A Method of Controlling Subgrade Loading Rate by Observing Pore Water Pressure
A technology of pore water pressure and pore water pressure gauge, which is applied in the direction of roads, roads, infrastructure engineering, etc. to achieve the effect of easy operation
Active Publication Date: 2014-10-01
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0043] The pore water piezometer is embedded in the soft soil, and the soft soil will inevitably settle during the consolidation process. Undoubtedly, the position of the pore water piezometer will also change accordingly. How to measure the subsidence? What is the rate of sinking? Issues such as the influence of the subsidence of the pore water piezometer on the pore water pressure value have not yet been reported in relevant literature
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
example
[0070] The K118+250~k118+360 section of contract section 18 of Guangwu Expressway is a mountain on the left and a soft soil foundation on the right. Only pore water pressure is monitored for embankment loading. The design requirements monitoring indicators are: single-stage pore pressure coefficient <0.6, comprehensive pore pressure coefficient <0.4, settlement <10mm per day, and horizontal displacement <5mm per day before loading.
[0071] In this embodiment, it can be seen from the pore pressure curve that on March 18, the pore water pressure at the two hole measuring points exceeded the warning line. The suspension notice should have been issued, for the sake of prudence and to test the reliability of the "warning line", so the settlement rate and pore pressure coefficient of the day were calculated, and the results are shown in Table 2 and Table 3.
[0072] Table 2 Summary of Settlement Observation Data during Instruction Off-load Period
[0073]
[0074] Table 3 Calc...
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
Login to View More Abstract
The invention discloses a method for controlling a roadbed loading rate by observing pore water pressure. The method includes the steps: arranging and embedding pore water pressure gauges; connecting each pore water pressure gauge with a measuring device matched with the pore water pressure gauge; drawing a chart indicating the relation between the pore water pressure and time according to the measured relation between the pore water pressure and the time when a roadbed begins to be filled with earth and loaded; selecting two highest peak points on a pore pressure process line during initial loading, and connecting and extending the two highest peak points to serve as an early warning line for the pore water pressure; modifying the early warning line in a static load prepressing period after initial loading; and controlling subsequent earth filling speed according to the modified early warning line. The method avoids adverse effects of factors such as defects of static water pressure definition and difficult accurate quantification of earth filling increment in actual construction on pore water pressure coefficient values, and has the advantages of accuracy, intuition, easiness in operation and the like.
Description
technical field [0001] The invention relates to a highway construction project, in particular to a method for controlling the loading rate of a roadbed by observing pore water pressure. Background technique [0002] In expressway construction, the use of pore water pressure gauges to observe the process of pore water pressure rise and fall in soft soil under the action of external loads to control the loading rate has been used to a certain extent. [0003] The pore water pressure observation is carried out by means of a pore water pressure gauge. There are many types of pore pressure gauges, such as water pipe type, piezometric tube type, differential resistance type, etc. The steel string type pore water pressure gauge has the characteristics of good stability, high sensitivity, simple use, and convenience, so it is widely used. . The components and working principle of the steel string pore water pressure gauge are as follows: the main structure of the steel string pore...
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 Patents(China)
IPC IPC(8): E02D1/00E01C3/04
Inventor 吴定略卢自立陈瑞礼杨文亚
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG