scholarly journals Effect of Grouting Reinforcement on Settlement of Existing Tunnels: Case Study of a New Crossing Underpass

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 482
Author(s):  
Yongjie Qi ◽  
Gang Wei ◽  
Yu Xie ◽  
Qin Wang
Keyword(s):  
Stress Reduction ◽  
Soil Layer ◽  
Element Model ◽  
Vertical Displacement ◽  
Foundation Soil ◽  
Settlement Calculation ◽  
Before And After ◽  
Grouting Reinforcement ◽  
Change Trend

In the construction of the new shield tunnels crossing existing tunnels, grouting rings are often installed in the existing tunnels for protection. To study the effect of grouting rings on the settlement of existing tunnels, the variations of soil properties and relevant parameters before and after the grouting are analyzed. By considering the effect of the grouting ring on the reduction of the stress and the reinforcement of the surrounding foundation soil, the stress reduction model of the heterogeneous soil layer and the model of the tunnel settlement calculation are proposed. The formula for the reduction of the stress after passing through the grouting ring is deduced. Moreover, by comprehensively taking the influences of the shield excavation and grouting ring into account, the formula for calculating the vertical displacement of the existing tunnel caused by the excavation of the new tunnel is derived. Further, the impacts of the length and the thickness of the grouting ring on the settlement of the existing tunnel are studied. The results of the theoretical calculation method proposed herein are well consistent with the data computed by the finite element model, and both follow a relatively similar change trend. According to the obtained results, installing the grouting ring on the existing tunnel can effectively reduce the tunnel settlement. Finally, the results demonstrate that increasing the length and the thickness of the grouting ring can strengthen the protection of the existing tunnel, but the effect gradually decreases.

Study of Grouting Reinforcement to Disturbance Soft SOIL Caused by Large Diameter Slurry Shield Construction

2013 ◽  
Vol 790 ◽  
pp. 401-404
Author(s):  
Jian Ming Zhu ◽  
Hai Feng Cheng
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Large Diameter ◽  
Soil Layer ◽  
Element Model ◽  
Vertical Displacement ◽  
Soil Disturbance ◽  
Finite Element Software ◽  
Grouting Reinforcement ◽  
Slurry Shield

Study of grouting reinforcement to disturbance soft soil caused by large diameter slurry shield construction based on Jiangyin Chengjiang West Road over the river tunnel project. First, Three-dimensional finite element model is created to use the ABAQUS finite element software, considering nonlinear deformation of soil in the numerical calculations. By numerical simulation: horizontal, vertical, vertical displacement trends are in accordance with the measured data; increase the layer E, C, φ values can effectively reduce the settlement of soft soil layer, reducing the soil disturbance. Therefore, through grouting reinforcement of upper soil can reduce soil settlement and get to the purpose of reducing the soil disturbance.

scholarly journals Investigating the Qualities of a Recreational Forest: Findings from the Cross-Sectional Hallerwald Case Study

2020 ◽  
Vol 17 (5) ◽  
pp. 1676 ◽  
Author(s):  
Renate Cervinka ◽  
Markus Schwab ◽  
Daniela Haluza
Keyword(s):  
Citizen Participation ◽  
Perceived Stress ◽  
Stress Reduction ◽  
Well Being ◽  
Cross Sectional ◽  
Convenience Sample ◽  
Before And After ◽  
As Stress ◽  
Health And Well Being

Prior research shows that forests contribute to human health and well-being. In this sense, this cross-sectional case study, adopting the principles of citizen science, assessed the restorative potential of places in the Hallerwald, an Austrian community forest. A convenience sample of adult forest visitors (n = 99, 64% females) completed a survey during a guided 2.5 h forest tour. The German questionnaire assessed the qualities of defined places in the forest. We also investigated changes in mood states, perceived stress, restoration, connectedness, and mindfulness before and after visiting the forest. In cooperation with a local working group, we developed the new Widen One’s Mind (WOM) scale, which showed good scale characteristics. All places received high scores in their potential to increase restoration and vitality and to widen one’s mind. Positive affect, restoration, connectedness with nature and the forest, and mindfulness increased pre- versus post-visits, whereas negative affect and perceived stress decreased. The findings of this study suggest that in recreational forests, visitors experience beneficial mental effects such as stress reduction in addition to physical exercise. To facilitate regional development goals, we recommend evaluating places in forests regarding the potential effects on the health and well-being as well as citizen participation before initiating extensive remodeling.

The Influence of Attitudes, Subjective, Norms, and Behavior Controls on Intention to Choose Islamic Banks With Islamic Religiosity as a Moderating Variable (Case Study at Bri Syariah Purwokerto Customers)

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Akhmad Khoyrun Najakh ◽  
Dwiwiyati Astogini ◽  
Sri Martini
Keyword(s):  
Behavioral Control ◽  
Sampling Technique ◽  
Subjective Norm ◽  
Subjective Norms ◽  
Islamic Banks ◽  
Control Behavior ◽  
Before And After ◽  
And Behavior ◽  
Number Of Customers

The purpose of this study was to analyze the influence of attitudes on the intention to choose Islamic banks, to analyze the effect of subjective norm on the intention to choose Islamic banks. to analyze the effect of the control behavior of the intention to choose the Islamic banks, to analyze the moderating influence of religiosity on the relationship attitudes, subjective norms and behavioral control of the intention to choose the Islamic banks . The method used is a survey with a sampling technique used purposive sampling with a sample size of this study was 100 respondents . Further analysis tools used in this study is multiple regression analysis using SPSS 16.0 software . Based on this study it can be concluded that the attitude does not affect to the intention of choose Bank BRISyariah. Subjective norm positive effect on intention choose Bank BRISyariah. Control behavior does not affect to the intention choose Bank BRISyariah. Relationship between Attitudes, Subjective Norms and Behavior Control with the intention to select Bank BRISyariah not moderated by religiosity.Based on these conclusions can be said that the Bank BRISyariah should improve understanding related to the subjective norm in order to increase the number of customers who use the services of Islamic Banking . Further research is recommended in order to follow up and develop this research to further explore the independent and dependent variables continued before and after behavioral intention or intention to perform a specific action .

Impact of merger on efficiency and productivity : a case study of commercial banks in Malaysia

1970 ◽  
Vol 5 (1) ◽  
pp. 77
Author(s):  
Mahadzir Ismail ◽  
Saliza Sulaiman ◽  
Hasni Abdul Rahim ◽  
Nordiana Nordin
Keyword(s):  
Efficiency Score ◽  
Malmquist Productivity Index ◽  
Productivity Index ◽  
Data Envelopment ◽  
Master Plan ◽  
Before And After ◽  
Domestic Banks ◽  
The Impact ◽  
Efficiency And Productivity

The Financial Master Plan (2001- 2010) aims to enhance the capacity of banking industry so that higher effic iency and productivity can be reaped in the future. This study seeks to determine the impact of merger on the efficiency and productivity ofcommercial banks in Malaysia for the period 1995 until 2005. The study uses a non-parametric approach, nam ely DEA (data envelopment analysis?) to estimate the efficiency scores and to construct the Malmquist productivity index. To enable this estimation, three bank inputs and outputs are used. Amongst the findings are those banks exhibit higher efficiency score after the merger and thefo reign banks are more efficient than the local banks. Productivity of the banks is calculated in both periods, before and after the merger: The results show that, it is the local banks that have improved the most after the merger. The main source of productivity is technical change or innovation. The findings support the existing policy of having larger domestic banks in term of size.

ANALISIS EFEKTIVITAS PROGRAM USAHA AGRIBISNIS PERDESAAN (PUAP) SERTA DAMPAKNYA TERHADAP TINGKAT PENDAPATAN PETANI (STUDI KASUS PADA GABUNGAN KELOMPOK TANI TELUK JAYA)

2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Yudi Triyanto
Keyword(s):  
Poverty Alleviation ◽  
F Test ◽  
Income Levels ◽  
Before And After ◽  
Program Funding ◽  
Independent Variable ◽  
Farmer Income ◽  
Positive Effect ◽  
Group Association

Study the effectivity analysis of Program Usaha Agribisnis Perdesaan (PUAP) and its impact on farmer income levels (case study of the Teluk Jaya Farmers Group Association) aims to 1. knowing how large the effectivity of PUAP funds is for income levels in poverty alleviation in Teluk Desa Sentosa Panai Hulu Subdistrict, 2. to analyze and determine the level of income of Gapoktan Teluk Jaya Farming Business in Teluk Sentosa, Panai Hulu Subdistrict before and after receiving PUAP assistance. The results showed that the effectivity of PUAP program funding is very effective and good, it can be seen from the results of the F test of 12.406 with a significant level of 0.000 while the F value of the table is 2.051. When compared to the value of F test (12.406) > Ftable (2.051) at α 5%, it was concluded that simultaneously the effectivity variable and the PUAP program had a positive effect. The increase in income of the Teluk Jaya Farmers Group in Teluk Sentosa after receiving PUAP funds can be known from the t table for the effectivity variable of 2.663 and the PUAP program for 1.270 with a significant value for each independent variable (2.051); (0.073). Whereas for the t table value in the distribution statistics t table with the level of test α = 5% and df1 = 27 of 2,051. Based on the criteria that if the value is t count> t table); namely (2.663> 2,051) (1,270> 2,051) so that it can be concluded that the effectivity variable partially has a positive and significant effect on the income level.Keywords : effectivity variable,  income level, PUAP program

Obesity management through Ayurveda - A Case Study

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Dheeraj Kumar Tyagi ◽  
Shivakumar .
Keyword(s):  
Clinical Findings ◽  
Dietary Habit ◽  
Unhealthy Lifestyle ◽  
Lifestyle Management ◽  
Before And After ◽  
Effect Of Treatment ◽  
And Control

Lifestyle disorders are one of the biggest threats for the population living unhealthy lifestyle. Sthoulya (Obesity) is one such disorder which creates lot of physical as well as mental disorder to the sufferer. Due to changing lifestyle, comforts and dietary habit lots of individuals changed their life totally. Obesity is a growing disease in developed and developing countries. Prevalence is drastically hike in past few years. Ayurveda, the science of life with which we can manage and control lots of lifestyle disorders. Focusing on dietary and lifestyle management along with treatment, we can overcome the hazards of obesity which is growing in a uncontrolled manner. The available data is based on the clinical findings only. Aim and objective: To assess the effect of “Guru Cha Atarpanam Chikitsa” in the management of Sthoulya. Setting: Swastharakshana evam Yoga, OPD and IPD, SDMCAH, Hassan. Method: Udwarthana, Parisheka, Shamana Aushadhis, Ahara, and Vihara was followed within the treatment duration and effect of treatment was assessed before and after treatment, advised for follow up. Results: The treatment adopted is effective in the management of Sthoulya and to improve the quality of life.

scholarly journals Changes of Walking Activity During the First Cycle Phases of COVID-19 Pandemic: A Case Study of Seoul, Korea

2021 ◽  
pp. 193758672110265
Author(s):  
Youngjun Park ◽  
Haekwon Chung ◽  
Sohyun Park
Keyword(s):  
Public Health ◽  
Physical Inactivity ◽  
Voluntary Participation ◽  
Walking Activity ◽  
Significant Difference ◽  
Before And After ◽  
Acceleration And Deceleration ◽  
Preliminary Study ◽  
The Government

Aim: This study explores the changes in regular walking activities during the phases of the pandemic. Background: With the spread of COVID-19 transmission, people are refraining from going out, reducing their physical activity. In South Korea, COVID-19 broke out in the 4th week of 2020 and experienced the first cycle phases of the pandemic, such as outbreak, widespread, and decline. In response to the pandemic, the government encouraged voluntary participation in social distancing campaigns, and people reduced their outside activities. Methods: This article examines the decrease and increase of the Prevalence of Regular Walking (≥30 min of moderate walking a day, on ≥5 days a week) by the COVID-19 phases. This study is based on weekly walking data for 15 weeks in 2020, via the smartphone healthcare app, which is managed by 25 public health offices of the Seoul government. Results: According to the findings, the level of prevalence of regular walking (PRW) has a significant difference before and after the outbreak, and every interval of the four-stage COVID-19 phases, that is, pre-pandemic, initiation, acceleration, and deceleration. The level of PRW sharply decreased during initiation and acceleration intervals. In the deceleration interval of COVID-19, the PRW kept increasing, but it has not yet reached the same level as the previous year when the COVID-19 did not exist. Conclusions: As a preliminary study, this study explains empirically how COVID-19 changed PRW in Seoul. It would be helpful to enhance our understanding of the changes in physical inactivity in the pandemic period.

Temporal dynamics of encrusting communities during the Late Devonian: a case study from the Central Devonian Field, Russia

Paleobiology ◽  
2017 ◽  
Vol 43 (4) ◽  
pp. 550-568 ◽  
Author(s):  
Michał Zatoń ◽  
Tomasz Borszcz ◽  
Michał Rakociński
Keyword(s):  
Temporal Dynamics ◽  
Small Sample ◽  
Time Interval ◽  
Faunal Turnover ◽  
Central Devonian Field ◽  
Before And After ◽  
Substrate Size ◽  
Mass Extinction Event ◽  
Diversity Dynamics

AbstractIn this study we focused on the dynamics of encrusting assemblages preserved on brachiopod hosts collected from upper Frasnian and lower Famennian deposits of the Central Devonian Field, Russia. Because the encrusted brachiopods come from deposits bracketing the Frasnian/Famennian (F/F) boundary, the results also shed some light on ecological differences in encrusting communities before and after the Frasnian–Famennian (F-F) event. To explore the diversity dynamics of encrusting assemblages, we analyzed more than 1300 brachiopod valves (substrates) from two localities. Taxon accumulation plots and shareholder quorum subsampling (SQS) routines indicated that a reasonably small sample of brachiopod host valves (n=50) is sufficient to capture the majority of the encrusting genera recorded at a given site. The richness of encrusters per substrate declined simultaneously with the number of encrusting taxa in the lower Famennian, accompanied by a decrease in epibiont abundance, with a comparable decrease in mean encrustation intensity (percentage of bioclasts encrusted by one or more epibionts). Epibiont abundance and occupancy roughly mirror each other. Strikingly, few ecological characteristics are correlated with substrate size, possibly reflecting random settlement of larvae. Evenness, which is negatively correlated with substrate size, shows greater within-stage variability among samples than between Frasnian and Famennian intervals and may indicate the instability of early Famennian biocenoses following the faunal turnover. The occurrence distribution of encrusters points to nonrandom associations and exclusions among several encrusting taxa. However, abundance and occupancy of microconchids remained relatively stable throughout the sampled time interval. The notable decline in abundance (~60%) and relatively minor decline in diversity (~30%) suggest jointly that encrusting communities experienced ecological collapse rather than a major mass extinction event. The differences between the upper Frasnian and lower Famennian encrusting assemblages may thus record a turnover associated with the F-F event.

Sign in / Sign up

Export Citation Format

Share Document