CAJ | 학술논문

天然岩体在长期地质作用下会生成各种节理裂隙等不连续面，而地下工程结构的稳定性一般取决于这些不连续面的强度。在众多因素中，表面形态对岩石节理面剪切强度具有决定性影响。为了系统研究岩石节理面剪切强度的确定方法，把岩石节理面概化为一系列高度不同的微长方体凸起组成的粗糙表面结构，且微长方体凸起有剪胀破坏和非剪胀破坏两种模式。综合微长方体凸起破坏规律，应用概率密度函数描述节理面表面起伏分布的影响，建立了粗糙节理面随机强度模型，推导了节理面剪切强度理论公式，提出了节理面强度的随机评价方法。基于随机强度模型和评价方法编制Matlab计算程序计算自然粗糙节理面的剪切强度，并将计算结果与试验结果进行比较分析。研究表明：粗糙节理面随机强度模型综合了粗糙节理面表面形态和法向应力对节理剪切强度的影响机制，理论计算值与试验数据吻合良好，可以较好的评价粗糙节理的峰值剪切强度和残余剪切强度。该随机模型可作为进一步深入研究的重要基础，分析结构面的连续剪切过程，建立更完善的节理面强度模型。
천연암체재장기지질작용하회생성각충절리렬극등불련속면，이지하공정결구적은정성일반취결우저사불련속면적강도。재음다인소중，표면형태대암석절리면전절강도구유결정성영향。위료계통연구암석절리면전절강도적학정방법，파암석절리면개화위일계렬고도불동적미장방체철기조성적조조표면결구，차미장방체철기유전창파배화비전창파배량충모식。종합미장방체철기파배규률，응용개솔밀도함수묘술절리면표면기복분포적영향，건립료조조절리면수궤강도모형，추도료절리면전절강도이론공식，제출료절리면강도적수궤평개방법。기우수궤강도모형화평개방법편제Matlab계산정서계산자연조조절리면적전절강도，병장계산결과여시험결과진행비교분석。연구표명：조조절리면수궤강도모형종합료조조절리면표면형태화법향응력대절리전절강도적영향궤제，이론계산치여시험수거문합량호，가이교호적평개조조절리적봉치전절강도화잔여전절강도。해수궤모형가작위진일보심입연구적중요기출，분석결구면적련속전절과정，건립경완선적절리면강도모형。
Jointed rockmass is involved in many civil engineerings. Correct assessment of the shear strength of rock joint surfaces is essential for such projects design. However, there are various factors to affect shear strength of rock joints. Among them, the surface shape of the structure plane is vitally important for its mechanical property because the surface shape affects the real area of contact and frictional status definitively. In this study, the rough joint surface is considered to be made up of a series of microcosmic rectangular-shaped asperities with different heights. There might be two failure modes of a rectangular asperity: a dilative failure mode and a non-dilative failure mode, although the rough joint surfaces show macroscopic shear-dilatancy failure in most cases. Based on them, the stochastic strength model of rough joint surfaces is established by applying the probability density function to describe the asperity height distribution. The shear strength is theoretically derived according to the proposed model. Direct shear tests on artificial rough joint surfaces are performed to verify the proposed stochastic model and its application method. The theoretical computations of stochastic model provide a good agreement with the obtained peak shear strength and residual shear strength from shear tests, which may serve as an effective approach for quantitatively estimating the peak shear strength and residual shear strength of rock joint surfaces.