SOIL INVESTIGATION

ByM Firdaus, MT

www.dauspoli.co.cc

Preface • How to investigate of soil :

– Digging test holes (test pit)– Drilling– Directly in the field test (in-situ test)

• The purpose of soil investigation :1) Determine soil bearing capacity according to the selected type of foundation2) Determining the type and depth of foundation3) To locate the ground water4) To predict the settlement of soil5) Determining the soil pressure against retaining wall or on abutmen6) Investigate the safety of a structure when the investigation carried out on

existing buildings7) on road and irrigation projects, soil investigation is useful for determining the

location of channels, culverts, finding the location and types of deposits/ quarry

Soil Investigation Tools

Tools of soil sampling equipment

Insitu Test

Plate Loading Test 1 m x 1 m

Plan of soil investigation spot

The depth of drill hole

Information investigation of soil for foundation design :

1) Topographic conditions of work site2) The location of buildings that are embedded in the soil (utility)3) Local experiences related to damage of buildings that often occurs in the

vicinity of the location work4) Global soil conditions, ground water level and depth of rock5) Climatic conditions, flood elevation, soil erosion and large earthquakes6) Availability of natural materials and quality7) Geological data related to the process of forming a layer of soil and rock

around the site8) The results of laboratory investigations on soil and rock samples9) Photo field conditions and existing buildings