In this paper,the relationship between the vertical load bearing capacity of a single pile and the thickness of sediment dirt under the pile is discussed by using the probability and statistic method.

Methods of Controlling Unusual Sediment in Phosphating Slot;

Some Measures on Reduce the Sediment of Phosphating Technology at Low Temperature;

Phenols take part in the formation of accelerated oxidation stability sediment.

And the influence of slime present beneath a bored pile base on load-transfer function for pile base is considered.

By static loading test and field test of loading transmission the influence of slime at pile botton to ultimate bearing capacity, pile tip resistance, side friction of pile are analyzed and effective measures are also proposed.

The idea on low strength request ( relative to the strength of the pile shaft ) to grouted body in sedimentary region at the pile bottom is clarified.

The paper gives an account of the two key points in quality control of rock socketed castinsitu piles, covering the determination of the moderately weathered rock and the debris in the bottom of boreholes.

Based on the technique of load transfer of pile foundation,the author proposes a simple analytical method of pile soil rock interaction,which may reflects the influence of debris (or weathered layer) under the pile tip.