Mechanical Properties And Researches Of Roadway Supporting Technology Of Oil Shale Under The Action Of Water

Oil gas of oil shale arouses concern among the world as an important alternative energywith giant reserves and abundant multipurpose use levels. In our country, oil shale is mainlyexploited in the manner of underground mining and with the effect of underground water, thesurrounding rock of the roadway is transformed in higher speed and larger deformation and therheological property is more significant. It is a big problem to restrict the exploitation of oil shalein our country. On the domestic, under the background of an important oil shale production basein our country-Jilin Huadian oil shale mine, with the method of experiment, theoretical analysisand numerical simulation, the oil shale mechanics characteristic under the effect of undergroundwater and its apply in the analysis of roadway rock stability are studied systematically andintensively. The main content and achievement are as follows:(1) In Jilin Huadian oil shale mine, the rock samples are drilled and tested by conventionaltriaxial compression, true triaxial compression and triaxial creep. The Instantaneous deformationcharacteristics and damage characteristics, the effect on deformation damage by intermediatestress, the creep characteristic and influencing factors, the creep mechanism are analysed. Andthese are prepared for the comparison with mechanics properties of rock containing water.(2) Water’s impact on mechanics characteristic of rock is studied. Homotaxial and triaxialcompression experiment under different water containing statuses and triaxial creep experimentunder different water containing statuses and different pore pressure are conducted. Theinfluence of different water ratio and pressure on the mechanics characteristic of oil shale isstudied.(3) With the analysis of basic mechanical characteristic and creep characteristic of oil shale,based on Burger model, combining Berger model and a plastic component which fits plastic flowlaw, an improved Burger model, which is cvisc model, is built. Based on the result of saturatedwater creep experiment, making use of non-linear least squares, the changing regularity of creepparameters adapted to time and stress in cvisc model has been analyzed, and the relationalexpression about creep parameters changing with time and stress has been established, and thencreep equation of oil shale is established, considering timeliness and saturated conditions.(4) Combining the fluid-solid coupling equations and the creep equations under saturatedcondition, the seepage-creep coupling mechanical model considering timeliness is built. And theprogram of this model is developed under the secondary development platform of FLAC3D. By solving this program with numerical method, the surrounding rock creep deformationcharacteristics under the water-rock coupling interaction condition and creep control effect aresimulated.(5) Based on theoretical analysis, laboratory experiment and numerical simulation, couplingsupport scheme centering on drill grouted anchor bar is put forward. Field test is performed inthe surrounding rock controlling test section of main haulage roadway of the first well in JilinHuadian oil shale mine. On the site practice, coupling support scheme centering on drill groutedanchor bar has a positive effect on the control of surrounding rock which is under gleization andit offers experience for the deformation control of very soft surrounding rock.