三峡坝区非对称共轭低缓角度剪破裂系

ASYMMETRIC AND CONJUGATE LOW-ANGLE SHEAR FRACTURE SYSTEM IN THREE GORGES DAM REGION, CHINA

在岩石摩擦流变学理论指导下 ,运用构造解析方法 ,在三峡坝区岩体内多期的、复杂的破裂系统中 ,识别出一个不对称的共轭低缓角度剪破裂系统 .几何学和运动学标志证明 ,这个影响大坝深层和浅层抗滑稳定性的共轭剪切破裂系统形成较早 ,受岩体非均一性制约 ,被后期破裂系统切错和改造 ,是高流体压力控制下非对称共轴变形的结果 .

An asymmetric and conjugate low_angle shear fracture system is identified in the multi_phase complex fracture systems within the rock mass of the Three Gorges dam region, with the help of the rock frictional rheology theory and the structural analytical method. The geometry and kinetic indicators show that this conjugate shear fracture system affected by the sliding_resistance stability in the deep and shallow layers of the dam occurred at a relatively early age, and then was sheared and modified by the fracture systems in the later period, constrained by the heterogeneity of the rock mass. In this sense, this conjugate shear fracture system is a product of the asymmetrical coaxial deformation restrained by the high fluid pressure.