基于单个钻孔孔壁电视图像确定地下岩体结构面产状的普适数学方法

发布时间：2018-08-03 08:46

【摘要】：岩体结构面产状是影响岩体力学性质及工程稳定性的重要地质因素.从钻孔孔壁电视平展图上可较精确地提取结构面迹线上不共线三点的相对二维坐标(d,h),再利用空间解析几何理论确定其三维空间相对坐标(x,y,z),并求得结构面法向矢量.根据钻孔孔壁与坡面及结构面产状的空间几何关系,在保持原点不变的情况下,采用空间坐标变换的方法,将三维坐标系z轴和y轴分别转化为竖直方向z′和正北地理方向y′,并确定转化后坐标系空间的结构面法向矢量.再从结构面产状的定义出发,根据结构面法向矢量与结构面倾向、倾角的相关性,建立了一个空间几何模型,通过该模型可求得任意平直坡面上任一钻孔内局部岩体结构面的产状.
[Abstract]:The occurrence of rock structural plane is an important geological factor affecting the mechanical properties and engineering stability of rock mass. The relative two-dimensional coordinates (dh) of non-collinear three points on the track line of the structural plane can be extracted more accurately from the TV flat map of the borehole wall, and then the three-dimensional relative coordinates (XJ) are determined by using the spatial analytic geometry theory, and the normal vector of the structural plane is obtained. According to the spatial geometric relationship between the borehole wall and the occurrence of slope and structural surface, the method of spatial coordinate transformation is used to keep the origin unchanged. The z axis and y axis of the three dimensional coordinate system are transformed into the vertical direction z' and the northward geographical direction respectively, and the normal vector of the structural plane of the transformed coordinate system space is determined. Based on the definition of the occurrence of the structural plane and the correlation between the normal vector of the structural plane and the orientation of the structural plane and the inclination angle, a spatial geometric model is established. By using this model, the occurrence of local rock mass structural planes in a borehole on an arbitrary straight slope can be obtained.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学土木工程学院;
【基金】：国家自然科学基金面上项目(Nos.41172243,41472245) 重庆市国土房管科技计划项目(No.CQGT-KJ-2014049)
【分类号】：TU45

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