An example of the use of jet grouting to permit tunneling in chemically weathered limestone

2020 ◽  
pp. 381-386
Author(s):  
Andrew D. Walker
Keyword(s):  
Jet Grouting

scholarly journals Numerical Analysis on Performance of the Middle-Pressure Jet Grouting Method for Ground Improvement

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 313
Author(s):  
Shinya Inazumi ◽  
Sudip Shakya ◽  
Takahiro Komaki ◽  
Yasuharu Nakanishi
Keyword(s):  
Life Cycle ◽  
Comparative Analysis ◽  
Ground Improvement ◽  
Cement Slurry ◽  
Mechanical Agitation ◽  
High Quality ◽  
Jet Grouting ◽  
Computer Aided ◽  
Improvement Method ◽  
Cae System

This study focused on the middle-pressure jet grouting method, which has a complicated development mechanism for the columnar soil-improved body, with the aim of establishing a computer-aided engineering (CAE) system that can simulate the performance on a computer. Furthermore, in order to confirm the effect of middle-pressure jet grouting with mechanical agitation and mixing, a comparative analysis was performed with different jet pressures, the development situation was visualized, and the performance of this method was evaluated. The results of MPS-CAE as one of the CAE systems showed that the cement slurry jet ratio in the planned improvement range, including the periphery of the mixing blade, by the middle-pressure jet grouting together with the mechanical agitation and mixing was increased and a high quality columnar soil-improved body was obtained. It is expected that the introduction of CAE will contribute to the visualization of the ground, and that CAE will be an effective tool for the visual management of construction for ground improvement and the maintenance of improved grounds during the life cycle of the ground-improvement method.

scholarly journals Errors in documenting the subsoil and their impact on the investment implementation: Case study

2021 ◽  
Vol 11 (1) ◽  
pp. 744-754
Author(s):  
Marzena Lendo-Siwicka ◽  
Grzegorz Wrzesiński ◽  
Katarzyna Pawluk
Keyword(s):  
Construction Projects ◽  
Organic Soils ◽  
Cohesive Soils ◽  
Engineering Model ◽  
Limit States ◽  
Uplift Pressure ◽  
Geological Engineering ◽  
Jet Grouting ◽  
Geotechnical Category

Abstract Improper recognition of the subsoil is the most common cause of problems in the implementation of construction projects and construction facilities failures. Most often, their direct cause is the mismatch of the scope of geotechnical diagnosis to the appropriate geotechnical category, or substantive errors, including incomplete or incorrect interpretation in the creation of a geological-engineering model and often overlooked hydrogeological conditions. In many cases, insufficient recognition and documentation of geotechnical and/or geological and engineering conditions leads to damage and construction failures, delays in consider construction, and the increase of the investment budget. That’s why, in order to avoid the above, particular attention should be paid to proper geotechnical and geological-engineering documentation at the design and construction stages. The selected example of the investment analyzed errors in the geological-engineering documentation, which mainly concerned the lack of recognition of locally occurring organic soils, the incorrectly determined location of the groundwater table and the degree of compaction of non-cohesive soils, and numerous errors of calculated values of soil uplift pressure. The detection of the errors presented in the paper made it possible to select the correct technology for the construction of the sanitary sewage system and to increase the thickness of the horizontal shutter made of jet grouting columns in the area of the excavation. In addition, the article discusses the principles of proper calculation of limit states and subsoil testing, which have a significant impact on the implementation of planned investments.

Upside Down: Historic Tram Goes Underground – an Infrastructure Challenge on the Way to a Modern City

2019 ◽  
Author(s):  
Oskar-H. Pekoll
Keyword(s):  
Tunnel Boring Machine ◽  
High Volume ◽  
City Center ◽  
Tunnel Boring ◽  
Traffic Routing ◽  
Jet Grouting ◽  
Track System ◽  
Pass Through ◽  
Tunnel System ◽  
Historic City

<p>To deal with the high volume of traffic in the historic city center of Karlsruhe (Germany), the track system of the historic surface tram is moved underground.</p><p>First, seven underground stations are built, which are then connected by using a tunnel boring machine for excavation of the tracks. While the traffic continues on the surface, the new underground stations are being built in sections using the dig-and-cast construction method. Due to the high ground water level bore piles and diaphragm walls of reinforced concrete / concrete cut-off wall are used as excavation pit shoring. A grouted sealing blanket made using jet grouting processes serves as horizontal blanket.</p><p>The cover is made while the traffic continues overhead, to this end traffic routing of road and tram traffic is altered in several stages of construction. The subsequent removal of the soil is realized via this newly created tunnel system – this way no truck traffic has to pass through the city center.</p><p>The construction is a challenge to permit a limitation of the deformations in relation to the settlement of the immediately adjacent historic buildings and also in the logistics of the construction while keeping the traffic above ground running.</p>

Investigating the Long-Term Settlement of a Tunnel Built over Improved Loessial Foundation Soil Using Jet Grouting Technique

2018 ◽  
Vol 32 (5) ◽  
pp. 04018066 ◽  
Author(s):  
Junling Qiu ◽  
Houquan Liu ◽  
Jinxing Lai ◽  
Hongpeng Lai ◽  
Jianxun Chen ◽  
...  
Keyword(s):  
Foundation Soil ◽  
Jet Grouting
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