Results 81 to 90 of about 128 (100)

Shock-synthesized hexagonal diamonds in Younger Dryas boundary sediments. [PDF]

Proc Natl Acad Sci U S A, 2009
Kennett DJ, Kennett JP, West A, West GJ, Bunch TE, Culleton BJ, Erlandson JM, Que Hee SS, Johnson JR, Mercer C, Shen F, Sellers M, Stafford TW, Stich A, Weaver JC, Wittke JH, Wolbach WS.   +16 more
europepmc   +1 more source

WATER AND SOIL PRESSURE CALCULATION METHOD FOR DEEP FOUNDATION PIT WITH SUSPENDED WATERPROOF CURTAIN IN WATER-RICH SANDY COBBLE STRATUM

International Journal of GEOMATE
openaire   +1 more source

Abstracts from the 37th Annual Meeting of the Society of General Internal Medicine, 2014, San Diego, CA, USA. [PDF]

J Gen Intern Med, 2014
europepmc   +1 more source

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Evolution of temperature field and frozen wall in sandy cobble stratum using LN2 freezing method

Applied Thermal Engineering, 2021
Abstract There is high risk of water inrush and ground collapse when tunneling in sandy cobble stratum in confined aquifer. Among various methods, artificial freezing method is an effective method to pre-reinforce the soft ground to prevent water inrush and ground collapse during tunneling.
Haomin Sang, Congcong Hou, Yongshui Kang   +2 more
exaly   +2 more sources

Study on the excavation disturbed zone during tunneling in sandy cobble stratum considering the material meso-structure

Transportation Geotechnics, 2021
Abstract The excavation disturbed zone plays an important role in the evaluation of tunnel stability. The identification of the excavation disturbed zone is perceived as a main concern. Taking the material meso-structure into account, this paper investigates the construction mechanical behavior in heterogeneous sand cobble stratum and aims to ...
Dechun Lu, Jilin Qi
exaly   +2 more sources

Model Testing on Failure Mechanism of Tunnel Face in Sandy Cobble Stratum

Arabian Journal for Science and Engineering, 2020
One of the universal problems in shield tunneling is face collapse caused by the sudden change of the soil in front of the tunnel face in weak sandy pebble stratum. In order to control the sudden change of the soil, the model test method is used to study the stability of the tunnel face in the sandy pebble stratum.
Zhang Junwei
exaly   +2 more sources

A multi-scale analysis method for the simulation of tunnel excavation in sandy cobble stratum

Tunnelling and Underground Space Technology, 2019
Abstract Sandy cobble stratum is a kind of heterogeneous geological body. A further study on the safety of wall rocks and underground structure demands developing suitable analysis method to simulate tunnel excavation in such a formation. Macro-scale simulations assume the sandy cobble soil to be homogeneous in numerical models.
Dechun Lu
exaly   +2 more sources

Three-Dimensional Limit Equilibrium Solution of Minimum Support Pressure of Shield Tunnel Face in Sandy Cobble Stratum

Arabian Journal for Science and Engineering, 2021
The ground subsidence accident caused by the instability of shield tunnel face has been a major problem that puzzles urban subway construction in weak rock. Maintaining the stability of tunnel face is the key to ensure the safety of shield construction and reduce the environmental impact.
Zhang Junwei, Zhang Junwei
exaly   +2 more sources

Ground collapse caused by shield tunneling in sandy cobble stratum and its control measures

Bulletin of Engineering Geology and the Environment, 2020
This study investigated several ground collapses in sandy cobble strata induced by shield tunneling in two intervals of Lanzhou Metro Line 1 and proposed corresponding control measures. Ground collapses were classified into three types (A, B, and C). The distribution of low-compactness zones was the primary cause of the collapses that occurred after ...
Honggui Di, Honggui Di, Shunhua Zhou
exaly   +2 more sources