Advertisement

Topics

Prediction of roof supporting pressure for shallow tunnels in layered soils incorporating the effect of pore water pressure.

08:00 EDT 13th June 2019 | BioPortfolio

Summary of "Prediction of roof supporting pressure for shallow tunnels in layered soils incorporating the effect of pore water pressure."

In this study, we propose a method for predicting the supporting pressure required for shallow tunnels in layered soils, based on a curved roof collapse mechanism with multi-failure surfaces. In this method, the effect of the number and thickness of soil layers, pore water pressure, arbitrary roof profile, and ground additional load is considered simultaneously. A nonlinear power-law failure criterion is employed to describe the failure characteristics of the roof soils. The internal energy dissipation rate and the work rates produced by external forces are obtained based on the associated flow rule and plasticity potential theory. The analytical expressions of the required supporting pressure and roof collapse surfaces are obtained with the upper bound method. Furtherly, a shallow rectangular tunnel in two soil layers is selected for parametric investigation. The change laws of the required supporting pressure and collapse curves under varying parameters are obtained. Furthermore, the corresponding engineering recommendations are given, which may potentially provide references for the support design and construction of shallow tunnels in layered strata.

Affiliation

Journal Details

This article was published in the following journal.

Name: PloS one
ISSN: 1932-6203
Pages: e0217351

Links

DeepDyve research library

PubMed Articles [9208 Associated PubMed Articles listed on BioPortfolio]

Studies on effects of traffic tunnels on the migration of the contaminants under landfill sites.

Three landfills are located in the eastern part of the Chengdu City, and two traffic tunnels pass beneath the south portion of landfill-1. The landfills have a simple leachate collection system withou...

An acoustic emission characterization of the failure process of shallow foundation resting on sandy soils.

Shallow foundation is a common foundation type that is usually used for small to medium size structures. The bearing ability and the failure mechanism of shallow foundation are the fundamental concern...

The microbiome of tunnels in hidradenitis suppurativa patients.

Hidradenitis Suppurativa (HS) is a chronic inflammatory skin disease defined by recurrent nodules, tunnels and scarring involving the intertriginous regions. Recent Next Generation Sequencing (NGS) st...

Generation of the squamous epithelial roof of the 4 ventricle.

We use the transparency of zebrafish embryos to reveal the generation of a simple squamous epithelium and identify the cellular architecture in the epithelial transition zone that ties this squamous ...

Hexagonal Layered Polymeric Nitrogen Phase Synthesized near 250 GPa.

The nitrogen triple bond dissociates in the 100 GPa pressure range and a rich variety of single-bonded polymeric nitrogen structures unique to this element have been predicted up to the terapascal pr...

Clinical Trials [5047 Associated Clinical Trials listed on BioPortfolio]

Continuous Positive Airway Pressure and Oxygen Concentration on Measurement of Rapid Shallow Breathing Index

To compare the rapid shallow breathing index (RSBI) values, the incidence of adverse reactions, and the predictive accuracy measured under 5 different ventilator strategies in the same pat...

The Relationship Between Trans-diaphragmatic Pressure and Diaphragmatic Contraction

Through this study the investigators aim to clarify the relationship between trans-diaphragmatic pressure and various parameters of the diaphragmatic contraction evaluated by ultrasound. T...

Anterior Cruciate Ligament (ACL) Reconstruction Using Different Grafts and Surgical Techniques

ACL reconstruction in the Division of Orthopaedic surgery at Queen's is currently being performed arthroscopically assisted. The resultant function of the reconstructed ligament is greatly...

FLACS vs Phaco in Shallow Anterior Chamber

Phacoemulsification in eyes with a shallow anterior chamber (ACD < 2.2mm) presents with problems of safe access to the cataract and increased vulnerability of the endothelium and a higher ...

Surgical Treatment for Acute Patella Tendon Rupture

We will compare two groups for acute patella tendon repair: one treated with surgical anchors and the second, with transpatellar tunnels.

Medical and Biotech [MESH] Definitions

Double-layered inflatable suits which, when inflated, exert pressure on the lower part of the wearer's body. The suits are used to improve or stabilize the circulatory state, i.e., to prevent hypotension, control hemorrhage, and regulate blood pressure. The suits are also used by pilots under positive acceleration.

The pressure within the CARDIAC ATRIUM. It can be measured directly by using a pressure catheter (see HEART CATHETERIZATION). It can be also estimated using various imaging techniques or other pressure readings such as PULMONARY CAPILLARY WEDGE PRESSURE (an estimate of left atrial pressure) and CENTRAL VENOUS PRESSURE (an estimate of right atrial pressure).

Predicting the time of OVULATION can be achieved by measuring the preovulatory elevation of ESTRADIOL; LUTEINIZING HORMONE or other hormones in BLOOD or URINE. Accuracy of ovulation prediction depends on the completeness of the hormone profiles, and the ability to determine the preovulatory LH peak.

The blood pressure in the VEINS. It is usually measured to assess the filling PRESSURE to the HEART VENTRICLE.

Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Searches Linking to this Article