A device for measuring strain and volume of a soil sample including an enclosure adapted to receive a soil sample within another enclosure. A base adapted to hold the sample enclosure. The device also has a plurality of moveable arms located between the enclosures which may be a spaced distance apart and adapted to move around the sample. Cameras as included on the arms.

A method for determining a physical similarity simulation material of a solid backfill body is provided. A compaction test is run on a gangue backfill body in a lab, to obtain a - curve regarding the gangue backfill body in the compaction process. Backfill blocks are made by using a thin wood board, sponge, and a paper sheet in different proportions, and then an unconfined compression test is separately run on the backfill blocks used for physical similarity simulation, to obtain .sub.i-.sub.i curves regarding the backfill blocks in the compression process. A sum of squared errors (.sub.i.sub.0).sup.2 is introduced to separately calculate a sum of squared errors of the backfill block and that of the gangue backfill body, and accordingly an error between - curves regarding the test block and the gangue backfill body is determined. Finally, a backfill block for which the sum of squared errors is less than 0.5 is determined as a physical similarity simulation material of the gangue backfill body. By fabrication and selection of similar materials, the present invention can reduce an error caused by a selected backfilling material during a physical similarity simulation experiment, guaranteeing the accuracy of the physical similarity simulation experiment for solid backfill mining.

The invention concerns a tablet press (10) which is typically portable and comprises a base (12) and a press member (24) held relative to the base by a spacer (20). The base (12) comprises a die (38B) for receiving a powder in use, wherein the spacer (20) depends from the base and is moveable relative thereto under the control of an actuator (28) such that the press member (24) is reversibly actuable between an at-rest condition in which the press member is spaced from the die and an actuated condition in which the press member is located in the die so as to apply a load to a powder therein so as to compact the powder into a tablet. The actuator is operated under the control of an electronic controller, typically in response to desired tablet parameters input by a user. A table-top tablet press of this kind is particularly beneficial for individual or small-batch tablet production, for example for research purposes.

The invention relates to a rheometer comprising of a container for receiving a material sample to be investigated, a shaft with a rotating body which is immersed into the material sample, and a container lid that moves in the axial direction of the shaft into the sample container to deliver consolidating stress to the material sample. The forces acting on the material sample due to the rotation of the rotating body and the motion of the container lid and the location of the sample lid are measured as consolidating stress and rotational strain are applied and removed from the material sample.

An apparatus for measuring a degree of cure and a specific volume of a packaging material is provided, including: an upper load module configured for driving the rotation of an upper ball screw via an upper servo motor such that a force plate coupled to the upper ball screw moves downward and is thus positioned; a lower load module having a lower ball screw operating and moving via a lower servo motor such that a load joint group connected to the lower ball screw generates a corresponding displacement; an upper film cavity module connected to the upper load module; and a lower film cavity module disposed on the lower load module. The displacement of the load joint group enables a push rod to move upward. A heating pipe keeps constant the temperature of a subject to be measured in a cavity of the lower film cavity module.

A device for measuring strain and volume of a soil sample including an enclosure adapted to receive a soil sample within another enclosure. A base adapted to hold the sample enclosure. The device also has a plurality of moveable arms located between the enclosures which may be a spaced distance apart and adapted to move around the sample. Cameras as included on the arms.

A method for determining a physical similarity simulation material of a solid backfill body is provided. A compaction test is run on a gangue backfill body in a lab, to obtain a - curve regarding the gangue backfill body in the compaction process. Backfill blocks are made by using a thin wood board, sponge, and a paper sheet in different proportions, and then an unconfined compression test is separately run on the backfill blocks used for physical similarity simulation, to obtain .sub.i-.sub.i curves regarding the backfill blocks in the compression process. A sum of squared errors (.sub.i.sub.0).sup.2 is introduced to separately calculate a sum of squared errors of the backfill block and that of the gangue backfill body, and accordingly an error between - curves regarding the test block and the gangue backfill body is determined. Finally, a backfill block for which the sum of squared errors is less than 0.5 is determined as a physical similarity simulation material of the gangue backfill body. By fabrication and selection of similar materials, the present invention can reduce an error caused by a selected backfilling material during a physical similarity simulation experiment, guaranteeing the accuracy of the physical similarity simulation experiment for solid backfill mining.

Embodiments of the present disclosure provide a test apparatus for pile-soil interface shear mechanical properties, comprising a support device, a pressure device, a membrane box, and a thrust device, wherein the support device comprises a bottom plate, a top plate, a support beam, and a plurality of bracing struts, the bottom plate and the top plate being both provided with a through-hole for inserting a model pile. The test apparatus for pile-soil interface shear mechanical properties according to the present disclosure has a simple structure and is easy to operate, which may accurately simulate mechanical properties of pile soils having different types of piled foundations in actual works, thereby facilitating researches on pile-soil testing.

A funnel control device is fixed on a shear box or respective cells in various soil mechanics/dynamics testing devices, and the funnel control device enables to produce soil samples to be tested by discharging a soil through a funnel into a sample preparation mold at a given axis and rate. The funnel control device includes at least one supporting body for being placed on the soil mechanics/dynamics testing device, at least one holder, wherein the at least one holder is provided on the at least one supporting body to be movable in vertical axis and the funnel is placed on the at least one holder, at least one driving member, wherein the at least one driving member is located in or on the at least one supporting body and is used for moving the at least one holder in the vertical axis.

The invention provides a method and device for measuring the elasticity of hardened cement for cementing of oil-gas wells. The measurement method comprises: determining the loading and unloading rates of the hardened cement; determining the maximum loading on the hardened cement; determining the experimental temperature and the experimental pressure of the hardened cement; establishing a stress-strain curve for the hardened cement; and describing the elasticity of the hardened cement with the degree of strain recovery of the hardened cement in different cycles, and describing the mechanic integrity of the hardened cement with the degree of damage to the hardened cement in different cycles. The invention further provides a device for measuring the elasticity of hardened cement for cementing of oil-gas wells. The measurement method and device of the present invention provide a universal comparing platform for research on hardened cement modification as well as examination of domestic and foreign special cement slurry systems, which is of great significance in evaluation of well hole integrity and well life.