Method and device for preparation of root-containing soil samples and testing of shear strength
A technology for sample preparation and shear strength, applied in the field of shearing instruments, can solve problems such as difficult preparation of samples with roots, and achieve the effects of good sample integrity, accurate shearing force, and reduced difficulty
Inactive Publication Date: 2020-09-08
HUBEI POLYTECHNIC UNIV
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Problems solved by technology
[0003] Technical problems to be solved: For the size of the test piece, the inner diameter and height of the shear test piece should be freely adjustable; the load range of the thrust and vertical pressure of the shear surface should be increased and accurately adjusted; the real-time dynamics of the shear surface The shear strength calculation error caused by the change should be eliminated; solve the problem of difficult preparation of root-containing samples
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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0021] The traditional shear test device was rationally improved, the calculation formula of shear strength was redefined, and the production method and equipment of root soil samples were designed. The main differences between the improved test device and the traditional shear test device are the redesigned shear box, enhanced horizontal loading system, adjustable vertical stress loading system, and dynamic electronic data acquisition system. At the same time, a special sample preparation box with roots and a compacting device for samples with roots are designed.
[0022] figure 1 , figure 2 S...
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Abstract
The invention discloses a method and device for preparing soil samples containing roots and detecting shear strength. The sliding seat is installed on the upper end of a ball chute, and a shearing box is fixedly connected to the sliding seat. There is a vertical pressure rod, one side of the shear box is connected with a horizontal push rod, and the other side is connected with a dowel rod, and a load cell is arranged on the dowel rod. At the same time, the invention also discloses a root-containing soil sample preparation device. The sample preparation box includes a lower bottom plate, a side plate and an upper pressure plate. The lower bottom plate and the side plates are fixed to each other to form a cavity, and the upper pressure plate is slidably fitted in the cavity. In the body, a plurality of slots are arranged on the lower bottom plate, each slot is detachably connected with a piercing steel pipe, and an avoidance hole for avoiding the piercing steel pipe is arranged on the upper pressing plate. The invention is simple in structure and easy to use, and the improved shearing test device can overcome the disadvantages of the traditional shearing test device, reduces the difficulty of processing and forming the test piece, and the shearing force calculated by the collected data is more accurate.
Description
technical field [0001] The invention relates to a shearing instrument suitable for detecting the shear strength of root-containing soil and its matching shear force calculation formula, as well as the corresponding manufacturing process and equipment for root-containing soil samples, in particular to a device that can adjust the size of the test piece The shearing instrument and the calculation formula considering the real-time change of the shearing surface. Background technique [0002] Plants are widely used in green protection projects of various types of slopes. The interaction between plant roots and soil is the key factor to increase the stability of the slope surface soil layer, and the shear strength of the root soil is an important factor for the stability of the soil layer. As for the control index, there is no test instrument and test preparation process specially suitable for measuring the shear strength of soil with roots at present, and only traditional shear ...
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IPC IPC(8): G01N1/28G01N3/24
CPCG01N1/286G01N3/24G01N2203/0048G01N2203/0075G01N2203/0284
Inventor 张定邦程涛孟鸳曹志国严海安秦立平缑勇杨友全陈易陈爱清
Owner HUBEI POLYTECHNIC UNIV