How is the grade of geotechnical engineering investigation divided?

The classification of geotechnical engineering investigation grades is determined according to the comprehensive analysis of engineering importance grade, site complexity grade and foundation complexity grade. Code for Geotechnical Engineering Investigation (GB5002 1-200 1) divides geotechnical engineering investigation into three grades: Grade A, Grade B and Grade C.

(l) The engineering importance grade is divided into three grades according to the scale and characteristics of the project and the consequences of engineering damage or impact on use due to geotechnical engineering problems.

First-class projects: important projects with serious consequences;

Secondary projects: general projects with serious consequences;

Third-class projects: secondary projects, without serious consequences;

(2) The site level is divided into three levels according to the complexity of the site, and the first-level site is a complex site; Secondary site is moderately complex; The tertiary site is a simple site.

(3) The foundation grade is divided into three levels according to the complexity of the foundation, and the first level foundation is a complex foundation; The secondary foundation is moderately complex; The tertiary foundation is a simple foundation.

Therefore, geotechnical engineering investigation is divided into Grade A, Grade B and Grade C according to the following conditions:

1 Grade A: one or more of engineering importance, site complexity and foundation complexity are Grade A;

2) Grade B: survey projects other than Grade A and Grade C (Grade I projects built on rock foundation, if the site complexity level and foundation complexity level are Grade III, the geotechnical engineering survey level can be classified as Grade B);

3) Class C: those whose engineering importance, site complexity and foundation complexity are all Grade III are classified as Class C. ..

For example, for important projects, foundations with complex terrain and uneven rock and soil, it is Class A survey; For the second-class project, the terrain is simple, and the geotechnical type is single and uniform, so it is Class C survey.

Through the classification of survey grades, it is beneficial to treat all aspects of geotechnical engineering survey differently according to grades, determine the work contents and methods of each survey stage, and ensure the quality and safety of the project.