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Saturated clay sample strength and strain softening parameter measuring device based on full-flow penetration

A technology of parameter measurement and strain softening, applied in the field of geotechnical, geological and environmental research, can solve the problems of unmeasured soil parameters, difficult soil reflow, etc., and achieve the effect of expanding the scope of application of soil strength measurement

Active Publication Date: 2018-12-18
DALIAN UNIV OF TECH
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Problems solved by technology

However, for a soil with a certain strength, the pressure of the overlying soil on the soil is artificially eliminated after the segmental interception, so that the soil forms a cavity behind the probe during the penetrating process, and it is difficult for the soil to completely reflow. Unable to measure parameters of the soil

Method used

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  • Saturated clay sample strength and strain softening parameter measuring device based on full-flow penetration
  • Saturated clay sample strength and strain softening parameter measuring device based on full-flow penetration
  • Saturated clay sample strength and strain softening parameter measuring device based on full-flow penetration

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Embodiment

[0024] First, assemble the experimental setup. Workbench 1 is placed on a flat ground, and the pressure loading system is leveled; according to the permeable stone, geotextile, and filter paper, first lay on the bottom of the rigid box, and add an appropriate amount of distilled water to make the water surface exceed a certain height of the filter paper, and open the drain valve 16 , make it close when the water flows out, and drain the gas below the water surface; cut the columnar soil sample to be tested according to the size of the rigid box and place it in the rigid box 8, and then place the hole with the size of the probe from bottom to top Saturated filter paper and geotextile; pass the measuring rod of the full-flow penetrometer 7 through the sealable hole 14 of the top cover, and place it statically on the surface of the soil; connect the annular pressure frame 4 and the annular steel ring 6 with steel rods , transferred to the rigid box movable top cover 12 top surfac...

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Abstract

The invention discloses a saturated clay sample strength and strain softening parameter measuring device based on full-flow penetration, and belongs to the technical field of geotechnical, geology andenvironment research. The device mainly comprises two parts, namely, an overlying pressure loading system and a full-flow penetration system. Mainly for the problem of incomplete backflow of a soil body in a process of measuring soil body strength and strain softening parameters of a saturated clay by applying a full-flow penetrometer, by applying a working principle of a traditional consolidometer, the backflow of the soil body is guaranteed through vertical pressurization of a soil sample, so that the applicability of the full-flow penetrometer in the aspect of soil body strength and strainsoftening parameter measurement is improved, and an important practical value is achieved for experimental research and marine engineering design. The device can be applied to the measurement of laboratory soil samples and undisturbed soil samples in marine exploration, so that the undrained shear strength of the soil samples, the soil body strength after sufficient disturbance and the softeningparameters of the soil body are obtained. Finally reliable soil body material parameters are provided for design and stability evaluation of facilities such as seabed pipelines, ocean foundations andthe like.

Description

technical field [0001] The invention belongs to the technical field of geotechnical, geological and environmental research, and relates to a device for measuring the strength and strain softening parameters of saturated clay samples based on full-flow penetration testing. Background technique [0002] The measurement of seabed soil strength parameters is the basis of all marine geotechnical engineering design and analysis. With the increasing development of deep-sea oil and gas and offshore engineering, for the rational design and stability evaluation of engineering facilities such as oil and gas drilling platforms, submarine pipelines, and submarine cables, in-situ tests, laboratory measurements, and the mutual cooperation and verification of the two are important. The main determination method of soil parameters in actual engineering. Among them, on-site sampling, as part of the marine geological survey, is one of the important means to obtain the original state of the se...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/08E02D1/02
CPCE02D1/022G01N3/02G01N3/08E02D1/025G01N1/286G01N3/40G01N33/24G01N2203/0005G01N2203/0284G01N3/48G01N2203/0019G01N2203/0032
Inventor 于龙韩云瑞杨庆王忠涛
Owner DALIAN UNIV OF TECH
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