How many types of soil does hard soil belong to, and how many types of soil are there?

Hard soils belong to three types of soils.

Medium-dense cohesive or loess, moist clay or loess containing crushed stone, pebbles, or debris of building materials.

Mainly use pickaxes, hoes, and a few shovels.

According to the engineering geological classification of soil, hard soil belongs to three categories.

In building construction, soil and rock are divided into eight categories according to the hardness of soil and rock and the difficulty of construction and excavation. See the table below for details:

The hard soil belongs. For details of the third and fourth types of soil, please refer to the engineering classification table of soil on page 270 of the building construction manual.

It belongs to three types of soil.

Classification description: A type of soil --- soft soil.

Class II soil --- ordinary soil.

The three types of soil --- hard soil.

The four types of soil --- gravel and hard soil.

Five types of soil --- soft stone.

Six types of soil --- secondary solid stones.

Seven types of soil --- solid stones.

Eight types of soil--- extra hard stones.

The details can be found in the engineering classification table of the soil, and will not be repeated.

What the hell is this, I can't understand it, I can't even read the picture???

The three types of soils are clay or ice clay, heavy loam, and coarseGravel, dry loess or natural mixed with crushed stoneWater contentLoess, etc., the solidity coefficient of the soil is 0 81--1 0, and it must be excavated with a sharp shovel and a pickaxe. Soil type of civil earthwork excavation.

It is divided according to the hardness of the soil, and the standard for the division of dry soil and wet soil is based on the groundwater level, which is dry soil above the groundwater level and wet soil below the groundwater level.

Soil refers to a layer of loose material on the earth's surface, composed of various granular minerals, organic matter, water, air, microorganisms, etc., which can grow plants. Soil is composed of minerals weathered from rocks, organic matter produced by the decomposition of animal and plant and microbial residues, soil organisms (solid substances), water (liquid phase substances), air (gas phase substances), and oxidized humus.

Related information

The substances in the soil can be summarized into three parts: the solid part, the liquid part, and the gas part. Soil minerals are rocks that have undergone weathering.

Mineral particles of different sizes (sand, soil and gum) formed. There are many types of soil minerals and complex chemical composition, which directly affects the physical and chemical properties of soil.

It is one of the important nutrients of crops.

Solid soil particles composed of minerals and humus are the main body of the soil, accounting for about 50% of the soil volume, and the pores between the solid particles are occupied by gas and water. The vast majority of soil gases are made up of the atmosphere.

A small part of the incoming oxygen, nitrogen, etc., is carbon dioxide produced by life activities in the soil.

and water vapor, etc. The moisture in the soil enters the soil mainly from the surface and includes many dissolved substances.

The first type of soil is soft soil, which refers to slightly cohesive sandy soil, silt soil, humus soil and loose planting soil, peat (silt).

The second type of soil is ordinary soil, which refers to moist cohesive soil and loess, soft saline soil and alkaline soil, accumulation soil containing building material debris, gravel, pebbles and planting soil.

The third type of soil is hard soil, which refers to medium-dense cohesive soil or loess, and moist cohesive soil or loess containing crushed stone, pebbles or scraps of building materials.

The four types of soil are gravel and hard soil, which refers to hard and dense cohesive soil or loess, medium dense clay soil or loess containing crushed stone, gravel (stone with a volume of 10 30% and a weight of less than 25kg), hardened heavy saline soil, and soft marl.

A type of soil refers to sand, humus, etc.;

The second type of soil refers to loess, soft saline soil and alkaline soil, loose and soft gravel, sand mixed with gravel and humus.

The firmness coefficient of the first and second types of soil is low (0,5--0 8), and it can be excavated with a shovel and a few pickaxes.

The three types of soil refer to clay or ice clay, heavy loam, coarse gravel, dry loess or natural moisture loess mixed with gravel, etc., the firmness coefficient of the soil is 0 81--1 0, and it must be excavated with a sharp shovel and a pickaxe.

The four types of soil refer to the hard clay, heavy loam containing gravel, moraine clay containing boulder, mud slate, etc., with a firmness coefficient of 1 0 1 5, and the excavation of the soil must be carried out simultaneously with a shovel, a pickaxe and a crowbar.

Look at whether the soil is flexed to distinguish it! Ground treatment should be explained in detail!

It is divided into soft soil, ordinary soil, solid soil, and gravel solid soil, which mainly distinguishes the sand content of the soil.

About the classification of soil and the difference:

In the project budget, the first and second types of soil are the ordinary soil in the quota, and the fastening coefficient is between. When the workers are working, the excavation method can be excavated with a shovel for the first type of soil, and the second type of soil can be excavated with a shovel and a small amount of pickaxes at the same time.

The three types of soil are the solid soil in the quota, the fastening coefficient, and the excavation method is to use a shovel and a shovel at the same time with more than 30% of the excavation time with a pickaxe.

The four types of soil are the sand and gravel solid soil in the quota, the fastening coefficient, and the excavation method is to excavate with a sharp shovel while more than 30% of the excavation is assisted by a pickaxe and crowbar.

Unless this is a survey unit, it is enough to understand it a little. Because no matter whether you are engaged in construction or cost, as long as it involves the type of soil, you can ask the construction unit (Party A) for the geological survey report issued by the survey unit, and the report will detail how many types of soil the surface layer is, how many meters down to how many meters is several types of soil, and the groundwater level.

The purpose of soil classification is to recognize and identify the types of soil through classification, and to study and evaluate different types of soil, so as to better utilize and transform the soil to adapt to and meet the needs of engineering construction. Soil classification is an important basic theoretical topic in engineering geology, and it is also one of the important contents of soil mechanics. It is of great significance in the field of scientific research and practical application in engineering.

For a wide variety of soils with different properties, they should be classified according to certain principles, so as to select the research content and methods more reasonably, and give correct evaluation to different soils according to the requirements of different engineering construction, so as to provide an objective and practical basis for the rational use and transformation of various types of soil. Therefore, in all kinds of engineering investigation, all kinds of soil in the study area should be classified and reflected in the engineering geological plan and profile drawing, as the basis for engineering design and construction.

Soil classification can be summarized into three basic types: general classification, local source classification and specialized classification.

1. The general classification is to include all kinds of soil often encountered in engineering construction, and consider the main engineering geological characteristics of the soil. This is a relatively comprehensive and comprehensive classification, which has great theoretical and practical significance, and the most common soil classification is this classification, also known as general classification.

2. Local classification. Only one or fewer specialized indicators are used, or only part of the soil is classified, such as by particle size composition, by plasticity index and by compressibility index. This classification has a narrow scope of application, but the division is clear and specific, and it is a supplement and development of the general classification.

3. Specialized classification. Classification based on the specific needs of certain parts of the project. It is closely integrated with the type of engineering building, and directly serves the engineering design and construction.

For example, water conservancy and hydropower, geology, industry and civil construction, transportation and other departments have corresponding soil classification standards, and promulgated in the form of norms, and uniformly implemented in their departments. Specialized classifications are complementary and development of general classifications in practical applications.