Design Study, Based On The Reliability Of The Bolt Sliding Pile Global Optimization

Anti-slide pile with anchored rod is an efficient method to strengthen and treat landslide. Anchored rod at the top of or other appropriate position of anti-slid pile can supply a tension for anti-slid pile, make the applied loads and the stresses of it distribute more rational (reasonable), thus, the dimension of anti-slid pile can be reduced. As a result the cost of it can be reduced largely. In the nation, anti-slide pile with anchored rod is applied widely, however, its calculation method and design theory are behind of its application in engineering. For'this, many scholars have been dedicated to research the theory about it. At the same time, many achievements have been made in theoretical research on it. At present, theoretical research of anti-slid pile with anchored rod is based on the definite analysis. However, the parameters described the soils and rocks are variable because of the properties of soil and rock and the interaction of soil and rock and structure. In addition, the calculation models are also uncertain. Therefore, the calculated results have some errors. The more reasonable method may be based on probability statistics.The paper intended to research the global optimization problem of the structural system of anti-slid pile with anchored rod based on the reliability analysis.First, the paper briefly introduced the history and basic theory of reliability analysis in civil engineering. Based on the achievements on anti-slid pile with anchored rod, the calculated method on structure mechanics was introduced. Since it considers the compatibility of deformation between the anti-pile and the anchored rod, it is the most appropriate method of theoretical calculation at the present time.Through compared synthetically, cohesion, internal angle of soil and axial compression of concrete are selected as random parameters depended on the characteristics of parameters described soils and rocks and the statistic analysis data , other parameters are taken as definite value. Monte Carlo numerical simulation, which is not sensitive to dimension, was applied. When making reliability analysis and calculation, pseudo-random numbers are produced through mixed congruence method, random variable values are generated by random sampling on basis of normaldistribution. In order to reduce the cost, important random sampling method, which is very efficient to reduce variance, was used to produce random variable. The reliability of anti-slid pile with anchored rod was simulated used Visual Basic program.Based on the analysis of reliability of it, the system of anchored rod -anti-slid pile was break up into anchored rod and anti-slid pile, which are two sub-systems. Anti-slid pile was break up into three the second grade system. The optimization allocation model was constructed on the basis of the equable allocation principle of reliability.A math model of anti-slid pile with anchored rod, which has optimization objective function and restraint condition, was constructed used the powerful calculation and analysis performance of Excel. The global optimization of anti-slid pile was performed used "plan solution".Finally, take the BaoTa Montain landslide as an engineering case, the reliability of design schemes were analyzed used the research results of this paper, optimization design was made and the practicability of the research results were examined by compared the cost of the three schemes which are the conventional scheme, the anti-slid pile with anchored rod schemes before optimized and after optimized one, respectively.