Important role of karstification in the Lower Permian reservoir in Sichuan Basin;

Geologic conditions in karst region are very complicated,for example,earth caves,karstification,tectonic,groundwater and underground river are very rich,all of which would influence on pile types,quality and safety seriously.

Vertical zonations for different type karstifications are discussed.

Current status and comprehensive countermeasures of soil erosion for Karst rocky desertification areas in the Southwestern China;

Fuzzy-based Evaluation of Karst Eco-environment Fragility at Houzhai Underground Basin in Puding County,Guizhou Province;

Ecological water use and its coordination assessment in Southwest China karst mountain——A case study on Houzhai subterranean stream basin,Puding county,Guizhou province;

Study on the geologic forecast s way tunnel of in karsts-geology;

Study of the Characteristic of Bearing Capability of Pile Foundation in Karsts Area;

Research conclusions:The karsts encountered in the construction can be divided into four types according to the engineering geological charac.

Numerical analysis of influence of karst caves in top of tunnel on stability of surrounding rock masses;

Based on pile foundation design and construction for karst caves of Shuiyang Bridge,summarization on some treatment measures,like bridge basic geological exploration in karst growing area,bridge pile foundation design,safe thickness calculation of top surface in karst caves and other problems,will provide relative information for pile foundation design and construction in similar regions.

Karst caves are the grave geologic hidden trouble in the infrastructure construction such as superhighway,railway and dam.

According to the analysis results,the karst cave under pile-end mainly effects the shaft resistance around the whole piles.

Characteristics of apparent resistivity distribution in structurally fractured zones,old underground workings and karst caves are summarized.