Determination of Blasting Vibration Safety Criterion for HDPE Pipeline Using Vibration and Strain Data in a Coastal Metro Line

A key aspect of urban blasting engineering is evaluating the safety of the blasting dynamic load on the adjacent high-density polyethylene water supply pipeline and controlling the negative impact of the blasting vibration load on the pipeline. According to the special characteristics of the soil layer in Shenzhen coastal city, a field blasting test of a full-scale pre-buried HDPE pipeline was carried out, and the distribution characteristics of the blasting vibration velocity and dynamic strain were analyzed. The finite element model was established by LSDYNA, and the reliability of the calculation model and parameters was verified by comparing with the field test data. At the same time, the dynamic response characteristics of pipelines with different buried depths, operating water conveyance pressures, and diameters under blasting vibration loads were studied. Combined with the circumferential allowable stress control criterion of the pipeline, the safety control standard of the blasting vibration velocity of the HDPE water supply pipeline under different working conditions was proposed. The results show that the circumferential compressive strain of the HDPE pipe is the most affected by blasting vibration, and the pipe with the shortest blasting center distance has the largest response. The vibration velocity and equivalent stress of the pipeline increase with the increase of buried depth, internal pressure, and diameter. The vibration velocity and equivalent stress of the explosion side at the same section of the pipeline are greater than those of the back explosion side. Based on the dimensionless analysis, the vibration velocity prediction model of the buried depth, operating pressure, and diameter of the pipeline is proposed. The safety control velocity of the pipeline is 25 cm/s, and the vibration velocity of the upper surface is 22.5 cm/s according to the Mises yield strength criterion.

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Safety Control of Blasting Construction in New Austrian Metro Tunnel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.2462 ◽

2012 ◽

Vol 446-449 ◽

pp. 2462-2465 ◽

Cited By ~ 1

Author(s):

Hong De Wang ◽

Xiu Feng Shen

Keyword(s):

Regression Analysis ◽

Vibration Monitoring ◽

Actual Condition ◽

Vibration Velocity ◽

Charge Weight ◽

Blasting Vibration ◽

Safety Control ◽

Blasting Excavation ◽

Tunnel Blasting ◽

Metro Tunnel

Abstract. Through the analysis and research on the vibration effect caused by the urban New Austrian (shallow embedded) metro tunnel blasting construction, the main harming effect of the blasting vibration on the surface buildings is summarized. According to the actual condition on the site of blasting construction in No.2 line of Dalian metro tunnel, the reasonable vibration monitoring plan for blasting vibration wave is established. At the same time, by means of the regression analysis about the monitoring results of blasting vibration, the vibration wave’s regression formula are set up, which can expression the correlation among the vibration velocity, the charge weight, the distance between the blasting fountains and the buildings. The results show that the Sadaovsk formula can be use to describe the effect of the metro tunnel blasting construction on the surface buildings accurately and reasonably in this construction segment. This kind of regression analysis method can be use to direct subsequent blasting excavation.

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Blasting Vibration Damping Design and Effect Analysis in Subway Shaft Construction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.501-504.1846 ◽

2014 ◽

Vol 501-504 ◽

pp. 1846-1849

Author(s):

Jin Kui Li ◽

De Jun Wang ◽

Yue Bo Fan

Keyword(s):

Optimization Design ◽

Ground Vibration ◽

Scientific Basis ◽

Surrounding Rock ◽

Vibration Monitoring ◽

Vibration Velocity ◽

Blasting Vibration ◽

Effect Analysis ◽

Safety Control ◽

Control Distance

Mining method inevitably causes a certain degree of damage on the shaft and surrounding rock, and severe vibration can effect on the ground buildings. The Sectional blasting design was discussed on the base of stratigraphic features, field condition and the nearest distance from surrounding buildings to Cuchun Shaft of Dalian Subway 202 construction which is taken as blasting safety control distance in this paper. The control blasting technology with short footage, weak blasting was put forward to reducing blasting vibration. The ground vibration monitoring was carried through during shaft blasting. Particle vibration velocity was from 0.28 to 1.85 cm/s and main vibration frequency was from 16.97 to 42.24 Hz at different level blasting of the surrounding rock. The monitoring results show the blasting parameters and damping measures can meet requirements of Engineering and standardization of the industry. It can provide the scientific basis and technical support for subway construction damping optimization design.

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Ensuring of irrigation machines application depth in uniformity’s distribution

Melioration and Water Management ◽

10.32962/0235-2524-2019-2-25-30 ◽

2020 ◽

pp. 25-30

Author(s):

Gennadiy Ol'garenko ◽

Boris Gordon

Keyword(s):

Water Supply ◽

Irrigation Depth ◽

Application Depth ◽

Water Supply Pipeline

A method of rain uniformity’s distribution was presented for different spraying devices, which were set on irrigation machines working in different mode of moving. A method for effective irrigation radius and width calculation was justified by using irrigation depth uniformity values from the area under water supply pipeline of the irrigation machine.

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Experiment and Analysis of Wedge Cutting Angle on Cutting Effect

Advances in Civil Engineering ◽

10.1155/2020/5126790 ◽

2020 ◽

Vol 2020 ◽

pp. 1-16

Author(s):

Deqiang Yang ◽

Xuguang Wang ◽

Yinjun Wang ◽

Huaming An ◽

Zhen Lei

Keyword(s):

Construction Cost ◽

Economic Benefits ◽

Tunneling Rate ◽

Vibration Velocity ◽

Utilization Rate ◽

Engineering Practice ◽

Blasting Vibration ◽

Cutting Depth ◽

Vertical Side ◽

Cutting Angle

In the process of tunnel excavation, large charge wedge cutting blasting is widely used to improve the effect of cut blasting and speed up the excavation rate, which is tantamount to increasing the construction cost. In order to save economic cost and improve cutting blasting effect, wedge cutting models with five different cutting angles were experimented and studied by using concrete materials on the basis of similarity theory analysis. The relationships among cutting depth, blasting volume, blasting fragment, and cutting angle are studied and deduced by the dimensional analysis method. The polynomial fitting of cutting depth, blasting volume, blasting fragment, and cutting angle is carried out according to the experimental data, and the corresponding fitting formula is obtained. The optimum cutting depth, hole utilization rate, blasting volume, and blasting fragment were obtained when the wedge cutting angle was 67° under the same charge. The values were 1.665 × 10−1 m, 92.5%, 8.390 × 10−3 m3, and 49.07 mm, respectively. With the use of TC4850N type blasting vibration meter, the blasting vibrations on the wedge in four directions are tested and analyzed. The results show that when wedge cutting inclination is 65 degrees, the peak vibration velocity is the minimum and the vibration intensity of the wedge cutting inclined side is generally smaller than that of the vertical side. Considering the cutting depth, blasting volume, blasting fragment, blasting vibration hazard, drilling error, tunneling construction cost, and other factors, the 65°∼69° wedge cutting blasting in engineering practice can improve the blasting tunneling rate and increase economic benefits. The experimental results show that the blasting tunneling rate is increased and the economic benefit is increased with the minimum construction tunneling cost, which has certain engineering significance.

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Influences of Tunnel Excavation Blasting Vibration on Surface High-Rise Building

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.2613 ◽

2010 ◽

Vol 163-167 ◽

pp. 2613-2617

Author(s):

Hai Liang Wang ◽

Tong Wei Gao

Keyword(s):

Vibration Frequency ◽

Vertical Vibration ◽

Frame Structure ◽

Vibration Monitoring ◽

Vibration Velocity ◽

Blasting Vibration ◽

Road Tunnel ◽

Concrete Frame ◽

High Rise ◽

Order Of Magnitude

According to the 33 floors high building, blasting vibration monitoring had been carried on. The building, along Yunnan road tunnel of Qingdao Cross-harbor Tunnel Guide Line Project, has concrete frame structure. Monitoring data had been analyzed. Results showed that rules of vertical vibration velocity and main vibration frequency have similar relevance. Amplification effect of them was existed on the middle and top of the building. From the 2nd floor of downward ground to ground, the value of them suddenly decreased. Main vibration frequency is in the range of 101~102 order of magnitude.

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Measurement of indoor environmental parameters and analysis of the condensation phenomenon in urban utility tunnels

Indoor and Built Environment ◽

10.1177/1420326x211056485 ◽

2022 ◽

pp. 1420326X2110564

Author(s):

Chuanmin Tai ◽

Guansan Tian ◽

Wenjun Lei

Keyword(s):

Water Supply ◽

Surface Temperature ◽

Air Temperature ◽

Natural Ventilation ◽

Environmental Parameters ◽

Dew Point ◽

Control Mode ◽

Safe Management ◽

Environmental Test ◽

Water Supply Pipeline

Condensation is a major issue in the safe operation of utility tunnels. To address the condensation problem, the indoor air temperature, relative humidity (RH) and surface temperature in an urban utility tunnel in Jining were continuously measured, and the condensation conditions were surveyed and analysed. The results indicated that under natural ventilation conditions, the air temperature in the comprehensive cabin varied from 23.4°C to 24.5°C, the RH fluctuated between 86.4% and 95.3%, and the corresponding air dew point temperature (DPT) remained in the range of 22.2°C–22.9°C. The surface temperature of the water supply pipeline ranged from 17.8°C to 18.5°C, which was far lower than the DPT in the tunnel, resulting in serious condensation. A water supply pipeline with an anti-condensation design was developed based on environmental test data. A 25-mm-thick rubber plastic sponge insulation layer was used to thermally insulate the water supply pipeline, preventing further dew condensation. Furthermore, mechanical ventilation had little effect on reducing the RH in the tunnel and may actually cause dew condensation; therefore, a ventilation control mode was proposed in this study. These results are expected to provide basic data for further research and reference for the safe management of utility tunnels.

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Seismic Damage Assessment of Urban Water Supply Pipeline

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.316-317.723 ◽

2013 ◽

Vol 316-317 ◽

pp. 723-726

Author(s):

Jian Qun Jiang ◽

Xiao Wen Yao ◽

Yi Ting Lu

Keyword(s):

Water Supply ◽

Damage Assessment ◽

Longitudinal Direction ◽

Underground Water ◽

Seismic Damage ◽

Pipeline System ◽

Seismic Damage Assessment ◽

Water Pipeline ◽

Ground Condition ◽

Water Supply Pipeline

Water supply pipeline system is a key issue in urban lifeline engineering, and the seismic assessment for the system damage is of significant importance. In this study, method of seismic damage assessment on underground water supply pipeline is introduced. With emphasis on the uncertainties of earthquake level, ground condition, soil-pipe interaction and capacity to resist pipe deformation in longitudinal direction, the check point method is applied to the reliability study of water pipeline, and a case study is presented to show the implementation of the proposed model.

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Analysis of Propagation and Distribution Characteristics of Leakage Acoustic Waves in Water Supply Pipelines

Sensors ◽

10.3390/s21165450 ◽

2021 ◽

Vol 21 (16) ◽

pp. 5450

Author(s):

Yunfei Li ◽

Yang Zhou ◽

Ming Fu ◽

Fan Zhou ◽

Zhaozhao Chi ◽

...

Keyword(s):

Acoustic Wave ◽

Water Supply ◽

Acoustic Waves ◽

Simulation Analysis ◽

Acoustic Signals ◽

Detection Methods ◽

Acoustic Analogy ◽

Acoustic Wave Propagation ◽

Source Characteristics ◽

Water Supply Pipeline

Leakage detection methods based on the analysis of leakage acoustic signals provide an effective technical approach for detecting small leaks in water supply pipelines. From a technical perspective, the study of the propagation characteristics of acoustic waves generated by the leakage in the water supply pipeline is necessary for detecting the leak location on the basis of acoustic signals. In this study, a 3D transient leakage acoustic wave propagation equation was derived by combining the principles of fluid dynamics and Lighthill acoustic analogy theory. The propagation of the leakage-induced noise in water supply pipeline was modelled theoretically. We simulated the propagation of a leakage acoustic wave under different conditions for different target scenarios encountered in actual pipeline inspections. Specifically, we analysed the effect of different factors, such as the pipe size and acoustic source characteristics, on acoustic propagation. Finally, the simulated experiments were practically performed using a self-designed simulated water supply pipeline and self-developed spherical water supply pipeline detector to validate the simulation analysis. The results of this study provide a theoretical guidance and basis for the analysis of characteristics of leakage acoustic wave signals and the recognition of leakage conditions in water supply pipelines.

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