RU2419110C1 - Device for georadar estimation of soil bearing capacity - Google Patents

Abstract

FIELD: physics. ^ SUBSTANCE: soil is probed with georadar. Electromagnetic pulses are emitted into the medium by a transmitting antenna. Reflected signals are received by a receiving antenna. Said signals are converted to digital form. The converted signals are compared with reference signals. Each converted and compared signal is assigned soil bearing capacity. The soil bearing capacity is assigned in accordance with vehicle characteristics, soil type and weather-climatic conditions. Possibility of movement of the vehicle in real time is evaluated based on automated comparison results. ^ EFFECT: broader functional capabilities of the method of determining soil bearing capacity. ^ 1 dwg

Description

The present invention relates to the field of diagnostics of the state of soils and may find application in conducting surveys of the route of movement of vehicles off roads, along a route not prepared in advance.

Known penetration methods for determining the bearing capacity of soils of static and dynamic sounding [1, 2]. They are based on the determination of soil resistance characteristics based on the results of pressing various probes into the soil. Among the disadvantages are the following: penetration gives discrete values of the characteristics of the soil on the proposed route of movement of vehicles, i.e. at individual points on the route, which can lead to an underestimation of the possibility of movement on some sections of the route. Also, significant time costs are required to assess the bearing capacity of the soil.

It is also known that for geological and hydrogeological studies, studying the structure of roads, railway embankments, runways of airfields, determining the moisture content in the soil of the subgrade and underlying soil bases, subsurface sounding devices are used (in generally accepted terminology - georadars) [3].

The closest in terms of the totality of features is the method of engineering surveys of roads, which includes moving an all-terrain vehicle with a georadar and a satellite positioning system, which determines spatial coordinates and information about the location of the groundwater level according to the hydrogeological model of the area [4].

The problem to which the proposed device is aimed is to assess the possibility of movement (patency) of vehicles on the ground in current weather and climate conditions in real time based on georadar monitoring of the soil.

Georadar monitoring of the soil includes sounding the medium with electromagnetic pulses. The response of the medium - a set of waves that differ from each other by travel times, intensity and shape, contains information about the medium. The patency of the vehicle depends on the bearing capacity of the soil, which is within the zone of seasonal fluctuations in temperature and humidity, and is not constant for the same soil. The bearing capacity of the soil also depends on the density of the soil. The characteristics of electromagnetic pulses reflected by the ground medium (response of the medium) for soils under different weather and climate conditions (temperature and humidity conditions) and different densities of soils will be different. Therefore, if there is data on the bearing capacity of soils obtained experimentally by penetration and simultaneous georadiolocation of all types of soils under different weather and climate conditions (temperature and humidity conditions) and various soil densities, it is possible to obtain functional dependences "soil bearing capacity - a diagnostic sign of georadar location" , which determines the bearing capacity of the soil according to georadar.

The technical result is achieved by the fact that the georadar makes sounding of the soil, emitting pulses of electromagnetic radiation into the medium by a transmitting antenna. The reflected signals received by the receiving antenna are converted into digital form and compared with the basic signals, each of which is set in accordance with the mass-geometric characteristics of the vehicle, the type of soil and weather and climate conditions, the bearing capacity of the soil. Based on the results of automated comparison, the possibility of vehicle movement in real time is evaluated.

The essence of the proposed device georadar assessment of the bearing capacity of soils is illustrated by the structural diagram of the device shown in the drawing. The control unit, based on the initial information entered by the operator on the characteristics of the vehicle, the type of soil and weather and climate conditions, controls the processor. The transmitting antenna emits pulses of electromagnetic radiation generated in the signal conditioning unit into the medium. The received reflected signals by a receiving antenna amplified in a broadband amplifier are transmitted to a stroboscopic receiver, which allows for a layered examination of the medium, and an analog-to-digital converter, where they are converted to digital form. The digitized GPR signal is sent to the processor, which compares it with the basic values stored in the ROM. The ROM stores information on the bearing capacity of all types of soils under various weather and climate conditions (temperature and humidity conditions) and the corresponding diagnostic capability of a digital sign of ground penetrating radar. These data are determined experimentally - by penetration and simultaneous georadiolocation of all types of soils under various weather and climate conditions (temperature and humidity conditions) and different soil densities. Based on the results of an automated comparison carried out in real time, an assessment is made of the bearing capacity of the soil and the possibility of movement of vehicles is determined, which is displayed on the display unit.

The device for georadar assessment of the bearing capacity of soils allows you to assess the condition of the soil environment at almost every point on the road (the minimum sensing step can be only a few millimeters). The choice of the frequency of electromagnetic waves emitted into the soil environment provides the required sounding depth, which is selected depending on the mass-geometric characteristics of vehicles. Automated processing of GPR data allows real-time assessment of the bearing capacity of the soil environment of the vehicle’s driving route.

Information sources

1. GOST 19912-2001 Soils. Field test methods by static and dynamic sounding.

2. Methodological and reference materials on the engineering support of military operations. Tutorial. - M .: VA Strategic Rocket Forces, 1999 - 456 p.

3. A.V. Starovoitov. Interpretation of GPR data. M .: MSU. 2008.

4. Application for invention No. 99116757/03 of 07.30.1999, E01C 1/00, G01C 7/04 "Method for engineering surveys of roads".

Claims (1)

A device for georadar assessment of the bearing capacity of soils, based on a georadar survey of the soil environment, characterized in that the control unit, on the basis of predetermined initial information about the mass-geometric characteristics of the vehicle, the type of soil and weather and climate conditions, controls the process of examination of the soil environment, in which the soil medium signals electromagnetic radiation converted into an analog-to-digital converter in digital form, enter the processor, which compares them with the basic values stored in the ROM, in which the bearing capacity of the soil under various weather and climate conditions is associated with the interval of the digitized GPR signal, and based on the results of the comparison in real time, the bearing capacity of the soil is estimated, and determines the possibility of movement of vehicles, reflected on the display unit.