Dilatometer for Measuring Expansion Force by Constant Volume Method

Abstract

The invention discloses a dilatometer for measuring the expansive force by a constant volume method, and relates to geotechnical test apparatuses. According to the structure of the dilatometer, a fixing system is connected with a measuring system, the fixing system comprises a fixing base, circular steel columns, a square crossbeam with a hole, a knob, a lower permeable stone, an upper permeable stone, a cutting ring fixing cylinder, a cutting ring, a nut, and a gasket, and the measuring system comprises a pressure sensor, a data display meter, a computer, and a dial gauge. The dilatometer is advantageous in that 1) constant volume: the volume of a soil sample in the whole test process is invariable; 2) high precision: the pressure sensor is advantaged by high precision and large measuring range, and the precision of test results is improved; 3) wide range: the dilatometer is applicable to measurement of the change of the expansive force in the soaking process of the soil sample and with the change of the environmental humidity condition and the test of the expansive force under the temperature control; and 4) the structure is good, the installation is convenient, the operation is simple, and the data display is visual.

Description

technical field [0001] The invention relates to a geotechnical engineering test instrument, in particular to a dilatometer for measuring expansion force by a constant volume method, which is suitable for expansive soil. Background technique [0002] Expansive soil is distributed in more than a dozen provinces and cities in my country, and the distribution range is very wide. In recent years, with the development of the national economy, there are more and more engineering constructions in our country, and the problem of expansive soil in the construction of expressways and channels has become more and more prominent, often causing engineering disasters such as roadbed deformation and slope instability. , therefore, how to accurately measure the expansive soil expansive force is of great significance. [0003] The current measurement methods of expansion force include: expansion back pressure method, balanced pressurization method, pressurized expansion method and constant v...

AI Technical Summary

Problems solved by technology

Although the balanced pressurization method is close to its definition, it is difficult to control in actual operation, because it is difficult to determine how much load is applied during the expansion process to just balance its volume

However, many studies have found that the expansion force measured under the condition of constant volume of unsaturated soil has physical significance and practical value; in view of the fact that the existing constant volume method measurement method is difficult to achieve constant volume, the measured value is too large or too small

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