The Risk Evaluation And Control Of Disaster Bridge Foundation On Slope Area

In recent years, the inceasing development into the southwest of our country lead to more phonomena of construction of bridge foundations on the slope areas. As the important structures, the birdge structures are damaged by any slight deformations. So we should avoid landslide and other slope disasters usually In line selection stages.Because of the limitation of topography in our country, some bridges of highway or railway constructions can not be completely avoided to build in the landslide.There are two main types of disasters on slope area: the slope collapse and landslide. Mainly because the smaller range of impacts and lower depth cause low economic losses and casualtie, researchs on risk assessment of slope collapse are few.The researchs on landslide risk assessment are carried out deeper, and some academic institutions in some countries or regions have put forward a series of research projects on the landslide risk. But the researches about landslide vulnerability are few and some problems need to be solved. But for isaster control of research is relatively small part of the problem to be solved. Many previous studies of disaster control methods on slope area have been proposed, but the combination of the ground and bridge foundations catastrophe is relatively less and different control measures could be carried out according to he different types of landslides.This thesis has developed the risk ssessment and control of disaster bridge foundations on slope area through theoretical research and case analysis. Based on theories of slope risk assessment, sort out collapse risk assessment methods systematically on slope area, carry out hazard assessment and vulnerability analysis on landslipes, take the Zongshudang bridge landslipe as example. Through the above research, the main achievements and conclusions in this thesis are as follow:? Taking condesiration of the uncertainty of the phisical and mechanical parameters of landslipe and outside triggered factors, doing the research of landslide failure probability. The Landslide instability is influenced by many factors, and both external and internal factors are can not be ignored. Rainfall is the main external factors to consider in this thesis. The methods of extreme rainfall date sample are summaried include PearsonIII distribution and Gumbel distribution, and the solution methods of failure probability of landslide are obtained under different rainfall probability of occurrence.?I Proposed bridge landslide control measures, including the bridge landslipes destroyed on construction process and operational phase.?On the process of Landslide vulnerability research, I added vulnerability study of roads and bridges, which provides a basis for evaluating the vulnerability of bridge embankment.? As Zongshudang bridge landslipe as example, risk assessment analysis on deformation stage are carried outwith the relevant information of the Zongshudang Bridge landslide and hazard bearing body related survey data. Based on statistical analysis of rainfall monitoring data in Zongshudang form 1980 to 2012, this paper introduced the method to calculate frequency distribution curve parameter for maximum cumulative rainfall of five days, ten days and fifteen days in four stages, and then optimized the value of parameter. Besides, by calculating the probability of multi-day cumulative extreme rainfall distribution adopting Pearson Type III distribution curve, we obtained probability of landslide instability and failure during the two extremes of rainfall computing. What's more, I simulated displacement of landslide deformation under conditions T1 and T2 with Geo-Studio software.Meanwhile, I conducted the vulnerability assessment on the landslide carrier. On the basis of the probability of landslide destroy and vulnerability evaluation, I obtained landslide risk assessment under different conditions.