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Feb 10, 2020 Terzaghi at 1950 for the first time provided the Tunnelman’s Ground Classification system which became famous as a common and functional tunneling classification of soft ground, and later Heuer in 1974 refined it. Tunnelman’s Ground Classification System was designed to explain different ground performances and their effect on larger, conventionally constructed soft ground tunnels. This system is also a powerful tool to evaluate the soft ground conditions … |
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Feb 10, 2020 This page presents the assignment of different soil types to three compactibility classes based on German standards. As per ASTM, non-cohesive to cohesive soils as well as coarse-grained and mixed soils (sand and gravel) have good compactibility characteristics. (Table: Compactibility class V1 to V3 as per ZTVA-StB 97) In this context, the tabular information on the classification of soils for civil engineering purposes in this (→ Table: Soil classification … |
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Feb 10, 2020 Based on the previous page, a finer differentiation and assignment of compactibility classes and soil types is done based on German standard which is used for the structural calculation of pipelines [ATVA127]. (Table: Soil Classification (DWA-A 139)) Further soil characteristics according to EAU 1996 can be found in the following (→ Table: Soil characteristics draft (e 9) of EAU 1996) |
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Feb 10, 2020 (Table: Soil characteristics for cohesive soil, calculated values according to DIN 1055) |
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Feb 10, 2020 (Image: Attention!) The greater the proportion of clay minerals capable of swelling in the particle fraction, the greater is the water-binding capacity and thus also the plasticity of a soil [Lang90]. Clay minerals either developß by chemical alteration of minerals or by new formation in the sedimentation stage and swell depending on the water content. (Image: Influencing variables of the soil - Particle size of clay minerals) (Image: Structure of a … |
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Feb 10, 2020 The determination of the unaxial compressive strength qu of soils, also known as cylinder compressive strength, is carried out according to DIN 18136 on cylindrical or prismatic test bodies at constant compression velocity and with unhindered side expansion [DIN18136:2003]. The unaxial compressive strength is also used in the description of the condition of cohesive soils [Kezdi68] [Lambe69]. (Table: N values for clays in relation to uniaxial compressive … |
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Feb 10, 2020 Soil is a structure made up of a framework of solid particles with water and air-filled pores and is therefore sensitive to shear loads that are caused by shear stresses. The shear movement is a forced relative movement between the single soil particles or soil masses. Here, the adhesion due to previous impacts and consistency that is caused by auxiliary forces (cohesion and adhesive strength) and the friction forces between the single soil particles … |
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Feb 10, 2020 (Image: Soil element under shear loading [Schmi96]) The shear strength τ consits of the components of cohesion c and the friction μ. (Image: Attention!) The shear strength τ and the shear parameters φ and c are of great importance in trenchless installation in connection with the structural analysis of shafts, the estamination of the jacking forces to be expected, and the stability of boreholes, excavated cavities, and the working face. |
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Jan 11, 2023 (Video: Bert Bosseler Open-cut method Soil and Components Flowable Back-Fill Material) |
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(Video: Robert Stein - Introduction to Trench Protection 2023 - Neu) |
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Dec 06, 2021 News Director, Communications & External Affairs Laura Martin According to new research conducted by global research agency Opinium on behalf of American Water, Americans underestimate the amount of water they use daily by 90%.
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Dec 07, 2021 News Communications & Marketing Gretchen Toner Essential Utilities Inc. announced that its Pennsylvania wastewater subsidiary has signed an asset purchase agreement with the City of Beaver Falls in Beaver County to acquire the municipality’s wastewater assets for approximately $41.25 million.
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Dec 08, 2021 News EverGen Investor Contact Kelly Castledine EverGen Infrastructure Corp. , Canada’s Renewable Natural Gas Infrastructure Platform, announces that the immediate enhancement and optimization projects at Fraser Valley Biogas Ltd. (“Fraser Valley Biogas”) in Abbotsford, BC., have resulted in record production in the month of September, supporting the growing demand for RNG in the province.
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Dec 10, 2021 News Colleen Moffitt Cardiff and Birmingham terminals consistently achieve 90%+ automation and improved turn times with integrated TOS deployment.
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Dec 14, 2021 News M.A. Katrin Droste Necessary network maintenance leads to UNITRACC interruptions on 15 December and 16 December 2021 each, from 12.30 to 1.30 p.m. EST.
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Dec 27, 2021 News Luis D. Sosa ENGEO Incorporated acquires TerraCosta Consulting Group
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Dec 28, 2021 News Sarah Brown Evoqua Water Technologies an industry leader in mission-critical water treatment solutions announced that it received the Frost & Sullivan's 2021 Global Company of the Year Award for sustainability in the water technology market.
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Aug 05, 2022 Article Dipl.-Ing. Christoph Bennerscheidt Development for the American Biotech company
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Jun 24, 2019 News The Robbins Company Double Shield Machine flies through Himalayan Hard Rock
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Jun 25, 2019 News Achim Kühn In The Hague, a refurbished tunnel boring machine (Mixshield, Ø 11,340 mm) has successfully excavated the twin tubes of the Victory Boogie Woogie Tunnel. After only 12 months, in January 2019 the final breakthrough took place near the city center of the Dutch coastal city. With a length of around 1,600 meters per tube, the tunnel section built using mechanized tunnelling technology is the centerpiece of Rotterdamsebaan, the largest infrastructure project in The Hague.
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This report was prepared by the Trenchless Technology Center (TTC) for the U.S. Army Corps of Engineers, Engineering Research and Development Center (ERDC). Neither TTC, the U.S. Army Corps of Engineers, nor any person acting on their behalf, makes a warranty, express or implied, with respect to the use of any information, apparatus, method, or process disclosed in this report or that such use may not infringe on privately owned rights; or assumes … |
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Although impact moling is an established and widely used trenchless method for installation of smaller pipes over shorter lengths, it has not been not covered adequately with guidelines and standards. The need for guidelines in this area was demonstrated in a study Identification of Needs for User Guidance in Trenchless Technology Applications, which was prepared by the Waterways Experiment Station (WES) (now Engineering Research and Development … |
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These guidelines have been prepared to assist owners, designers and contractors involved in new pipe installation projects to evaluate capabilities of impact moling for such projects and to design and carry out impact moling jobs effectively and safely, in consistence with project requirements and site conditions. The objective of the guidelines is to give a clear understanding of the method, outline important design and construction considerations, … |
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