Design and Siting for Large Diameter Well Type Repositories

2003 ◽  
Author(s):  
Sergey Dmitriev ◽  
Lev Prozorov ◽  
Aleksey Tkachenko ◽  
Andrey Guskov ◽  
Svetlana Korneva
Keyword(s):  
Large Diameter ◽  
Activity Level ◽  
Intermediate Level ◽  
Construction Technology ◽  
Actual Problem ◽  
Near Surface ◽  
Drilling Rig ◽  
Safe Level ◽  
Central Russia ◽  
Geological Conditions

RADON enterprises are historically responsible in Russia for institutional waste of low and intermediate activity level. MosNPO RADON is a leading organization for 16 enterprises of RADON system, established in the early 60-s, only 14 from which are now in operation and have about 10% of their repositories available for upcoming waste. Construction of new repositories and selection of new perspective sites is very actual problem for RAW management in Russia now. Traditionally near surface repositories are considered to be acceptable for storage or even disposal of low and intermediate level waste (LILW), which decay to safe level in some hundreds of years. Forty years experience in LILW isolation using near surface repositories at Russian RADON facilities has shown that a lot of operational and natural factors impact on the engineered barriers and may cause failure of the isolation (freezing-thawing cycles, construction works). In addition construction of new old-type repositories requires more area. Since 1997 development and testing of Large Diameter Wells (LDW) as a new type of repositories for low and intermediate level waste is carried out at Zagorsk site. MosNPO RADON specialists developed the LDW construction technology with the aim to use such wells for LILW isolation in moraine clays. The diameter of LDW-type repository may range from 1 to 5 m depending on drilling rig capabilities and performance parameters of host rock. The depth of well (repository) depends on geological parameters and hydro-geological conditions at the site. These features affect on the siting process by additional geological and hydro-geological requirements. In result of preliminary studying of Central Russia two regions were found to be perspective for construction of LDW-type repositories.

Analysis of Efficiency of Drilling of Large-Diameter Wells With a Profiled Wing Bit / Badania Efektywności Wiercenia Studni Wielkośrednicowych Świdrem Skrawającym z Profilowanymi Skrzydłami

2012 ◽  
Vol 57 (2) ◽  
pp. 363-373
Author(s):  
Jan Macuda
Keyword(s):  
Average Rate ◽  
Large Diameter ◽  
Open Pit ◽  
Mechanical Parameters ◽  
Drilling Rate ◽  
Geological Conditions ◽  
Rock Drillability ◽  
Drilling Technology ◽  
Weight On Bit ◽  
Rotary Speed

Abstract In Poland all lignite mines are dewatered with the use of large-diameter wells. Drilling of such wells is inefficient owing to the presence of loose Quaternary and Tertiary material and considerable dewatering of rock mass within the open pit area. Difficult geological conditions significantly elongate the time in which large-diameter dewatering wells are drilled, and various drilling complications and break-downs related to the caving may occur. Obtaining higher drilling rates in large-diameter wells can be achieved only when new cutter bits designs are worked out and rock drillability tests performed for optimum mechanical parameters of drilling technology. Those tests were performed for a bit ø 1.16 m in separated macroscopically homogeneous layers of similar drillability. Depending on the designed thickness of the drilled layer, there were determined measurement sections from 0.2 to 1.0 m long, and each of the sections was drilled at constant rotary speed and weight on bit values. Prior to drillability tests, accounting for the technical characteristic of the rig and strength of the string and the cutter bit, there were established limitations for mechanical parameters of drilling technology: P ∈ (Pmin; Pmax) n ∈ (nmin; nmax) where: Pmin; Pmax - lowest and highest values of weight on bit, nmin; nmax - lowest and highest values of rotary speed of bit, For finding the dependence of the rate of penetration on weight on bit and rotary speed of bit various regression models have been analyzed. The most satisfactory results were obtained for the exponential model illustrating the influence of weight on bit and rotary speed of bit on drilling rate. The regression coefficients and statistical parameters prove the good fit of the model to measurement data, presented in tables 4-6. The average drilling rate for a cutter bit with profiled wings has been described with the form: Vśr= Z ·Pa· nb where: Vśr- average drilling rate, Z - drillability coefficient, P - weight on bit, n - rotary speed of bit, a - coefficient of influence of weight on bit on drilling rate, b - coefficient of influence of rotary speed of bit on drilling rate. Industrial tests were performed for assessing the efficiency of drilling of large-diameter wells with a cutter bit having profiled wings ø 1.16 m according to elaborated model of average rate of drilling. The obtained values of average rate of drilling during industrial tests ranged from 8.33×10-4 to 1.94×10-3 m/s and were higher than the ones obtained so far, i.e. from 181.21 to 262.11%.

scholarly journals The design of bottomhole assembly with two rock cutting tools for directional drilling

2018 ◽  
pp. 14-20
Author(s):  
I. V. Voievidko ◽  
V. V. Tokaruk ◽  
M. A. Bodzian
Keyword(s):  
Theoretical Analysis ◽  
Inclination Angle ◽  
Large Diameter ◽  
Cutting Tools ◽  
Intensity Variation ◽  
Rock Cutting ◽  
Hole Drilling ◽  
Directional Drilling ◽  
Geological Conditions ◽  
Technical Factors

On the basis of the theoretical analysis and practical studies of hole drilling of large diameter, a method for designing the BHA with two rock cutting tools is proposed, taking into account the geological and technical factors that have an impact on the formation of the trajectory. The calculation of BHA with two rock cutting tools and a different number of supporting and centralizing components for different geological conditions of drilling is carried out and the analysis of their work in the process of drilling is conducted. The graphic dependences of the deviation intensity variation and the inclination angle with the sinking of borehole of the large diameter for the BHA that can be used for the drilling of vertical and directional wells.

INFLUENCE OF NATURAL CONDITIONS OF THE TERRITORY ON FLOODING OF ARTIFICIAL COVERINGS OF THE AIRPORT OF CHITA

2021 ◽  
Vol 27 (1) ◽  
pp. 24-33
Author(s):  
D. Shesternev ◽  
◽  
A. Verkhoturov ◽  
Keyword(s):  
Underground Water ◽  
The South ◽  
Natural Conditions ◽  
Engineering Structures ◽  
Protective Measures ◽  
Near Surface ◽  
Geological Conditions ◽  
National Economic ◽  
Engineering Protection ◽  
Interpretation Of Satellite Images

he study of flooding of engineering structures as a dangerous engineering and geological process and the prevention of emergencies and environmentally adverse consequences is an important task of national economic importance. The purpose of this work was to study the natural conditions of the area of the Kadala airport in Chita to identify the main causes of flooding of the artificial runway (IVPP). The object of research was the near-surface part of the geological environment, the subject-the factors of formation of hydrogeological, engineering-geological and geocryological conditions. In the course of the research, the following tasks were solved: 1) identification of factors that affect flooding; 2) assessment and proposal of acceptable protective measures. The research methodology included: collection and analysis of materials from previous engineering and geological studies; interpretation of satellite images; field survey of the artificial runway and adjacent territory; analysis of hydrometeorological conditions. As a result of the research, the factors that lead to flooding of the south-eastern section of the airport, and in winter to the formation of ice and deformations on this section of the airport’s artificial surfaces are determined. The identified factors are divided into regional and local. The hydrogeological and engineering-geological conditions of the territory and their dynamics over time are considered. It is determined that the main factors of flooding are the creation of barrages in the path of the movement of underground water and the intensive freezing of the soil on the section of the artificial runway. Recommendations for the stabilization of the ground base on this site and measures for the engineering protection of the airport territory are given. The implementation of the recommendations will ensure the accident-free operation of the artificial runway and improve the environmental condition of the settlement adjacent to the airport from the south-east

An Integrated Safety Assessment System for Near-Surface Disposal of Low- and Intermediate-Level Radioactive Waste in Korea

2003 ◽  
Author(s):  
JooWan Park ◽  
Chang-Lak Kim ◽  
Jin Beak Park ◽  
Eun Yong Lee ◽  
Youn Myoung Lee ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Safety Assessment ◽  
Assessment System ◽  
Intermediate Level ◽  
Radioactive Waste Disposal ◽  
System Level ◽  
Assessment Methodology ◽  
Regulatory Requirements ◽  
Near Surface ◽  
Intermediate Level Radioactive Waste

An integrated safety assessment system to be used for evaluation of near-surface disposal concept has been developed within the framework of safety assessment methodology taken for low- and intermediate-level radioactive waste disposal in Korea. It is to provide an evaluation of the safety of the disposal system in a clear, comprehensive and well-documented manner, and to integrate the results into a defensible package showing reasonable assurance of compliance with regulatory requirements for licensing application. This system is made up of two key components, a system-level safety assessment code and an input database/quality assurance module for safety assessment, which both are interfaced with each other.

scholarly journals Construction Technology of Composite Cofferdam for Main Pier Bearing Platform of Dongjiang Lichuan Bridge

2020 ◽  
Vol 165 ◽  
pp. 04047
Author(s):  
Jianping Wang
Keyword(s):  
Steel Sheet ◽  
Economic Benefits ◽  
Construction Technology ◽  
High Quality ◽  
Rock Stratum ◽  
Advantages And Disadvantages ◽  
Construction Methods ◽  
Bored Pile ◽  
Geological Conditions ◽  
Pile Cap

Dongjiang Lichuan Bridge in Dongguan City is a curved tower curved beam cable-stayed bridge with a main span of 138m and no back cable. The main pier cap is located on the bank slope of Dongguan Waterway on one side of Nandi Road. The cushion cap is dumbbell type, and the left and right cushion caps are connected by tie beams. In most areas, the top of rock stratum is above the bottom of bearing platform. The rock stratum within the buried depth of bearing platform is moderately to strongly weathered argillaceous siltstone. The geological conditions are complex and the construction is difficult. In line with the principles of speeding up the construction process and improving economic benefits, comprehensive analysis and weighing advantages and disadvantages, the main pier cap adopts a composite cofferdam of filling soil to build an island and combining bored pile rows and steel sheet piles. The construction task of bearing platform of main pier has been completed with high quality. Compared with other cushion cap construction methods, this construction method has the advantages of fast construction, high quality, simple safety, energy saving and environmental protection. This paper briefly introduces the design scheme of composite cofferdam, expounds in detail the operation steps of steel sheet pile construction and the problems needing attention in construction, and provides good reference experience for similar pile cap construction.

Engineering Feasibility Study on the Beijing East 2nd Ring Underground Road

2013 ◽  
Vol 353-356 ◽  
pp. 1495-1501
Author(s):  
Jin Gang Wu ◽  
Ren Dong Chen ◽  
Qiang Bi ◽  
Hua Guo
Keyword(s):  
Large Diameter ◽  
Technical Difficulty ◽  
City Center ◽  
Technical Standards ◽  
Construction Methods ◽  
Geological Conditions ◽  
Solid Foundation ◽  
Complex Construction ◽  
Underground Transportation ◽  
Construction Organization

The Beijing East 2nd Ring underground road is one of the three horizontal and four vertical underground expressways, and it is an important part of Beijing's expressway system. Technical standards, engineering line location, geological conditions, construction methods, construction organization, controlling conditions of the project are illustrated in the paper. Research and demonstration of the feasibility of the projects is carried out. The conclusions are as follows: (1) The overall line location conform to the city's underground transportation system planning. (2) The overall project layout is correct. Underground space is used reasonably. The urban expressways system can be improved. The technical standards of the expressway project can be satisfied. (3) The project connects Puhuangyu Expressway and Beijing-Chengde Highway. Cross-border traffic is solved. That plays an important role to ease the traffic pressure of city center road network. (4) Large diameter shield construction program is feasible. (5) The large cross-section of proposed tunnel, complex construction environment, high technical difficulty, could be included in the forefront of the construction of city tunnel at home and abroad. Scientific and technological research and research projects are proposed to carry out, laying a solid foundation for the smooth implementation.

Construction Method and Numerical Analysis on the Bearing Capacity of the Large Diameter and Abyssal Pile Located in Complex Karst Area

2013 ◽  
Vol 639-640 ◽  
pp. 688-693
Author(s):  
Jin Yi ◽  
Guo Jing He ◽  
Si Si Liu ◽  
Zhi Yong Li ◽  
Zu En Zheng
Keyword(s):  
Bearing Capacity ◽  
Load Transfer ◽  
Large Diameter ◽  
Construction Method ◽  
Karst Area ◽  
Karst Region ◽  
Pile Capacity ◽  
Construction Methods ◽  
Geological Conditions ◽  
Transfer Method

This paper introduced construction method for deep pile of Zishui bridge through karst region and the checking results of the pile bearing capacity. Firstly, main structure of Zishui bridge was simply introduced. Secondly, according to the special geological conditions, construction methods for bored piles in water and drilling platform were described. The discussion focused on the problem of boring and grouting in karst foundation and their solutions. Finally, to ensure that the pile capacity can meet the design requirements, load transfer method was used on the part of pile foundation to calculate the bearing capacity. Results showed that pile bearing capacity meet the requirements, and the feasibility and correctness of construction method of Zishui bridge was also verified,which provides references for the design and construction of the same civil engineering.

Deep Well of Coal Roadway Bolt-Cable Mechanism Analysis and its Engineering Application

2012 ◽  
Vol 226-228 ◽  
pp. 1094-1097 ◽  
Author(s):  
Bai Xiao Tang ◽  
Yong Wei Wang
Keyword(s):  
High Stress ◽  
Soft Rock ◽  
Engineering Practice ◽  
Construction Technology ◽  
Mechanism Analysis ◽  
Small Aperture ◽  
Deep Well ◽  
Coal Roadway ◽  
Geological Conditions ◽  
Support Cost

Cable Anchor Supporting mechanism theory analysis, combined with high geostress, composite roof and complex geological conditions, the deep well under conditions of coal roadway by small aperture, anchor on the form of the structure and high prestressed construction technology, engineering practice shows that the technology is simple and applicability,is deep well solve the high stress soft rock tunnel, large sections into bifurcation point supports of the effective way of the problem. Not only reduces the support cost, reduce the workload of the Lane repair, and also greatly reduce the labor intensity of construction personnel, improve the reliability of the engineering safety. Accumulated experience, has broad application prospects for the deep well under the conditions of the other coal mine soft rock roadway

Sign in / Sign up

Export Citation Format

Share Document