loadings that affect the stability of the wall rock, so a simplified model is presented to illustrate the effect of the seep loading's randomness. Moreover, the sensitivity of the reliability of the wall rock to the parameters of various materials and the ground stress coeffcient is discussed.In the aspect of the utility, the three-dimensional simulation of the Shiziping underground workshop Ith tunnel's excavation process is present by the ANSYS plat, and then the wall rock displacement, stress and shoring internal force is discussed. Finally, the reality of the reliability analysis by the ANSYS plat is discussed to prove the advance of the stochastic finite element method.