Study On Prediction Model Of Pit Foundation Precipitation Caused By Land Subsidence In Non-software Areas

With the rapid economic development, urban construction in the direction toward the depth of urban space can be fully utilized, high altitude and underground space resources are increasingly being to development, especially deep foundation Almost involve precipitation problems of foundation ground precipitation effects on the surrounding has attracted wide attention.Has generally confirmed that the settlement occurred after the foundation pit for the basic principles, the general view is that a lower head, soil water loss, increase in effective stress, to laminated dense consolidationFirst of all, the concept of land subsidence is given and the present situations of the land subsidence caused by dewatering is illusttrated in details. Second, introduction of the precipitation in the role of Foundation Zhong, foundation pit adverse impact on the surrounding environment and the role of precipitation and Settlement with time, And commonly used formula of land subsidence and its application conditions were analyzed.Then in the collection, collation and analysis of the non-soft soil area of north based on the historic data, research results from home and abroad, information on access to the large amount of data to multiple variable analysis, from a number of factors must be selected in a greater impact on land subsidence factor.Final choice of Beijing Subway Line as engineering examples, and innovative to build a multi-input, multiple output BP neural network model for settlement prediction, achieving the land subsidence Prediction, Network of each group are to meet the requirement of fitting the data to predict the results of the observations have sufficient explanatory power. This environmental and geological disaster prevention and effective control of land subsidence is of great significance...