Title of Paper:基于峰后应力跌落速率及能量比的岩体脆性特征评价方法

Hits:

Date of Publication:2022-10-10

Journal:岩石力学与工程学报

Affiliation of Author(s):建设工程学部

Volume:35

Issue:6

Page Number:1141-1154

ISSN No.:1000-6915

Abstract:Brittleness is one of the important mechanical properties for rock mass
   and is also the key index in hydraulic fracturing,rock breakage and rock
   burst prediction. The calculation methods of brittleness indexes of rock
   in China and abroad were therefore summarized and their applicability
   was discussed. In order to evaluate the brittleness of rock mass
   reasonably,a new index was proposed based on the stress dropping rate
   after peak stress of stress-strain curve and the ratio of elastic energy
   release at the point of rock failure to total energy that stored before
   the peak stress. Then laboratory tests under different confining
   pressures were carried out using rock cores collected from the isolated
   and reservoir layers in Shengli oil field. Through the analysis of test
   results,the validity and superiority of the new brittleness index were
   verified. In addition,the jump of brittleness index of reservoir core
   under the confining pressure of 15 MPa illustrated that internal defects
   of brittle rock mass should be given much attention in practical work.

Note:新增回溯数据