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钻孔围岩中存在裂隙是导致钻孔应力–应变观测中测试值不满足自洽关系的原因之一,但缺乏理论依据。建立若干个二维有限元模型,通过模拟计算相邻45°的各元件位移,定性地研究裂隙与最大水平应力的角度、最大水平应力与最小水平应力比值、裂隙与孔壁距离、长度、宽度和材料属性几种典型要素对四分量钻孔应力–应变观测的影响。结果显示,几种因素对钻孔应力–应变观测都有比较明显的影响,当裂隙延展方向与最小水平应力方向一致或最大水平应力与最小水平应力比值越大、裂隙与孔壁距离越近、裂隙尺寸越大、裂隙的材料属性与围岩的差距越大时,裂隙的存在对观测的影响越明显。
The existence of fissures in the surrounding rock of a borehole is one of the reasons that the test values in the borehole stress-strain observation do not satisfy the self-consistent relationship, but there is no theoretical basis. Several two-dimensional finite element models are established. By simulating the displacements of adjacent 45 ° elements, the angle between the fracture and the maximum horizontal stress, the ratio between the maximum horizontal stress and the minimum horizontal stress, the distance between the fracture and the hole wall, the length and the width Influence of Some Typical Factors of Material Properties on Stress - Strain Observation of Four Component Drilling. The results show that several factors have obvious influence on the stress-strain observation of drilling. When the direction of crack propagation coincides with the direction of the minimum horizontal stress or the ratio of the maximum horizontal stress to the minimum horizontal stress is larger, The larger the fissure size is, the larger the difference between the material properties of the fissure and the surrounding rock is, and the more obvious the influence of the fissure is on the observation.