Checking calculation of soft underlayer and foundation type selection of one project in Yichang;

Foundation bearing capacity includes two parts, bearing course and soft underlayer.

In order to broaden the adaptability of computing method for calculating the soft underlayer s bearing capacity in current foundation design criterion, this paper founds general mode of computing the soft underlayer s foundation bearing capacity on the base of summarizes and analyzes the data and design experience of every criterion of our country in 50 years.

During the detailed foundation geotechnical exploration process of a Yichang finished goods warehouse,a weak underlying layer was found.

When natural soil,higher bearing capacity and soft substratum in influence depth,cannot satisfy the request of bearing capacity and deformation,CFG piles are adopted to strengthen soft substratum.

Based on the method of flare angle of pressure checking the strength of soft substratum,which is defined by Code for Design of Building Foundation(GB 50007—2002),some aspects,that can be easy ignored,are introduced.

In the same condition,it s rationality and feasibility of the safe of soft substratum are proved by applying the specification and the brief formula.

When there is weak underlying stratum bellowed the soil which is not be reinforced,the weak underlying stratum should be taken checking computations.

This paper presents a computing method for fast calculating rectangular foundations with weak underlying stratum.

The direct calculation formulas of the rectangular foundation containing weak underlying stratum are induced and a computer program is developed.

When engineers design bar foundation of mason work with flaccid groundsill, they always make checking computations with the flaccid groundsill before they gain the width of the foundation.