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HOW MUCH ANGULAR DISTORTION ARE ALLOWED IN RAILWAY TRACKS? WE ARE ENGAGED IN CONSTRUCTION OF UNDERGROUND METRO STATION IN KOLKATA. OUR CLIENT SPECIFIES A ANGULAR DISTORTION VALUE OF 1 IN 1000, WHICH IS TOO TIGHT FOR US. WE ARE REACHING ANGULAR DISTORTION 1 IN 600 IN OUR ANALYSIS. PRESENTLY WE...

Please recommend some allowable FOS values against Toe Kickouts of Diaphgram Walls for deep excavation in calys, Thanks in advance Debasis

We are simulating deep excavation problem in clays using Plaxis 2D v10 software. After certain stages the problem is not converging and showing error message as 'Load advancement procedure fails'. The same problem we tried in Plaxis 2D V11 and it computed successfully. Some users has reported...

In Plaxis two methods are suggested for performing undrained analysis in clays. Method A is performed utilising drained strength & stiffness parameters, consolidation is followed by staged construction. Method B is total stress analysis using undrained strength parameters & drained stiffness...

We have installed one Vibrating Wire Piezometer inside the excavation area whose tip is 25m below ground surface. Initial reading on 23.11.2011 indiactes pore pressure of 0.177MPa. Till 28.04.12 the reading was fixed at level of 0.161MPa. We found changes in reading of pore pressure measured...

During excavating trench for Diaphragm Wall Panel construction what are the different failure patterns need to be considered that should be incorporated during design considerations? Are there any requirements to provide Stop Ends for the full length of the trench during excavation in Clays?

Are there any chances of consolidation during periods of deep excavations in Clay?Please provide some suitable references on this topic. Regards Debasis

In Diaphragm Wall analysis by FEM methods we found that Toe Kickout's are occuring giving significant movements. Is this phenomenon has any impact on construction of Diaphragm wall and its further stability. Please provide some suitable references on case studies of Toe Kickouts if available...

What should be minimum cover criteria for tunnels in soft clay? In our present problem, the soil cover above TBM tunnel is ~1D and we are planning to construct a subway above the tunnel when the cover between Tunnel Crown & Subway bottom will be <1D. Our concern is what should be the stability...

We are constructing Underground Station box using Top-Down sequences.We have reached excavation till Concourse Level & found some anomaly in behavior of Strain Gauges & Load Cells. We proposed to use steel struts at four consecutive levels to support the excavation pit from time to time against...

We have installed Vibrating Wire Piezometer in Underground Metro site construction at 25m depth from ground. The initial reading recorded was 0.177MPa on Nov-11 & present reading is 0.159MPa.As per AAA levels the 'Alarm Level' proposed for change in pressure is 0.20MPa. Our latest readings shows...

We are constructing Diaphragm Wall for construction of Underground Station box by Top-Down sequences.Recently the client has proposed Diaphragm Wall Panel load test on 1 in every 400m.I found that you have conducted load tests on panels for previous projects as per case studies.Please provide...

We have installed Vibrating Wire Piezometer in Underground Metro site construction at 25m depth from ground. If the pore pressure as per Vibrating Wire Piezometer reading is 0.16 MPa presently where is the GWT presently? Though as per bore logs observations GWT is 3-4m below ground surface we...

Has anyone worked on London Clay in relations to deep excavations & bored tunnelling? I am looking the perfect soil model that needs to be applied in the numerical analysis. I got some references where people prefer to use Modified Cam Clay theory on this type of soil. How much this theory is...

Hello In bored tunnel problems how the term 'Tunnel Contraction' works? On what basis this value is fixed? I applied a '2% volume loss of ground' as 'Tunnel Contraction' in my problem. I found increasing the stiffness's and strength parameters of soil mass increases the deformations of tunnel...

Hello We are proposing Contiguous Bored Pile walls as retaining earth for Highway schemes.I was wondering how to hold the soil between the piles.Is there any minimum spacing criteria between the piles so that soil mass is stabilised.What are the drainage arrangements to be proposed in case...

Hello Can anyone provide some references on Bored pile construction techniques in sloping ground, Thanks in advance Debasis

Hello I am looking for literatures,course notes,referrences on drainage arrangements for earthworks retained by steel sheet pile wall. Any sort of guidances are most welcome, Regards Debasis

refering the post in thread274-164288, 1) How to determine size of the rock dowels, eg Y25, or Y32? You have to start from some dia of rock dowels, determine the capacity and install the dowels in your numerical models.You have to see how much support pressure does the dowels provide to get...

refering to thread256-213370, You can refer this book 'The art of tunnelling? by by Károly Széchy', it gives ideas on behaviour of soils and tunnelling including design discussions, Regards Debasis