SU390407A1 - DEVICE FOR RESEARCH OF DEFORMATION PROPERTIES OF SOIL IN WELLS - Google Patents

Description

one

The device is designed to investigate the construction properties of the soil.

Devices are known for studying the deformation properties of soils in wells, including a pressure agent, a hydraulic system, measuring and loading devices with a radial expansion jack. Such devices cannot investigate the deformation properties of the soil in three mutually perpendicular directions in one well and at one point of the studied soil mass, which leads to insufficiently accurate measurements.

In order to eliminate this drawback in the proposed device, the loading device is made with a hollow glass and an axial jack mounted between the radial spreading jacks, and the measuring device has guide rods mounted on the load device passed through the holes in the disks and connected to the latter by springs , and each disc is made with a clamping jack.

FIG. 1 schematically shows the proposed device; in fig. Figure 2 shows the load and measurement tools in the well.

The device contains a pressure driver, for example, a pumping station /, a hydraulic system 2, a measuring station 3, a winch 4 with a cable 5, a loading device with radial-expansion jacks 6, a hollow cup 7 and an axial jack 8, a measuring device with guide rods 9 and discs 10, springs 11, connecting rods with discs, clamping jacks 12, sensors 13 radial and 14 vertical deformations.

The assembled device on the cable with the help of a winch is lowered to the desired elevation in the well, the hydraulic system from the pumping station is connected to jacks 6, 8 and 12, the strain gauges are connected to

measuring station. Then, pressure is applied to the working cavities of the jacks 6, while the elastic shell of these jacks is stretched and the segments of the outer shirt are pressed against the walls of the well. At the same time, pressure is applied to the cavity of the jacks 12, while the disks 10, which are held apart by the jacks 12, are also pressed against the walls of the well. Radial soil deformations are detected by sensors 13, the signal from which enters the measuring station. The pressure in the system is recorded by a manometer installed at the pump station. After the well deformations stabilize in the radial direction, the pressure in the jacks 6 is not relieved, pressure is created in the jack 8, which is through the cup 7, the length

which can be chosen arbitrarily depending on the purpose of the study, transmits pressure to the outer jackets of the included jacks 6, acting along the axis of the well on its walls and deforming them. When this occurs, the disks 10 shift, the change in the distance between them, which characterizes the vertical deformation of the borehole walls, is sensed by the sensors 14 connected to the disks.

Subject invention

Device for the study of the deformation properties of the soil in wells, including

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A pressure-sensing agent, a hydroconductive system, measuring and load devices with a radial-expansion jack, characterized in that, in order to improve measurement accuracy, the load-bearing device is made with a hollow cup and an axial jack mounted between the radial-expansion jacks, and the measuring device has rods mounted on the load device, passed through the holes in the disks and connected to the latter by means of springs, each disk n with clamping jack.

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