scholarly journals Analysis and Measurements of Behaviors of Rock around Under-ground Cavity in the Process of Excavation

1974 ◽  
Vol 23 (248) ◽  
pp. 341-348
Author(s):  
Minoru YOSHIDA
Keyword(s):  
Ground Cavity

Influence of Cavity above Tunnel on Stratum Deformation and Failure in Urban Tunnelling

2012 ◽  
Vol 170-173 ◽  
pp. 1810-1815
Author(s):  
Yanan Zhang ◽  
Cheng Ping Zhang ◽  
Qian Qian Li ◽  
Zheng Li ◽  
Yi Cai
Keyword(s):  
Failure Process ◽  
Test Method ◽  
Test Results ◽  
Tunnel Engineering ◽  
Deformation And Failure ◽  
Tunnel Section ◽  
Section Size ◽  
Ground Cavity ◽  
Stratum Deformation ◽  
Beijing Subway

In order to study the influence of cavity above the tunnel on stratum deformation and failure in urban tunnelling, the model test method was adopted based on the parameters of the stratum and tunnel section size in Beijing subway. The stratum responses were obtained under the conditions without ground cavity and with ground cavity above the tunnel. The responses include the stratum stress distribution, stratum settlement law and stratum failure process. It was concluded that the existence of ground cavity above the tunnel worsened the stratum condition and accelerated the progress of stratum deformation and failure. Furthermore, the failure began from the cavity and the damage scope was bigger than that under the condition without cavity according to the test results. The research results can be referenced for the similar tunnel engineering.

The Deep-Basined Metate of the Southern California Coast

1954 ◽  
Vol 19 (4) ◽  
pp. 394-396 ◽  
Author(s):  
Albert Mohr
Keyword(s):  
River Basin ◽  
Southern California ◽  
Smithsonian Institution ◽  
Interesting Problem ◽  
Santa Barbara ◽  
California Coast ◽  
Santa Barbara County ◽  
Ground Cavity ◽  
The Way

Deep-basined metates are frequently found in early sites on the southern California coast, but the faces of the accompanying manos usually are only moderately convex. Mano faces examined by the writer never have been sufficiently excurvate to make contact with the grinding surfaces of the deeply ground metates. This presents an interesting problem: how were the manos manipulated on the metates?An examination of specimens from Oak Grove sites 7, 21, and 79 (Rogers, 1929) and the Smithsonian Institution River Basin Surveys’ sites 4SBa477 and 4SBa485 in Santa Barbara County, California, reveals the following associations and characteristics. Slab, shallow-basined, and deep-basined metates are found in association. The first two types exhibit an unbroken grinding area, but specimens of the latter almost invariably have a slight shoulder running at least a part of the way around the basin, the transition between a slightly concave ground area and the deeply ground cavity.

Ground cavity nest temperatures and their relevance to Blue Swallow Hirundo atrocaerulea conservation

Ostrich ◽  
2013 ◽  
Vol 84 (3) ◽  
pp. 221-226 ◽  
Author(s):  
James Wakelin ◽  
Amy-Leigh Wilson ◽  
Colleen T Downs
Keyword(s):  
Cavity Nest ◽  
Ground Cavity
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