CAJ | 학술논문

节理表面形貌是影响节理峰值抗剪强度的重要因素,采用人工模拟材料节理分别在0.5,1.0,1.5,2.0,3.0 MPa的法向应力下进行直剪试验,研究三维形貌参数与峰值抗剪强度之间的关系.选用节理面有效三维平均倾角θ、粗糙度系数R 、最大可能接触面积比0A 作为表征节理面粗糙度的参数.直剪试验前、后采用TJXW–3D型S便携式岩石表面形貌测量仪对节理表面进行形貌数据测试;根据直剪试验结果建立节理峰值剪胀角与三维形貌参数3sθ, SR ,0A 之间的关系;建议采用新的强度准则计算节理的峰值抗剪强度.新公式的计算结果与试验值具有较好的一致性,并将其与Barton公式的计算结果进行比较,可知Barton公式的计算结果低于试验实测值.3s
절리표면형모시영향절리봉치항전강도적중요인소,채용인공모의재료절리분별재0.5,1.0,1.5,2.0,3.0 MPa적법향응력하진행직전시험,연구삼유형모삼수여봉치항전강도지간적관계.선용절리면유효삼유평균경각θ、조조도계수R 、최대가능접촉면적비0A 작위표정절리면조조도적삼수.직전시험전、후채용TJXW–3D형S편휴식암석표면형모측량의대절리표면진행형모수거측시;근거직전시험결과건립절리봉치전창각여삼유형모삼수3sθ, SR ,0A 지간적관계;건의채용신적강도준칙계산절리적봉치항전강도.신공식적계산결과여시험치구유교호적일치성,병장기여Barton공식적계산결과진행비교,가지Barton공식적계산결과저우시험실측치.3s
Joint surface morphology is one of the most important factors for peak shear strength of jointed rock. Artificial joints are used for direct shear tests under five levels of normal stresses,i. e. 0.5,1.0,1.5,2.0,3.0 MPa, to study the relationship between 3D morphology parameters and peak shear strength. Effective joint surface 3D mean angle 3sθ ,surface roughness coefficient R and the maximum possible contact area ratio 0A are selected to S describe the joint roughness. Scanning joint surface after each direct shear tests by TJXW–3D topography scanner and the above selective morphology parameters are calculated. A new peak shear dilation angle model is proposed with relationship to 3D morphology parameters of 3sθ , R , 0A . Then,a new strength criterion with S three morphology parameters is suggested for modeling the peak shear strength of rock joints. A comparison between the proposed models and the experimental results show a relatively good agreement. At last,the calculated results by the new criterion is compared to the well-known Barton′s criterion. It is shown that Barton′s criterion underestimates the observed peak strength.