The state of practice of in situ tests for design, quality control and quality assurance of ground improvement works

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Serge Varaksin ◽  
Babak Hamidi
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Ground Improvement ◽  
The State ◽  
In Situ Tests ◽  
Design Quality ◽  
State Of Practice

scholarly journals Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario

2016 ◽  
Vol 61 (1) ◽  
pp. 199-216 ◽  
Author(s):  
Marilena Cardu ◽  
Sergio Dipietromaria ◽  
Pierpaolo Oreste
Keyword(s):  
Numerical Models ◽  
The State ◽  
In Situ Tests ◽  
Future Scenario ◽  
Limestone Quarry ◽  
Geomechanical Properties ◽  
State Of Stress ◽  
Upper Level ◽  
Pillar Structure

Abstract The aim of this study was to evaluate the state of stress of a „voids-pillar“ structure excavated by means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy). Both the current structure of the quarry (i.e. the rooms exploited till now) and a possible future scenario were analysed using the (FDM) FLAC 2D code. The quarry has been in operation since 1927; at present, exploitation is carried out underground via the sub-level stoping method. Exploitation involves two levels, with 5 rooms on the upper level and 9 rooms on the lower level. After analysing data obtained from laboratory and in situ tests carried out on rock samples and natural discontinuities, the geomechanical properties of the medium, knowledge of which is essential in order to establish the parameters that must be included in the numerical model, were evaluated. The implementation of three numerical models made it possible to study both the present conditions of quarry exploitation and the evolution of the exploited rooms, as well as a possible expansion involving a third level of rooms. Using the results obtained regarding the stress-strain present in the pillars, a potential change in room geometry was proposed aimed at reducing the stress state inside the pillars, decreasing plasticity and increasing overall quarry safety.

scholarly journals Quality Assurance/Quality Control of Fluorescence in Situ Hybridization Tests in Hematologic Malignancies

OBM Genetics ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 1-1 ◽  
Author(s):  
Zhenya Tang ◽  
◽  
Jun Gu ◽  
Guilin Tang ◽  
L. Jeffrey Medeiros ◽  
...  
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Hematologic Malignancies

Liquefaction performance of soils at the site of a partially completed ground improvement project during the 1999 Chi-Chi earthquake in Taiwan

2001 ◽  
Vol 38 (6) ◽  
pp. 1241-1253 ◽  
Author(s):  
Der-Her Lee ◽  
C Hsein Juang ◽  
Chi-Sheng Ku
Keyword(s):  
Ground Improvement ◽  
Construction Site ◽  
Cone Penetration ◽  
In Situ Tests ◽  
Improvement Project ◽  
Cone Penetration Tests ◽  
Hydraulic Filling ◽  
Before And After ◽  
Penetration Tests

This paper examines the liquefaction performance of soils at the site of a partially completed ground improvement project at the Chang-Hwa Coastal Industrial Park during the 1999 Chi-Chi earthquake in Taiwan. The site is on land reclaimed by hydraulic filling. To meet the need of a planned construction, site characterization was carried out with standard penetration tests (SPTs) and cone penetration tests (CPTs) at 13 locations. Dynamic compaction was later performed to mitigate the potential liquefaction hazards at this site. Before completion of the ground improvement work, the site experienced a major earthquake, the Chi-Chi earthquake (magnitude Mw = 7.6). Evidence of liquefaction was observed in this earthquake in the unimproved area but not in the improved area. After the earthquake, additional site exploration was carried out using SPTs and CPTs. The data from these in situ tests carried out before and after the earthquake and in areas with and without ground improvement are analyzed and the results are reported.Key words: ground improvement, in situ tests, liquefaction, earthquake.

scholarly journals Exploring product design quality control and assurance under both traditional and crowdsourcing-based design environments

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881439 ◽  
Author(s):  
Xiaojing Niu ◽  
Shengfeng Qin ◽  
Haizhu Zhang ◽  
Meili Wang ◽  
Rose Wong
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Product Design ◽  
Design Activity ◽  
Key Factors ◽  
Design Environment ◽  
Design Quality ◽  
Factors Affecting ◽  
Design Environments ◽  
Traditional Design

Small and medium-sized enterprises face the challenges that they do not have enough employees and related resources to produce high-quality products with limited budget and time. The emergence of crowdsourcing provides an opportunity for them to improve their products by leveraging the wisdom of a large community of crowds, including their potential customers. With this new opportunity, product design could be conducted partially in a traditional design environment (in-house design) and partially in a crowdsourcing environment. This article focuses on product design stages to investigate what key factors affect product design quality and how it can be controlled and assured. First, we define the concept of product design quality and then identify its attributes and sub-attributes. Second, we separately survey key factors affecting product design quality in traditional and crowdsourcing-based design environments, quality control approaches/theories and quality assurance policies in traditional design environment. Third, a comparison of product design quality issues between the traditional and crowdsourcing-based design environments is progressed focusing on various aspects influencing product design activity quality. Finally, we discuss product design quality control approaches and quality assurance policies, quality control challenges and corresponding solutions in crowdsourcing-based design environment.

Parameter Estimation for Evaluation of in Situ Density and Moisture Content by using Elastic and Electromagnetic Wave Propagation

2008 ◽  
Vol 2045 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Bashar Alramahi ◽  
Dante Fratta ◽  
Khalid A. Alshibli
Keyword(s):  
Quality Control ◽  
Wave Propagation ◽  
Quality Assurance ◽  
Electromagnetic Wave ◽  
Moisture Content ◽  
Water Content ◽  
Electromagnetic Wave Propagation ◽  
Soil Density

Soil density and moisture content are two essential properties in the quality control and quality assurance of projects that involve soil compaction. However, current field practices either are destructive and time-consuming (i.e., sand cone or water balloon for soil density and oven drying for moisture content) or include hazardous substances that require special handling and operating procedures (i.e., nuclear density gauge). Therefore, new robust, reliable, and nonnuclear techniques for the determination of in situ density and moisture content would assist in quality control and quality assurance processes and would allow more measurements to be performed in a shorter time. A methodology for the in situ determination of density and moisture content by using the propagation of elastic and electromagnetic waves through soils was evaluated. It is based on a semiempirical model that relates elastic wave velocity through soils to the water content, porosity, and degree of saturation. An experimental program was used to verify the model and examine its range of applicability. It was also used to examine the accuracy and limitations of the suggested methodology. An analysis was made of the experimental assessment, along with a detailed numerical study of the inversion procedure used to calculate the density and moisture content. Although the parametric and experimental study shows that the methodology can provide an estimate of density and water content rapidly and non-destructively, there are inherent accuracy and precision limitations that need to be solved. These results also show that combined elastic and electromagnetic wave propagation measurements can help in the development of a methodology that may assist in solving inconsistencies in stiffness measurements.

scholarly journals LEGAL AID: SHAPING THE SHORELINE WAVE BY WAVE

Obiter ◽  
2015 ◽  
Vol 36 (2) ◽  
Author(s):  
Hennie van As
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Quality Improvement ◽  
External Quality Assessment ◽  
Self Regulation ◽  
The State ◽  
Legal Aid ◽  
External Quality ◽  
The Third ◽  
Financial Conditions

A study of the global development of legal aid reveals that it developed in five waves and that legal aid schemes are combinations of three variables, namely scope (what is covered), eligibility (matters that qualify for legal aid and financial conditions) and delivery (who provide the services and at what cost). The article argues that there is a sixth wave, namely quality assurance and that the third variable has been extended to include reference to quality. Quality assurance normally has its origin in self-regulation or in requirements set by implementing bodies of the state. It is difficult to determine what constitutes “quality” and it is even more difficult to reach consensus on its meaning. An investigation into quality assurance in two jurisdictions shows that there is not a “one size fits all” template available. The nature and extent of the services rendered and the manner in which quality assurance is applied, depends on the delivery variable (whether it is salaried, judicare or mixed). The philosophy behind it is also important. If it is mere “window dressing” or designed to give effect to a Constitutional or some other legislative requirement, the system will not achieve credibility in the eyes of the beneficiaries thereof. Quality control that is directed towards providing customer satisfaction, and where the user of the service is seen as the ultimate recipient and arbiter of a benefit that is paid for by the state, has a much better prospect of being judged effective and credible. External quality assessment goes a long way towards promoting quality improvement and credibility.

Research of Dynamic Compaction: A Review of Recent Academic Literature

2014 ◽  
Vol 1079-1080 ◽  
pp. 406-409 ◽  
Author(s):  
Bin Bin Xu ◽  
Rui Qi Zhang ◽  
Guo Liang Ye
Keyword(s):  
Literature Review ◽  
Ground Improvement ◽  
Dynamic Compaction ◽  
In Situ Tests ◽  
Academic Literature ◽  
Reinforcement Mechanism ◽  
Effective Reinforcement ◽  
Compaction Method

Dynamic compaction is one of the densification techniques of ground improvement and extensive theoretical, experimental and in-situ tests have been used to clarify its mechanism. In this paper, a literature review about the dynamic compaction is carried out and the emphasis is put on the reinforcement mechanism, effective reinforcement depth and influence range of vibration to give a reference for the ongoing researches of dynamic compaction method.

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