Reasonable pile spacing in the design of pile foundation;

A theoretical criterion for judging the failure mechanism occurring below the base of pile groups is presented and the values of bearing capacity coefficients N_q and N_y which take account of the effect of rough or smooth base, pile spacing and angle of pile tip are obtained by means of an rigid-plastic model in this paper.

Anti-liquefied effect of different pile spacing foundation is explored through shaking table test,and some questions are proposed.

The study of proper piles spacing in row piles retaining and protecting structure based on horizontal soil arching effects;

Based on the analysis of the soil arch effect between adjacent anti-sliding piles in some slope projects,it is proposed that the relation between the piles spacing and the cohesive force c as well as the internal friction angle of the soil behind piles can be found,and the suitable spacing can.

The engineering analysis of suitable ram-compaction pile distance;

Based on static loading tests of cement-soil mixing composite foundation,the impact of the pile length and pile distance on the bearing capacity,the impact of the pile length on the settlement,as well as the variation rule of pile-soil stress ratio under varying pile distances and loads were analyzed.

Through the analysis and calculation, the article finds the subgrade treatment cost is the lowest when the square ratio of the pile length with the pile distance is the minimum.

The Manning roughness coefficients for the multi-pier are evaluated for the various cases of longitudinal and lateral pier spacing and water depth.