Browse Forums Building Standards; Getting It Right! Re: Are you building in a problem soil area? 49Dec 23, 2014 8:51 am Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Are you building in a problem soil area? 50Dec 23, 2014 9:15 am This is a copy of Csiro foundation maintenance and footing performance. Has good info on soil types and type of movement that occurs on buildings. http://www.unitcare.com.au/pdfs/Foundat ... _csiro.pdf [Edit: Advertising links removed by moderator] Re: Are you building in a problem soil area? 51Dec 23, 2014 10:05 am Liliana Hi Insider, Thanks for the clarification about engineering principles. Mind you I didn't notice the drainage plumbers who had to re-lay our stormwater pipes worrying too much about how close to the foundations they were digging or at what angle nor did the plumbing inspector from the VBA seem concerned. I'm also still wondering where the VBA have got the "300mm" backfill figure from? I thought it was 100mm. The 300mm clay backfill is in AS 2870 under 5.6.3 drainage requirements Re: Are you building in a problem soil area? 52Dec 23, 2014 10:28 am StructuralBIMGuy Unfortunately there is always a lot of hearsay advice and its difficult to determine what's factual without testing , data and mathematics/Engineering simulations. If any of you guys can reference such work please post the links up. Also I have a question is your clay layer situated over rock or bearing (geological) substrate? Thanks referenced from AS 2870 5.6.3 drainage requirements and section C6 C6.4.1 figure C6.1 temporary excavations. The clay layer is in a backfilled plumbing trench so it is situated over crushed rock surrounding the plumbing pipes so is not situated over rock. Re: Are you building in a problem soil area? 53Dec 23, 2014 12:16 pm I thought that pipes weren't meant to be laid on crushed rock when situated on problem soil areas. I remember a engineer asking a plumber why did they do that. To which the plumber replied 'it's common practice' which the engineer asked "so does common practice mean it's good practice" and the plumber laughed and said NO! Re: Are you building in a problem soil area? 54Dec 24, 2014 9:12 am insider StructuralBIMGuy Unfortunately there is always a lot of hearsay advice and its difficult to determine what's factual without testing , data and mathematics/Engineering simulations. If any of you guys can reference such work please post the links up. Also I have a question is your clay layer situated over rock or bearing (geological) substrate? Thanks referenced from AS 2870 5.6.3 drainage requirements and section C6 C6.4.1 figure C6.1 temporary excavations. The clay layer is in a backfilled plumbing trench so it is situated over crushed rock surrounding the plumbing pipes so is not situated over rock. Thanks for the reply, I have copies of the standards What I am actually looking for is a profile or bore log of a site which has had problems in order to do some simulations Can anyone help? Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Are you building in a problem soil area? 55Dec 24, 2014 10:13 am StructuralBIMGuy insider StructuralBIMGuy Unfortunately there is always a lot of hearsay advice and its difficult to determine what's factual without testing , data and mathematics/Engineering simulations. If any of you guys can reference such work please post the links up. Also I have a question is your clay layer situated over rock or bearing (geological) substrate? Thanks referenced from AS 2870 5.6.3 drainage requirements and section C6 C6.4.1 figure C6.1 temporary excavations. The clay layer is in a backfilled plumbing trench so it is situated over crushed rock surrounding the plumbing pipes so is not situated over rock. Thanks for the reply, I have copies of the standards What I am actually looking for is a profile or bore log of a site which has had problems in order to do some simulations Can anyone help? Yes no problem. I can provide you with a soil profile including laboratory testing and heaved slab levels.I am currently conducting a stabilisation research project on a existing heaved house in the west of Melbourne for the last two years.It is a typical profile of a heave situation and I have been using two new stabilisation methods so I have a lot of information.I don't have laboratory tests from the vacant block before building unfortunately but just about everything else. Re: Are you building in a problem soil area? 56Dec 24, 2014 10:29 am Hi Insider Thanks, do you also have plans, engineering drawings etc for the affected sites etc Please leave a PM Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Are you building in a problem soil area? 58Dec 24, 2014 10:58 am Look I can't guarantee anything at the moment as I am flat out...Having said this I am pretty sure the problem is not going to go away any time soon. In order to do FEM simulations a lot of accurate data is required I am happy to have a crack at it (no pun intended, currently analyzing Slab cracking on sand soils here in perth) leave a PM Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Are you building in a problem soil area? 59Dec 24, 2014 11:24 am Ok One of the questions that needs to be answered is whether once the slabs have heaved are they able to return to close to their original position when the soil swell pressure has reduced.If not at what point do they go beyond the point of no return. Any information on these questions would be a great help. I'll send you a PM after christmas with the info Re: Are you building in a problem soil area? 60Dec 24, 2014 12:09 pm Unfortunately clay is subject to plastic deformation beyond such point the soil/footing will not return ( it is not elastic). The idea is to determine that point and to analyize the stresses on the structure and ways to deal with it.HTH Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs CDC Housing Code 3 When to apply Floor Area external face of wall vs Gross Floor Area internal face of wall. Reading thru CDC Housing Code 3, lets take a lot 915sqm.… 0 16538 Thanks for your reply. I will just wait and see I guess. Trying to get some more information from our builder. 9 30236 With that sort of soil type if you ask for a design to include piers then I would also include void formers. That way you should reduce the chances of settlement and heave. 7 4621 |