本文介绍了岩石压剪断裂试件切口端部微裂区的研究成果。
This paper presents a result of researching the microcracking zone near the notch tip of rock specimen in compression shear fracture.
结果表明：裂尖的几何形状对微裂纹圆柱化时间起决定性作用；
The results show that the cylinderization time depends sensitively on the initial morphology of the microcrack tip.
最后，建立水力压裂岩体基质孔隙和微裂缝渗透张量演化模型。
Finally, the model of matrix porosity and the evolution of permeability tensor of Microfracture for hydraulic fracturing rock is established.
解理的临界事件是由启裂的第二相尺寸的微裂纹向周围基体的扩展。
The critical event of cleavage is the propagation of a second phase particle-sized microcrack into the neighboring matrix.
在上述结果基础上，提出了描述该微裂区的岩石压剪断裂核的形状方程。
Finally, this paper gives a shape equation of rock compression shear fracture nucleus describing the microcracking zone.
水力压裂后，当微裂缝闭合时初始损伤带的诱导应力导致围岩应力重新分布。
The induced stress of initial damage zone results in the redistribution of surrounding rock stress when the micro-crack closes after hydraulic fracture.
通过评价实验，考察了压裂液冻胶在低渗透气藏微裂缝储层中的降滤失性能。
The fluid loss reducing capacity of the gel was investigated in the microcrack reservoirs of the low permeability gas reservoir through evaluation tests.
同时现有抗裂砂浆的抗裂性仍然较差，在应力作用下会出现数量较多的微裂缝。
Meanwhile, the crack resistance of present crack-resistance mortar is still a poor, a certain amount micro-cracks are produced under stress.
对于裂缝性低渗透储层，由于其基质孔隙度小、渗透率低，天然微裂隙成为决定压裂液滤失的主要因素。
Micro fissure is a significant factor for determining the fluid loss in low-permeability fractured reservoir, due to its small porosity and low permeability in the matrix.
根据表面扩散控制下物质迁移规律，建立有限单元法，对裂面形貌扰动下二维微裂纹演变过程进行数值模拟。
Based on the theory of surface diffusion, a finite element method was developed to simulate shape evolutions of two-dimensional microcracks with surface perturbation.
根据最大拉应力理论，认为一旦混凝土的最大主应力大于混凝土材料的抗拉强度，就被视为混凝土开裂的微裂区域。
The concrete was considered as crack progressing once the maximal principle of stress in the concrete reached the ultimate stress of concrete according to the theory of maximal tension stress.
通过室内研究和现场试验，采用“悬塞”控缝、高砂比小陶粒控缝等配套技术，有效地控制了微裂缝在压裂过程中的影响，提高了压裂成功率。
After office study and field experiment, using suspend plug and high sand concentration with little ceramsite to control fracture, advanced fracturing success ratio.
以混凝土单轴拉压损伤为基础，给出了单元弹性损伤本构关系，分析了裂纹尖端损伤微裂区尺寸，定义了有效应力强度因子，给出了I型裂纹损伤断裂判据。
Mesoscopic damage size on the top of crack is analysed, the effective stress strength factor is defined, the mode I crack damage fracture criteria is presented.
应用裂纹顶端应力场的精确解，详细讨论了混凝土裂纹顶端的微裂区，并将其与局部解所得的结果进行了比较；进而研究了因应力松驰引起的微裂区的改变。
The microcrack zone concrete is deeply analyzed by using the exact solution of crack tip stress field and is compared to the result from the local solution.
结果表明，焊缝金属中存在的非金属夹杂物，在低应力作用下形成微裂纹成为裂源，加之焊缝组织中存在大量的MA结构群，从而发生焊缝金属在室温下的解理断裂。
The results showed that nonmetallic inclusions in weld seam served as crack initiation site under external bend load, and large amount of m a structure resulted in cleavage fracture of weld seam.
目的：探讨经侧裂岛叶入路微侵袭手术对高血压性壳核出血患者的治疗价值。
Objective:To investigate the therapeutic value of the minimally invasive surgical treatment of hypertensive putamianal hematomas via transsylvian transinsular approach.
目的探讨经小脑延髓裂入路微创手术切除脑桥背侧病变的疗效。
Objective To observe the trans- cerebellomedullary fissure minimally invasive operation treating lesions of dorsal part of pons.
目的总结老年人额叶脑挫裂伤行微创手术治疗的经验。
Objective To summarize the experience of minimally invasive surgical therapy of frontal lobe contusion in old people.
经皮或应用旁正中小切口技术完成的微创脊柱椎弓根螺钉内固定术的原理是保留多裂肌功能。
The rationale for minimally invasive pedicle screw insertion into the spine, which can be performed percutaneously or via a paramedian mini-open technique, is to preserve multifidus muscle function.
数值模拟再现了水压致裂过程中岩石由细观微破裂到宏观破坏的演化过程，并且与试验结果表现出了较好的一致性。
The simulation results reflect macroscopic failure evolution process induced by microscopic fracture subjected to hydraulic loading, which agrees well with the experimental results.
数值模拟再现了水压致裂过程中岩石由细观微破裂到宏观破坏的演化过程，并且与试验结果表现出了较好的一致性。
The simulation results reflect macroscopic failure evolution process induced by microscopic fracture subjected to hydraulic loading, which agrees well with the experimental results.
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