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Preliminary Tri-Axial Mechanical Test on the Hydrate-Bearing Media from Shenhu Area of South China Sea under High Confining Pressures
Received date: 2016-11-23
Revised date: 2017-01-03
Online published: 2017-02-28
In order to understand the geological and mechanical characteristics of the methane hydrate-bearing sediments in Shenhu area of South China Sea, a group of preliminary tri-axial mechanical tests were carried out. The temperatures were set as 2oC and 5oC separately, and the scope of the confining pressure was 9 MPa ~ 15 MPa, with hydrate content of 50%. The results indicate that the axial stresses, deviator stresses and elasticity modulus show similar changes according to the confining pressure. They increase with the confining pressures before 12 MPa. In the range of 12 MPa ~ 14 MPa they reach their peaks and then begin to decline. The peak of the stress-strain relationships at the two temperatures are different, it decreases firstly and then increases at 2oC, but increases firstly and then decreases at 5oC. The axial stress, deviator stress and elasticity modulus at 2oC are larger than at 5oC, and the stress/strain changes at 2oC&15 MPa are also larger than at 5oC&10 MPa respectively. It proves that the hydrate-bearing porous media possess a stronger mechanical strength under the surroundings of high pressure and low temperature.
GUAN Jin-an , LU Jing-sheng , LIANG De-qing , LI Dong-liang , WAN Li-hua . Preliminary Tri-Axial Mechanical Test on the Hydrate-Bearing Media from Shenhu Area of South China Sea under High Confining Pressures[J]. Advances in New and Renewable Energy, 2017 , 5(1) : 40 -46 . DOI: 10.3969/j.issn.2095-560X.2017.01.006
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