An Interface Model to Predict the Stability of Landslide with Weak Intercalated Layer
The landslide always consists of a lot of weak intercalated layers; the distribution and seepage-stress coupled effect of weak intercalated layer are the key factors affecting the landslide stability. In order to predict the stability correctly and mitiga
- PDF / 538,573 Bytes
- 7 Pages / 481.92 x 680.28 pts Page_size
- 27 Downloads / 169 Views
AN INTERFACE MODEL TO PREDICT THE STABILITY OF LANDSLIDE WITH WEAK INTERCALATED LAYER Yulong Luo, Hua Peng School ofCivil and Architectural Engineering, Wuhan University, Wuhan 430072, China The landslide always consists of a lot of weak intercalated layers; the distribution and seepage-stress coupled effect of weak intercalated layer are the key factors affecting the landslide stability. In order to predict the stability correctly and mitigate the disaster maximumly, a new type of seepage-stress coupled interface model based on the Goodman joint was proposed, which is based on the Biot's consolidation theory and interpenetration control method proposed by Desai. An elastic visco-plastic constitutive model was adopted to simulate the creep behavior, and a relevant FE program was developed to analyze the Dayeping landslide with weak intercalated layers, whose stability is attached important to the construction of Linxihe hydropower station. The calculated groundwater free surface is consistent well with the in-situ testing data, and the displacements and stresses suggest that the landslide may slide along with the weak intercalated layer from the elevation of 230m to 370m, especially when the water level downriver falls suddenly. The results provide theoretical bases for the landslide disaster forecast, prevention and construction decision of Linxihe hydropower station. The proposed interface model can predict the stability of landslide with weak intercalated layer correctly. INTRODUCTION
With the increasing of population, the extension of human activities and the influence of engineering activities on geological environment disturbance, the landslide disasters have become the most frequent and serious geological hazards. So predicting the stability of landslide and mitigating the disasters are very important and meaningful. It is well known that the distribution and seepage-stress coupled effect of weak intercalated layer are the key factors affecting the landslide stability, Oda. (1986). Thus modeling the coupled effect correctly is necessary, but the relevant studies are seldom reported. Generally, there are two methods modeling the weak intercalated layer now: (1) solid element, Chai et al. (2004). The materials at the top and bottom of weak intercalated layer are very different, and the relative sliding or opening may occur between the top and bottom, and yet the solid element can't model the discontinuous displacement of the weak intercalated layer. (2) Goodman joint or Desai element, Goodman et al. (1968) and Desai et al. (1984). The two elements can't consider the pore pressure, they can only take the seepage force or pore pressure as the extemalload to do the stress analysis, Samtani et al. (1996). In addition, the Goodman joint is difficult in deciding reasonable normal stiffness; though the
Desai element introduces the interpenetration control method to overcome the node penetration, it is short oftheoretical bases on deciding the mechanical parameters of interface. It can be concluded that the above me
Data Loading...
