Solution of finite-difference method for horizontal load elastic long pile and middle long pile;

Considering the complex special distribution of soft earth stratums in fact, the length of pile by prospecting will be unsatisfied to the requirement of improvement.

The relationship between exciting material, frequency and length of piles is reached.

The application of low strain reflected wave method in pile length investigation;

Through the indoor simulation experiment research to the compound foundation using cement-soil pile,it analyzes and gets the relation among the pile length,bedding cushion and stress ratio,and points out this experimental model is worth to generalize due to the convenient operation,timesaving and labor saving,and realizing many experimental functions.

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.

Aiming at the typical engineering geology condition,based on that the mechanics performance and relationship between end pressure and bearing capacity of long pile combining with two engineering projects the pile-driving controlment problems of deep-long prestressed high-strength concrete(PHC) tube-shaped piles are studied by appling the engineering tests data.

Because of greatly undulate surface of the karst, deep karst slot and a great many holes, the piles foundations of high buildings, many of which are long piles, encounter the problem of probability of reaching holes.

In engineering design practice, the undersurface of load bearing layer loaded by the long pile often meets with soft soil underlayer.

In this paper, the test of two long piles is presented i n detail and the results of the test can strongly benefit the research on the lo ng bored piles working mechanism.

This paper made a analyses for load transmission principle of piles on weak fundation, and deductived simple method to determine effective length of the extra long piles.

Experamentil study on horizontal bearing capacity of long-pile in Ⅳ class collapsible loess region

Experimental study on horizontal bearing capacity of long-pile in Ⅳ class collapsible loess region

Practical engineering has proved that this method is very useful for detecting concrete quality in long-piles.