The paper analyzes the inclination cause of a composite foundation of stone column pile for a 20000m 3 oil tank foudation, introduces the semi-circle ditch-digging method to treat the foundation inclination.

Finite element model for analyzing stress field of bottom hole based on excavating method;

The analysis model, excavating methods, analyzing process, and analysis options of the bottom-hole stress field are applied during the research process.

Identification criteria for low resistivity oil layers are established based on the knowledge acquired in study of the low resistivity reservoirs in Gudong oilfield, and production potential tapping methods are presented with respects t.

Memory management and pruning technique of the mining algorithm;

Constraint association-rule mining algorithm based on transaction clip;

Web log mining algorithm based on user interest

A covered excavation was adopted, which not only eliminated the problem of traffic blockage but also protected the adjacent buildings and services above the foundation pit, with much shorter construction period.

Combined with shallow tunnel of Maoshan west tunnel,this paper compares the covered excavation with open-cut method on technology and economy.