CAJ | 학술논문

岩石是一种非均质材料并含有各种缺陷，利用岩样的应力应交全程曲线可以确定理想强度，在排除岩样缺陷后讨论峰值强度与围压的关系，即强度准则。通过岩样剪切破坏后保持轴向变形恒定降低围压试验，可以确定岩样由摩擦力维持的承载能力随围压的变化关系。比较峰值强度和残余强度随围压变化关系的异同，可以研究岩样屈服过程中内摩擦系数的变化情况，以及内摩擦力对岩样变形特性的影响。粉砂岩试样在峰值应方时内摩擦系数已经达到最大值，峰后只是粘结力或者说是材料强度的降低过程，围压对变形没有明显影响。大理岩试样屈服过程中内摩擦系数不断增加，而内摩擦力的增加量与围压有关，高围压时只有材料强度完全丧失之后，由内摩擦力达到岩样的承载极限。内摩擦力系数随屈服过程增大，是岩石由脆性转交为廷性的根本原因。
암석시일충비균질재료병함유각충결함，이용암양적응력응교전정곡선가이학정이상강도，재배제암양결함후토론봉치강도여위압적관계，즉강도준칙。통과암양전절파배후보지축향변형항정강저위압시험，가이학정암양유마찰력유지적승재능력수위압적변화관계。비교봉치강도화잔여강도수위압변화관계적이동，가이연구암양굴복과정중내마찰계수적변화정황，이급내마찰력대암양변형특성적영향。분사암시양재봉치응방시내마찰계수이경체도최대치，봉후지시점결력혹자설시재료강도적강저과정，위압대변형몰유명현영향。대리암시양굴복과정중내마찰계수불단증가，이내마찰력적증가량여위압유관，고위압시지유재료강도완전상실지후，유내마찰력체도암양적승재겁한。내마찰력계수수굴복과정증대，시암석유취성전교위정성적근본원인。
Rock is heterogeneous material with various flaws. The ideal strength of rock specimen can be determined from its complete stress-strain curve. After specimen is failed the experiment, reducing confining pressure and keeping the constant axial deformation, was carried out. According to the experiment the relationship of loading capacity of specimen, which is sustained by the internal friction, with confning pressure is given. To compare the relations of residual strength and peak strength with confining pressure,the internal friction coefficient in the yielding process is studied. The effect of internal friction coefficient on deformation and strength of various rock specimens is discussed. For siltsand, the internal friction coefficient reaches the maximum at the peak strength, and then the cohesion or material strength decreases only, so the confining pressure does not influence the specimen' s deformation beyond the peak stress.For marble, the internal friction coefficient increases in the whole yielding, and the increasing of internal friction is various with the normal stress on the shear surface or confining pressure. At high confining pressure, the maxitmum axial stress is realized by internal friction when material strength of the specimen has wholly lost. The increasing of internal friction coefficient results in the transformation of brittle to ductile.