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List of products by author: D. Peila
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Cross passages between twin tunnels. Preliminary design schemes
Abstract: When a project includes two parallel tunnels, cross passages linking both tunnels are normally constructed for safety reasons during tunnel exercise. Design and construction of the cross passages is a challenging issue in tunnelling design. Excavating cross passages through rock, soft ground, and mixed face conditions presents very different challenges as well as handling groundwater creates...
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Development of a soil abrasion test and analysis of impact of soil conditioning on tool wear for soft ground...
Abstract: In the recent years, Earth Pressure Balance (EPB) shields have been successfully used in many tunnels in urban areas. One of the critical issues for successful EPB tunneling is the use of proper soil conditioning to reduce wear and torque. Among the parameters that can affect tool wear, soil conditioning is the most important one that can be controlled by the operators. Soil conditioning has...
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Experimental investigation on effect of ambient pressure of conditioned soil on tool wear in earth pressure balance...
Abstract: The use of mechanized excavation especially shielded tunnel boring machines (TBMs), has grown rapidly in various soft ground tunneling projects. One of the advantages of mechanized tunneling compared to conventional method is the ability of the machines in coping with various geological conditions. In the recent years, Earth Pressure Balance (EPB) shields have been successfully used in many...
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Mechanical improving of granular soils by permeation grouting: results of laboratory tests
Abstract: The injection of natural soil using proper mixes is one of the most effective ground improvement technique. Consolidation and waterproofing are the two main purposes of these treatments, both in granular soils and in rock masses. The application field of these materials, depends on many external parameters, related to the characteristics of the soil, the injection mixes and injection techniques...
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New study to assess the geomechanical behavior of the expansion of the Rodoretto talc mine
Abstract: The paper describes the study carried out in the Rodoretto mine to verify the behavior of the mine infrastructure after a new exploitation extension. Due to a complex geometry and variability in the geology, the new stress distribution around mine infrastructures has been assessed by using numerical methods. Using an ideal elasto-plastic model also the yielding zone distribution has been...
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Soil conditioning of volcanic soil using low environmental impact agents
Abstract: EPB technology is an effective tunnelling method in urban areas when surface settlements must be avoided by controlling face stability and underground water inflow. Soil conditioning plays a major role on this aspect, although the use of additives should be limited encouraging the use of low environmental impact products. This paper analyses the conditioning process of the EPB used for the...
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The two -component grouta double approach for the Young’s modulus assessment
Abstract: The two-component grout is nowadays the most widely used technology in mechanized shielded tunneling for the backfilling process. Despite its wide use, very little information is currently available on the study of its mechanical properties and their evolution as a function of the curing time. Furthermore, in several construction sites the need has recently emerged to verify the compliance of...
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Use of bentonite and biodegradable slurry for cobble -rich soil conditioning
Abstract: Cobble-rich soils are always a difficult challenge for EPB-TBM tunnelling and the traditional soil conditioning through water and foam may not lead to suitable results. The addition of bentonite slurries is helpful to solve this problem but may be impaired by environmental regulations, in such cases the use of a biodegradable polymeric slurry may be a viable solution. This paper makes a...
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Wear in Granular Soils: results of a new procedure by using a soil abrasion testing apparatus with a wear disk
Abstract: The wear phenomenon in mechanized excavation machines is very complex. Many parameters play key roles in wear and in EPB machines wear in all areas where there is a continuous friction between ground and steel. Because of the complex nature of phenomenon, to design a laboratory test procedure and a laboratory test device that can provide correct results in terms of predicting of wear is not...
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