Method for preparing frozen soil sample with high ice content at normal temperature
A condition, room temperature technology, applied in the field of preparing frozen soil samples with high ice content under normal temperature conditions, can solve the problems of under-saturation process, high equipment requirements, high cost, etc.
Pending Publication Date: 2020-10-27
卢四光
View PDF1 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
There was a patent (CN 102230856 A) which disclosed a relatively mature sample preparation method, using a mechanical hydraulic jack in a negative temperature laboratory to press to the required height by two-end compaction, but the equipment required for sample preparation High requirements and high cost (some equipment needs to be machined and customized separately), and no saturation process is carried out, which is not conducive to the extensive development of high ice content frozen soil experiments
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] In order to better illustrate the preparation process of the present invention, the following examples will be used for illustration.
[0025] Refer to the "Standards for Soil Test Methods" (GB / T 50123-2019) and use the pycnometer method to measure the specific gravity of the soil sample, and calculate the sample ratio. The measured specific gravity of this soil sample is 2.52 with a pycnometric bottle, and materials such as low-temperature dry soil and ice powder are prepared. In order to prevent personnel from frostbite and avoid excessive body temperature conduction to the prepared samples, the whole process of this method needs to be operated with gloves.
[0026] Prepare three cylindrical sand samples of the Beiluhe test section of the Qinghai-Tibet Railway, whose parameters are 125.0mm in height, 61.8mm in diameter, and 1.26g / cm in dry density 3 , Water content 40%.
[0027] Preparation of specimen preparation:
[0028] Pour liquid water into the ice tray and p...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| height | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a method for preparing a frozen soil sample with a high ice content at a normal temperature, which belongs to the technical field of frozen soil sample preparation, and comprises the following steps of(1) calculating dosage, (2) preparing raw materials, (3) carrying out layered compaction treatment, (4) saturating and freezing the sample, and (5) inspecting the sample. Themethod is simple in process, easy to operate, low in requirement for test places, capable of being used in a normal-temperature laboratory, low in cost, stable and controllable in test piece quality and accurate in test result. The mix proportion and the size of the sample can be flexibly adjusted according to test requirements, and reliable sample guarantee is provided for wide development of high-ice-content frozen soil mechanical tests.
Description
technical field [0001] The invention belongs to the technical field of frozen soil sample preparation, in particular to a method for preparing frozen soil samples with high ice content under normal temperature conditions. Background technique [0002] With the in-depth development of the western region, the construction of roads, railways and pipeline transportation projects in cold regions is increasing. For example, the Qinghai-Tibet Railway has a total length of 1925km and a length of 632km through permafrost regions, of which 221km is permafrost regions with high ice content. The mechanical properties of frozen soil in the foundation become extremely unstable with the change of temperature conditions, leading to subsidence and frost heave of the railway embankment, and these engineering geological problems will seriously affect the safe operation of the Qinghai-Tibet Railway. In order to solve these technical problems, a lot of research has been done on the mechanical an...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/42
CPCG01N1/28G01N1/42
Inventor 卢四光文茗袁海玲朱占元
Owner 卢四光