Graded loaded sample preparation method of cement soil direct shear sample

Abstract

The invention relates to the field of civil engineering indoor geotechnical testing, and particularly relates to a graded loaded sample preparation method of a cement soil direct shear sample. A sample preparation device includes a pressure applying mechanism, a sample bearing mechanism, a supporting mechanism and a cutting mechanism; the sample bearing mechanism is mounted on the supporting mechanism; the pressure applying mechanism can cooperate with the sample bearing mechanism to apply pressure to the cement soil to obtain a mother sample; and the mother sample is pushed from the sample bearing mechanism into the cutting mechanism and cut into a number of standard samples. After adopting the above scheme, a number of samples can be prepared at one time, the artificial error among the samples can be eliminated, and the actual stress condition of the cement soil on site can be simulated through the graded loaded sample preparation process, so that the test results are closer to the site conditions.

Description

technical field [0001] The invention relates to the field of indoor geotechnical testing of civil engineering, in particular to a method for preparing samples of cement-soil direct shear samples loaded in stages. Background technique [0002] With the economic development of coastal areas, more and more buildings need to be built on soft soil foundations. Soft soil Because of its high water content and poor bearing capacity, it is difficult to build large buildings in soft soil areas, and the treatment of soft soil foundations has become a problem that the construction industry must face. In the method of strengthening soft ground, cement soil is widely used because of its low cost, strong practicability, little environmental pollution and fast construction speed. The water content in the soft soil and the mixing ratio of cement have a great influence on its shear strength, so it needs to be tested in laboratory tests. At present, the following problems are mainly encounte...

AI Technical Summary

Problems solved by technology

At present, the following problems are mainly encountered when testing the shear strength of cement soil indoors: ⑴. The soft soil has high water content, which is difficult to form when making cement soil samples; 2. In the direct shear test, multiple samples must be tested at a time. It is easy to cause large human errors between the samples by shearing and preparing samples in batches; (3) The cement-soil samples made by the hammering method cannot simulate the real stress of the cement-soil on the construction site, which makes the indoor test results There is a certain error with the real situation of cement and soil on site

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