During the application of fast Lagrandian analysis of continua in 3 dimensions (FLAC3D),even for some simple irregular geologic bodies,the generation of quasi-3D numerical model with FLAC3D is difficult to construct. A new modeling method is put forward and an interface program of IMAGE-FLAC3D is realized by visual basic language in order to build numerical model of FLAC3D based on pairs of pixel units index numbers (i,j) and give the element different properties as well as different function modules(such as excavation,backfill) based on the color attribute of pixels. Through the interface program of IMAGE-FLAC3D,we can easily generate a microscopic and macroscopic irregular quasi-3D model based on the digital image in a short time. Then a finite difference model of soil-rock mixture and a finite difference model of landslide are developed,which show the feasibility of IMAGE-FLAC3D. The case study shows that the intuition,fastness and automation of modeling can be realized. Finally,the stability of landslide is analyzed by strength reduction method,whose results(such as the safety factor and the location of most dangerous slip surface) are in better agreement with those calculated by limit equilibrium method,which shows the computability of the model from IMAGE-FLAC3D. In a word,this paper gives a typical example that the digital image serves geotechnical engineering.

The established method of Herle and Kolymbas's (HK's) clay hypoplastic constitutive model is described. Several shortcomings of HK model are listed in detail by analyzing clay behavior and response envelope line; then three parameters in HK equation are modified to develop a modified HK hypoplastic formulation and determine parameters. The modified model has advantage of a few parameters which are easy to determine and a simple formulation. Meanwhile, modified HK model not only are based on rigorous mathematics and mechanics, but can be applied to practice.

Creep characteristics,physics mechanics and advantage of Xiyuan model and modified Xiyuan model are described briefly.According to the mechanics characteristic of accelerating creep phase,the Xiyuan model is unreasonable to describe the accelerating phase.With the damage variable,the creep strain of damaged materials and undamaged one consists of total strain;furthermore,creep equation of unstable phase is developed.Creep ele-ment equation is founded by finite element method,and the FE program is compiled to analyze creep.

This paper adopts the two methods: water absorption of irregular rock in both dry and saturated conditions and cemented coefficient of rock,proposed by Qu Yongxin,to study the swelling potential of mud rock.The mud rock is in some tunnel coal mine in Shanxi.The results show that the mud rock does not swell.On the other hand,the paper examines the mineral composition of the mud rock.It is found that the mud rock has much,non-uniform distributed quartz and iron,as well as kaolinite.The kaolinite is the main clay mineral.The mud rock shows brittle failure when it is compressed under uniaxial and triaxial tests with low confining pressure.Finally,the paper introduces several factors influencing the failure of rock.The factors include mineral composition,configuration and conformation,characteristic of joint or tiny joint surface and extension cranny in rock.

Deformation of soft rock roadway of coal mine is serious during excavating,as rock mass of area which roadway located is broken,and the distribution of roadway is highly concentrated, surrounding rock of roadway are of the possibility of whole instability. In order to forecast the stability of soft rock roadway and to provide data for second supporting system,monitoring research on convergence deformation is implementing.The distribution of roadway convergence monitoring set and monitoring project are present;meanwhile monitoring result of six monitoring set is are also present,and some conclusions are obtained by analyzing result.

The deformation stability of rock test system is studied based on rigidity criterion and nonlinear catastrophe theory.The rock deformation stability is dependent on the environment rigidity and the equivalent rigidity of rock.The rock instability occurs at a position after the peak value in the constitutive curve.An increase in the environment rigidity will be beneficial to the system stability and rigid loading will generally not lead to a strong instability-caused destruction.The formula for the deformation value corresponding to the instability position of the test system is found based on the cusp catastrophe model and rigidity criterion.

A coattail catastrophe model of landslides was presented,and the necessary and sufficient conditions leading to landslides were discussed.The sliding surface of the landslides was assumed to be planar and the combination of two media: medium 1 was elastic-brittle or strain-hardening and medium 2 was strain-softening.In this way,a coattail catastrophe model of landslide system would be established.Through the analysis,it was discovered that the slope stability was greatly related with the stiffness ratio k of medium 1 to that at medium 2 and the geometrical-mechanical parameter ξ.Through analysis of parameters p,q and r.the complexity of the sliding system was found.When p was a fixed value,there were different zones of stability and instability in the control plane of q and r.