Study Of Optimal And Optimization Design Plan On Deep-pit Supporting

Deep foundation pit is a complex structure and the ground project question, which characterized bye complexity and comprehensive, the choice of it supporting system plays an important role in enhancing the project quality and reducing accident. It involves the security, the economy, the environmental protection, the construction time and so on. Therefore, how designing safety, reasonable, feasible scheme on deep foundation pit, has become the domestic and foreign together matter of concern.In view of the questions on structural design of deep foundation pit and the experiences in the construction process, In this paper, using the method which combining theoretical guidance, model analysis and engineering application, reasonable exposition and analysis the selection and detail optimization of deep-base-hole design scheme, put forward my own opinions, and by this guide better project design and engineering practice.This paper introduces deep-base-hole excavated for building foundation common supports and protections structure type and applicable station, qualitative analysis deep-base-hole design scheme, then analysis basic principle and basic basis of supporting system of foundation deep pit optimization scheme which leaves to the primary election carries on optimal. Discussion the methods of optimization and optimum select, pose the new methods of optimization and optimum select.In view of optimal-factor's the fuzziness characteristic of supporting system of foundation deep-pit scheme, based on fuzzy mathematics principle has established the synthetic evaluation model of supporting system of foundation deep-pit scheme optimization. Its indicator system including 4 aspects—The technology feasible, the time saved, the economy to be reasonable, the quality and the safe reliable.Using this quality synthetic evaluation model, to carry on scheme optimization optimal based on primary election. This paper take some civil air defense project deep hole excavated for building foundation engineering design as an example, proposed that the deep hole excavated for building foundation supports and protections structural design scheme, carries on the supports and protections scheme primary election by the qualitative analysis, then carries on the quantitative analysis to primary election several schemes, combination multi-objective fuzzy evaluation model, finally determines the optimal method of the most superior supports and protections structural design schemeAfter the optimum scheme is set through the selection of methods, the specific and refined designing of selected scheme is needed. This paper take the hospital's newly building's foundation pit as the example, considered emphatically the supports and protections structure security and economical and rationality, study concretely the scheme of construction, special part of the supports and protections design, the deep hole excavated for building foundation supports and excavates the scheme, the precipitation scheme, the monitor scheme as well as the environmental protection scheme.