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[Thesis Abstract] negative friction serious problem affecting the safety of buildings, piles the size of negative friction is influenced by many factors,jordan kid shoes so its difficult to calculate accurate values. Introduction and pile on the negative friction generated by the conditions and mechanism of negative friction pile method of calculating the neutral point of identification, prevention and reduction of negative friction pile jordan kids shoes method.

With the improvement of the living environment of the humanities as well as rising land prices, building shift from the constant high-level kids jordans multi-storey building, which the foundation bearing capacity and deformation demands more and more high, more and more strict. Therefore deal with the foundation is becoming increasingly important.big kids jordan shoes Treatment works at the foundation as a result of negative friction problem, resulting in frequent accidents happen Engineering (buildings settlement, tilting, cracking), negative friction problem in engineering practice in our country has become a hot issue. kids jordan shoe Following negative friction on an analysis of the problem on.

First, the causes of negative friction

Soil pile is greater than the settlement of the settlement! Pile-soil relative displacement (or relative displacement trends) are the reasons for the formation of friction, pile foundation, if the soil to the pile to provide upward force is called friction; the other hand, Kids Air Force Ones compared with negative friction.

Settlement of foundation soil is too large, piles and soil is too large relative displacement pile foundation soil will have a downward pull of friction so as to enable a stable foundation to become unstable, the actual load may exceed the original proposal of the foundation kid jordans bearing capacity.

General may be caused or a combination of the following reasons: not consolidation of newly backfilled land base; ground overloading; piling after the dissipation of pore water pressure caused by consolidation settlement; kid jordan shoes groundwater level decreased, an increase of effective stress caused by soil subsidence; unsaturated fill subsidence due to water and wetlands; compressible soil to withstand sustained loading, caused by soil subsidence; seismic kids jordans shoes liquefaction.

Two, why the foundation design to be considered negative friction

Negative friction pile not only unable to bear the load to contribute to the upper part of the contrary, kid jordans shoes we must have a role in the pile the next rally. Caused by pile foundations yield or damage to the pile damage structures such as the impact of uneven settlement. Hence, in consideration of negative friction pile on the role of pile foundation pile foundation design are essential to one of th kids jordan shoes issues.