Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2024. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ Stability analysis of jointed rock mass in large underground caverns based on multi-scale analysis method https://trid.trb.org/View/2249002 Mon, 16 Oct 2023 17:25:05 GMT https://trid.trb.org/View/2249002 Centrifugal model test study on deformation characteristics of deep, thick fillings in giant karst cave tunnels under different construction processes https://trid.trb.org/View/2221596 Mon, 28 Aug 2023 09:34:04 GMT https://trid.trb.org/View/2221596 Structures and Settlement Control of Yujingshan High-Speed Railway Tunnel Crossing Massive Rockfill in a Giant Karst Cave https://trid.trb.org/View/1900462 Wed, 29 Dec 2021 15:58:10 GMT https://trid.trb.org/View/1900462 Observed Performance and Analysis of SEM Cavern Construction in Downtown Los Angeles https://trid.trb.org/View/1877431 Wed, 22 Sep 2021 12:03:05 GMT https://trid.trb.org/View/1877431 Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock https://trid.trb.org/View/1859766 Fri, 25 Jun 2021 18:37:34 GMT https://trid.trb.org/View/1859766 Time-Frequency Analysis of GPR Simulation Signals for Tunnel Cavern Fillings Based on Short-Time Fourier Transform https://trid.trb.org/View/1848396 Tue, 25 May 2021 16:20:02 GMT https://trid.trb.org/View/1848396 Complex Analysis of Ground Deformation and Stress for a Shallow Circular Tunnel with a Cavern in the Strata considering the Gravity Condition https://trid.trb.org/View/1646175 Tue, 22 Oct 2019 14:42:34 GMT https://trid.trb.org/View/1646175 Roadway Engineering Mechanical Properties and Roadway Structural Instability Mechanisms in Deep Wells https://trid.trb.org/View/1510061 Mon, 25 Jun 2018 13:49:43 GMT https://trid.trb.org/View/1510061 Minimizing the use of concrete in tunnels and caverns: comparing NATM and NMT https://trid.trb.org/View/1480728 2000 case record based) the so-called Q-system of rock mass quality estimation. The latter encompasses a rock mass quality scale from 0.001 (equivalent to a serious fault zone, where we also may need a local concrete lining) to 1000 (equivalent to massive unjointed rock) where careful blasting will remove the need even for shotcrete. In general, rock masses where we need tunnels or caverns will lie closer to ‘mid-range’ (i.e. closer to Q = 1 which is described as ‘poor quality’). Here we would need combinations of corrosion-protected rock bolts and high quality fibre-reinforced shotcrete, with stainless steel or polypropylene fibres. We may also need systematic high-pressure pre-injection of micro-cement and micro-silica, which may add 20% to the (low) starting cost of the NMT excavation. Written as B + S(fr) in short-hand, NMT has rock bolt c/c spacing in metres and shotcrete thickness in centimetres, as specified by the range of Q values and excavation dimensions. The details are also affected by the planned use. For instance, at our record-breaking Olympic cavern of 60 m span (for housing 5400 spectators or later concert goers), B = 2.5 m c/c + S(fr) 10 cm were (and remain 25 years later) the stabilizing and permanent measures of support and reinforcement. Deformation monitoring and distinct element (jointed rock) numerical verification showed 7–8 mm of maximum deformation in the arch. The moderate Q value range of quality of 2–30 (poor/fair/good) and RQD = 60–90 indicated a well-jointed gneiss, which had only moderate UCS = 90 MPa compressive strength.]]> Tue, 29 Aug 2017 10:09:22 GMT https://trid.trb.org/View/1480728 Remediation of Karst Phenomena Along the Croatian Highways https://trid.trb.org/View/1460698 Fri, 31 Mar 2017 17:10:04 GMT https://trid.trb.org/View/1460698 SEM Crossover Cavern in Downtown L.A. https://trid.trb.org/View/1397879 Mon, 02 May 2016 10:15:35 GMT https://trid.trb.org/View/1397879 A triple lift https://trid.trb.org/View/1351094 Mon, 27 Apr 2015 09:48:57 GMT https://trid.trb.org/View/1351094 Stability Analysis and Application of an Underground Water-Sealed Rock Cavern Block https://trid.trb.org/View/1334722 Mon, 29 Dec 2014 11:30:34 GMT https://trid.trb.org/View/1334722 Modeling and Simulation for Complex Faults of Large-Scale Underground Caverns Based on FLAC3D https://trid.trb.org/View/1316597 Tue, 02 Sep 2014 09:06:18 GMT https://trid.trb.org/View/1316597 Study on the Reasonable Rise-Span Ratio of Crown for Underground Powerhouses https://trid.trb.org/View/1310302 Fri, 27 Jun 2014 17:02:55 GMT https://trid.trb.org/View/1310302