Single-borehole measuring method for broken rock zone in gently inclined thin layer weakness structure |
| |
Authors: | Qing-fa Chen Ke-ping Zhou Teng-teng Long Feng Gao |
| |
Affiliation: | [1]School of Resources and Safety Engineering, Central South University, Changsha 410083, China [2]College of Resources and Environment, Guangxi University, Nanning 530004, China |
| |
Abstract: | According to the structural characteristics of gently inclined thin layer rock mass in which lots of weak interlayer existed,
the concept of gently inclined thin layer weakness structure was proposed. If single-borehole measuring method of the acoustic
along the conventional arrangement mode was used in measuring the broken rock zone in this structure, the change of the relationship
curves (V
p
-L) between acoustic p-wave velocity (V
p
) and borehole depth (L) would present the irregular feature due to the mechanical characteristics of layered rock mass and harmful effects of weak
interlayers, and the scope of broken rock zone couldn’t be defined quickly. Based on the analysis of the mechanical characteristics
of layered rock mass, the propagation rule of acoustic and distributions characteristics of plastic zone and slip zone in
layered rock mass, new arrangement mode of acoustic measuring boreholes for broken rock zone in gently inclined thin layer
weakness structure was proposed. Namely, the measuring boreholes in two sides were parallel to the strata, the measuring boreholes
in the roof and floor perpendicular to the strata. Besides the controlling depth of the measuring boreholes in the scope of
the large plastic zones or the large slip zones should be increased. Engineering example showed that new acoustic measuring
boreholes arrangement mode had the better applicability and could determine the scope of the broken rock zone in the gently
inclined thin layer weakness structure quickly.
Supported by the National Natural Science Foundation of China(50490274); National Key Project of Scientific and Technical
Supporting Programs of China(2006BAB02A02); Guangxi University Research Foundation (X061068) |
| |
Keywords: | single-borehole measuring method broken rock zone gently inclined thin layer weakness structure acoustic measuring |
本文献已被 维普 SpringerLink 等数据库收录! |
|