Questions related to Excavation
In an archaeological project we found burial contexts, human bones only, in humid soil. We dug them in soil blocks. Where could I find information about method for both recovery of contexts within blocks of soil in the field and its cleaning, excavation, in the lab?. I wil, be glad if you can provide some references.
Initiated actions - Train traffic, Drilling, Tunneling, Excavations, Construction (underground), Extraction of minerals, etc.
Note: The answer may also consider upper or on the ground initiated actions as well.
Does anybody have knowledge of the recent statistics about the utilization of drill and blast method and mechanical excavation? I need statistics about the subject and I am sure I saw it somewhere but I was not able to find it again. I recognize that the question is broad but references from different methods of mining or tunnelling are welcomed.
Thanks in advance!
The soil from its natural composition shows irregularities, many times these irregularities are observed from one foundation to another.
It can also hide invisible dangers, such as caves under the base, underground rivers that can carry the ground and weaken its ability to absorb construction loads.
Although it is necessary to control by drilling a sample of the foundation soil with special drills before even the design of the building, however only in very large and important projects the soil control is performed.
Civil engineers to find solid ground remove loose ground until they find the most stable. (The lower layers of the soil are more stable because they have been compacted by the weight of the upper layers of the soil)
Excavations are a serious cost for construction. Large wall bases are another serious cost to build.
Why not remove large, wide bases that are expensive and require a formwork, replacing them with deep bases?
1) In-depth bases do not need large excavations.
2) In-depth bases do not need formwork
3) Deep foundations do not need much concrete.
4) The foundations with depth, show you the quality of the foundation because the required drilling that is needed for the foundation in depth is at the same time a sample check of the soil. 5) If you use the mechanism of the invention that I propose, you also achieve improvement of the soil before the construction, from the foundation surface, without excavations, because the anchoring mechanism through the help of a hydraulic tractor condenses it both horizontally and vertically, creating a strong foundation.
6) With the mechanism I propose creators and anchoring of construction and ground, which does not exist in the current design, which diverts seismic loads into the foundation ground, preventing them from being directed on the cross sections around the nodes.
The lateral seismic loads, cause overturning torques of the vertical elements which are transported to the cross sections around the nodes which react with reverse torques.
The result in a strong earthquake is that all sections are strained until they break. The pre-tensioning of the walls + anchoring to the ground prevents the overturning moment and the stresses in the cross-sections, because they divert the seismic loads in the ground.
There is also the shear force. The prestressing on the wall has beneficial effects on the shear forces.
I'm mining engineer from Morocco, I'm working now in open pit gold mine in West Africa.
I'm interesting to make Investigations or study to apply continuous mining equipment (like Bucket Wheel Excavators and others...) in a Shovel and Truck existing large open cut Phosphate mine. Exemple Phosphate OCP Operations, (Office Chérifien de Phosphate) based in Morocco : http://www.ocpgroup.ma/en
Can I participate in your project about selection optimum haulage methode ?
It will be my first contribution in continuous mining
Senior mining engineer
Have you ever encountered, during your studies, this kind of bronze crucible/melting-pot?
We found it during excavations in the northern part of Poland, on the site connected with Roman Iron Age period. We're supposing it's a crucible, because in its corner we found some kind of melted metal alloy (we're examinating it now), probably it could be lead, tin or silver. We're searching for analogies to this melting-pot in Poland but we haven't been able to find anything similar so far.
So if you have ever encountered a similar crucible, please let me know. We will be grateful for any help in this case!
In recent years, the Excavation Disturbed or Damaged zone (EDZ) has been a focus of continuous international research activities, covering the key processes, phenomena and features associated with the creation and evolution of the EDZ for a variety of host-rock formations, including crystalline rock, rock salt, soft clays and indurated clays. Soft clays and indurated clay formations were identified as a class of sedimentary rocks with a distinctive deformation behaviour, displaying transitional features between ductile yielding and brittle failure in response to the excavation process. In the context of radioactive waste disposal, special emphasis has been given to the favourable capacity of EDZ fractures in clay formations to self-sealing after closure of the backfilled repository structures. The Excavation Damaged Zone (EDZ) is a zone with significant irreversible processes and significant changes in flow and transport properties. These changes, for example, can include one or more orders of magnitude increase in flow permeability. (Tsang et al. 2005)
So my question is "What's the difference between Soft clays and indurated clay?"
There is a building with 5 basement levels. Top-down sequence is going to be applied. This deep excavation is modeled using Plaxis software.
The basement RC slab are used as horizontal strut to support the Diaphragm wall. Hence, the the lateral earth pressure cause the in-plane strut forces in the basement RC slabs.
The basement RC slabs need to be checked with load combination of gravity load and in-plane force.
The in-plane strut forces in these slabs are obtained from Plaxis.
Then these in-plane forces are applied manually in the slab model using CSI SAFE program.
My question is that:
Does CSI SAFE program take into account the in-plane force in the analysis?
Dear all.Please I need published articles/reports/theses on shear failure occurrences in underground excavations. Thank you.
I’ve worked and designed on the conventional tunnels such as NATM. But, in this time I’m beginning about excavation with TBM and I want know about the instrument in these tunnel. Is there any references about it? What are the difference between conventional method such as convergence meter, extensometer, and etc with the instrumentation which use in the mechanized tunnels?
Thanks in advance for sharing your experience!
I would like to get an update on numerical methods in rock engineering and rock mechanics, especially modeling stability of tunnels and underground excavations in fractured rocks. Evaluation of different methods, pros and cons.
Dear friends, Can somebody help to me calculate the production rate per hour and unit rate estimate of excavation in rock (Dolomite) which is to be carried out without explosives. It would be undertaken with Excavator 50T + Hydraulic Jack Hammer 3.2T and Hydraulic and Rotary Drum Cutter for excavator 50T . Thank you and BR, Khan
I am modelling a circular tunnel. I want to simulate the tunnel excavation by the converge confinement method or β-method. is there any assumed values for M stage that using in plaxis 2d?
Some time ago I worked on a secondary funerary context from the Amazonian region in which the human remains were deposited under a funerary pot instead of inside it (very frequent practice). The ceramic pot was complete, the context was not disturbed prior to the archaeological excavation and deposition was intentional. I'd appreciate if you could suggest similar cases in the literature. Thank you for any help.
At two sites in Roman Britain, I have noticed bowls and a dish in 'samian ware' [terra sigillata] pierced, post cocturam, with occasional holes: the holes are too large to be the standard, small rivet-holes which were commonly used to repair pots with metal-work here.
The holes in question are of diameter c 8 mm and were pierced through the lower wall or base, above the footring of the vessel. Just 'flying kites' here, but... Were these vessels pierced for hanging up by a cord, or some ritual or culinary purpose? One hole shows smoothing or rubbing of the hole: it seems more likely that the hole was smoothed to stop the cord from snagging on a rough edge, than that the cord's rubbing caused the hole to be smoothed. Or was it smoothed for pouring?
So far, the only two sites at which I have noted these large holes are amphitheatres. This may be fortuitous, as such holes may have been described in excavation reports as repair-work. However, amphitheatres had external stalls and booths, portable ovens, etc. So far, the only Roman depictions found of pots hanging up are a few sculptures which show wine-sellers with flagons hanging up, but hung by the handle. I have found references in classical literature which may be relevant, but more would be appreciated.
Without more evidence, it will be impossible to give a firm answer to the question of their function, but any further ideas would be welcome!
While doing an open excavation modelling for 20m deep excavation it was noted that the effect dialtency of sand is negligible in predicting displacements. Is this behavior is possible
Iron Age, Scotland, Subterranean, Cave, ritual, not including Souterrrains. Thank you. A site name would help, an excavator name would help more, links to papers or details of publication would be best.
I am planning an excavation project and I am considering putting all field data recording on tablets. I am looking for articles discussing the use of tablets in the field to keep notes, fill in forms, take photographs and make maps. I would also appreciate advice on what tablets to use and the best software for different tasks.
The comparisons submitted, are mostly old and did not consider all involving parameters. I am looking for new approaches that involve more parameters into the comparison.
I need a sizable sample of reports from excavations in France and, possibly, Belgium. Does anyone know of any British institutions that might have a large collection of them?
I want some references about digital excavation movement detection,is there any one can help me (specially about relative displacement) ?
I'm undertaking a review of dogs & wolves in Prehistoric Britain for my undergraduate dissertation, I'm finding it difficult to find papers where the more recent excavations of these animals have been found. I know of a few Neolithic examples and one Bronze Age one, but there must be more than that.
Any help will be greatly appreciated.
I need to perform laboratory test for shallow foundation which located near excavated soil that retained by spaced pile row. The footing soil retaining structure has to be studied to understand bearing capacity reduction of such condition.
I want to numerically evaluate the effect of deep excavation on deformation and displacement of adjacent tunnels.