Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for predicting the formation range of subgrade voids induced by municipal pipeline holes

A technology of municipal pipeline and prediction method, which is applied in the field of prediction of subgrade cavity formation range induced by municipal pipeline damage, can solve the problems of predicting the formation range of subgrade cavity induced by municipal pipeline damage, and has not been seen, so as to achieve convenient implementation, reliable results, The effect of simple process

Active Publication Date: 2019-01-22
FUJIAN UNIV OF TECH
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no method for predicting the scope of subgrade cavity formation induced by damage to municipal pipelines

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for predicting the formation range of subgrade voids induced by municipal pipeline holes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] Such as figure 1 As shown, a method for predicting the formation range of subgrade voids induced by municipal pipeline holes includes the following steps: (1) draw a simulation map; (2) determine the water pressure U at the hole in the pipeline (namely at point O); (3 ) to determine the immersion range of the overlying sand at the hole: the immersion height at the hole d=U / γ w , where γ w is the gravity of the water body, taking the center of the hole as the center and d / 2 as the radius, draw a semicircle above the pipeline, and the area within the intersection line between the semicircle and the pipeline is the water immersion range of the overlying sand; (4) Determine the sand The underwater internal friction angle φ of the soil ， and the internal friction angle φ on the water; (5) Determine the boundary of the hole: from the boundary points A and B on both sides of the hole position, draw obliquely upwards and the horizontal plane at an angle of φ ， The two straig...

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

No PUM Login to View More

Abstract

The invention relates to a method for predicting the formation range of subgrade voids induced by municipal pipeline holes, comprising the following steps: (1) drawing a simulation diagram; (2) determining the water pressure U at the broken pipe hole; (3) determining the immersion range of the overlying sandy soil at the broken hole; (4) determining an underwater internal friction angle phi of thesand soil and an overwater internal friction angle phi of the sand soil; (5) determining the boundary of the hole: drawing a straight line from the boundary points A and B with the included angle phito the horizontal plane; drawing rays vertically upward from point C and point D respectively; drawing a line segment with a length of 0.3 h horizontally outward from a point E and a point F, drawingA ray vertically downward from a point G and a point I, respectively, The polygon ABDKIGJCA being the cross-sectional area of the roadbed cavity when the two straight lines intersect with the two rays from point G and point I at point J and point K at an angle of 45 DEG + phi / 2 to the horizontal plane from point C and point D, respectively. The prediction method of the invention has the advantages of simple flow, strong operability and reliable result.

Description

technical field [0001] The invention relates to a method for predicting the formation range of subgrade cavities induced by municipal pipeline holes, belonging to the field of urban geological disasters. Background technique [0002] There are many municipal pipelines buried underground in modern cities in my country, including rainwater, sewage and tap water pipelines. Most of these pipelines are set under the roads and buried by trenching and backfilling. However, with the increase of service time, due to the aging of materials and construction methods, many pipelines are prone to quality problems when the design service life is exceeded, such as cracks and collapses above the pipeline. Once similar problems occur, the soil on the top will be backfilled It is easy to fall into the interior of the pipeline, and is continuously taken to the downstream position under the action of water flow, forming a cavity above the pipeline. The upper cavity gradually expands under the a...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06F17/50
CPCG06Q10/04G06F30/20
Inventor 陈华艳罗才松叶建峰郑居焕
Owner FUJIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com