In-situ lateral earth pressure measuring device and method

Abstract

The invention discloses an in-situ lateral earth pressure measuring device and method. The device comprises a measuring part and a control part. The measuring part comprises a measuring tube and an air bag. The top of the measuring tube is positioned by an adjustable clamp in order that the measuring tube and a measuring hole are coaxial. A guide rail is arranged on the inner sidewall of the lowerend of the measuring tube. A plurality of electromagnetic balls are distributed in the circumferential direction of the top of the air bag and can slide along the guide rail at the lower end of the measuring tube. An air guiding device is disposed at the center of the air bag. The upper interface of the air guiding device is connected to an air guiding tube. The air guiding tube extends out of the measuring tube to uniformly fill the air bag with air. A plurality of strain sensors are distributed on the sidewall of the air bag. The control part comprises a control box and a gas storage tank.The control box controls the amount of air introduced into the air bag by the air storage tank so as to calculate the expansion volume of the air bag. The controller receives the feedback signals of the strain sensors to show a stress and strain value relation curve of the lateral earth pressure. The air storage tank is connected to the air guiding tube and is the air source of the entire measuring device.

Description

technical field [0001] The invention relates to an in-situ earth pressure measuring device, in particular to a lateral earth pressure measuring device and a measuring method. Background technique [0002] In engineering design and safety assessment, the earth pressure of the interaction between soil and structure is a crucial factor. Most of the earth pressure measurement is vertical pressure measurement, but the measurement of lateral earth pressure is relatively difficult, and special measuring devices need to be designed for measurement. [0003] Most of the existing measurement methods are pre-embedded pressure cells by drilling, then filling the same or similar soil and compacting to measure the soil pressure, and the measurement of lateral earth pressure requires the design of special pressure cell installation equipment to obtain relatively accurate value. The existing method has the following defects: [0004] 1. After the pressure box is buried in the soil, it is...

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Problems solved by technology

[0004] 1. After the pressure box is buried in the soil, it is generally not recyclable, and there is a serious waste;

[0005] 2. When measuring the lateral earth pressure, the pressure cell needs to be buried in the soil through special installation and fixing equipment, so that the measurement surface can correctly contact the soil. However, due to the backfill or excessive disturbance of the soil, the measurement position is unstable and serious. Affect the measurement accuracy;

[0006] 3. Although the backfill soil after soil drilling is mostly configured according to the original soil properties, it is still not the original soil layer. In addition, the pressure relief and disturbance of the soil after backfilling soil, the accuracy of the measured lateral earth pressure is not high

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