剪切过程中岩石节理面形貌与应力演化研究
发布时间：2018-08-15 16:20
【摘要】：节理面通常是岩体的薄弱面,在实际工程中岩体的破坏大多因节理引起,而节理表面几何形态又是控制岩体力学的重要因素。基于此,本文主要研究了规则形状与随机形状的节理面在剪切过程中形貌与应力的演化规律,主要成果如下:(1)剪切过程中锯齿状节理面的形貌变化:形貌的高度均方根与坡度均方根的变化规律为:初期较平缓,之后断崖式下跌,最后趋近平稳;自相关函数曲线几乎水平不变。(2)剪切过程中锯齿状节理面的应力演化:节理面附近区域的拉应力曲线呈起伏波浪状,其绝大多数峰值点约为0.5·σn'。节理面附近区域的压应力曲线呈矩形脉冲状,其曲线的下限值约为-2.5·σn。接触压应力曲线呈矩形脉冲状,曲线近似为同周期恒振幅的振荡变化,波动范围为(0.2～1.5)Λσn。剪应力曲线呈矩形脉冲状,曲线波动范围是f.(0.2～1.5)·σ.n,形貌变化对剪切应力的贡献为0.2·σn ·f,剪应力与接触压应力的比值为摩擦系数。节理面最小接触面积与全接触面积的比值为26.7%。节理面的张开距离呈现周期性。(3)剪切过程中JRC曲线节理面的形貌变化:形貌的的高度均方根、坡度均方根、自相关函数逐渐减小,最后趋于稳定。(4)剪切过程中JRC曲线形貌节理面的应力演化:不同形貌节理面附近区域的拉应力、压应力差异极大;相同形貌节理面附近区域的压应力与拉应力规律类似,其出现峰值的位置也接近,峰点处其值较大,随着远离各峰点其值趋近于0。不同形貌的接触压应力、剪应力差异极大;相同形貌的接触压应力与剪应力规律类似且出现峰值的位置接近。接触压应力、剪应力的峰点处其值较大,随着远离各峰点其值趋近于0。整个剪切过程中应力曲线的峰值个数点逐渐减少。同一剪切试验剪应力与接触压应力的比值为摩擦系数。张开距离的变化为:曲线急剧上升至峰值点,再下降,最后趋近水平。不同的JRC节理形貌接触面积曲线变化规律基本相同,接触面积与剪切位移可以拟合为y=axb曲线。
[Abstract]:Joint plane is usually the weak plane of rock mass. In practical engineering, the failure of rock mass is mostly caused by joint, and the geometry of joint surface is an important factor to control rock mechanics. Based on this, the evolution of the shape and stress of joints with regular shape and random shape in shear process is studied in this paper. The main results are as follows: (1) the morphologies of sawtooth joints during shearing: the variation law of the high RMS and the RMS of slope is: the initial stage is relatively flat, then the cliff-like decline, and the final approach is stable; The autocorrelation function curve is almost constant. (2) the stress evolution of sawtooth joints in shear process: the tensile stress curves near the joints show undulating wave shape, and most of the peak points are about 0.5 蟽 ng. The compressive stress curve near the joint surface is rectangular pulse shape, and the lower limit of the curve is about -2.5 蟽 n. The contact compressive stress curve shows a rectangular pulse shape, and the curve is approximately oscillatory with the same period and constant amplitude, and the fluctuation range is (0.22 ~ (1.5) A 蟽 ~ (n). The shear stress curve is rectangular pulse shape, the fluctuation range of the curve is f. (0.2n. 5) 蟽. N. The contribution of the shape change to the shear stress is 0.2 蟽 n f, and the ratio of shear stress to contact compressive stress is friction coefficient. The ratio of the minimum contact area to the total contact area of the joint plane is 26.7. The opening distance of joint surface is periodic. (3) the morphology of JRC curve joints changes: the height of RMS root of morphology, the root of slope RMS, the autocorrelation function decrease gradually. (4) the stress evolution of the joint surface of the JRC curve during shear process: the tensile stress in the region near the joint plane with different morphologies varies greatly, the compressive stress in the area near the same joint surface is similar to the tensile stress law, and the stress evolution of the joint plane is similar to that of the tensile stress in the region near the same surface. The position of the peak value is close, the value of the peak point is larger, and the value of the peak value approaches to 0. 5 with the distance from the peak point. The contact compressive stress of different morphology has great difference in shear stress, and the contact compressive stress of the same morphology is similar to the shear stress law and the position of peak value is close. Contact compressive stress, shear stress at the peak point of its value is larger, with far away from the peak point of its value approaching to 0. The number of peak points of the stress curve decreases gradually during the whole shear process. The ratio of shear stress to contact compressive stress in the same shear test is the friction coefficient. The change of opening distance is that the curve rises sharply to the peak point, then decreases, and finally approaches the level. The contact area curves of different JRC joints are basically the same, and the contact area and shear displacement can be fitted to y=axb curves.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45
本文编号：2184746
[Abstract]:Joint plane is usually the weak plane of rock mass. In practical engineering, the failure of rock mass is mostly caused by joint, and the geometry of joint surface is an important factor to control rock mechanics. Based on this, the evolution of the shape and stress of joints with regular shape and random shape in shear process is studied in this paper. The main results are as follows: (1) the morphologies of sawtooth joints during shearing: the variation law of the high RMS and the RMS of slope is: the initial stage is relatively flat, then the cliff-like decline, and the final approach is stable; The autocorrelation function curve is almost constant. (2) the stress evolution of sawtooth joints in shear process: the tensile stress curves near the joints show undulating wave shape, and most of the peak points are about 0.5 蟽 ng. The compressive stress curve near the joint surface is rectangular pulse shape, and the lower limit of the curve is about -2.5 蟽 n. The contact compressive stress curve shows a rectangular pulse shape, and the curve is approximately oscillatory with the same period and constant amplitude, and the fluctuation range is (0.22 ~ (1.5) A 蟽 ~ (n). The shear stress curve is rectangular pulse shape, the fluctuation range of the curve is f. (0.2n. 5) 蟽. N. The contribution of the shape change to the shear stress is 0.2 蟽 n f, and the ratio of shear stress to contact compressive stress is friction coefficient. The ratio of the minimum contact area to the total contact area of the joint plane is 26.7. The opening distance of joint surface is periodic. (3) the morphology of JRC curve joints changes: the height of RMS root of morphology, the root of slope RMS, the autocorrelation function decrease gradually. (4) the stress evolution of the joint surface of the JRC curve during shear process: the tensile stress in the region near the joint plane with different morphologies varies greatly, the compressive stress in the area near the same joint surface is similar to the tensile stress law, and the stress evolution of the joint plane is similar to that of the tensile stress in the region near the same surface. The position of the peak value is close, the value of the peak point is larger, and the value of the peak value approaches to 0. 5 with the distance from the peak point. The contact compressive stress of different morphology has great difference in shear stress, and the contact compressive stress of the same morphology is similar to the shear stress law and the position of peak value is close. Contact compressive stress, shear stress at the peak point of its value is larger, with far away from the peak point of its value approaching to 0. The number of peak points of the stress curve decreases gradually during the whole shear process. The ratio of shear stress to contact compressive stress in the same shear test is the friction coefficient. The change of opening distance is that the curve rises sharply to the peak point, then decreases, and finally approaches the level. The contact area curves of different JRC joints are basically the same, and the contact area and shear displacement can be fitted to y=axb curves.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45
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