Thus, the results provide a basis for thickness determination of flat frozen soil wall with a large creep deformation. 从而为蠕变变形较大的平面冻土墙的厚度确定提供了依据。
In order to determine the thickness of flat frozen soil wall with evident rheological properties, the triaxial creep properties of frozen soil are analyzed. 主要是对冻土的三轴蠕变特性进行分析研究,从而进一步确定具有明显流变特性的平面冻土墙的厚度。
Early-age stress analysis of concrete diaphragm wall through tensile and compressive creep modeling 考虑拉伸与压缩不同徐变特征的混凝土连续墙早龄内应力分析
The authors point out that the plastic zone in the wall rock is unavoidable because of very low strength of tuff. The creep of fracture rock in plastic zone and fatigue of rock at elastic-plastic boundary are the main reasons for time-dependent deformation of the rock. 指出在地应力作用下,围岩产生塑性区是不可避免的,塑性区内破碎岩石的蠕变及弹塑边界处岩石的静态疲劳是围岩变形随时间增大的主要原因。
Experimental Investigation over Reinforced Expansive Soils Retaining Wall Creep 加筋膨胀土挡墙蠕变试验研究
If the basement wall is thin, the creep stress is small and tensile stress appears early; 地下室侧墙墙体越薄,徐变温度应力越小,拉应力出现时间越早;
Because the limite on axial compression ratio of column and wall are different, the axial deformation of them must be different in tall-building construction. When consider the creep and shrinkage of concrete, with the level number increasing, the difference of axial deformation will be enlarging. 在高层建筑结构中,由于轴压比限值不同,柱和剪力墙的轴向变形值必然产生差异,加上混凝土收缩徐变的影响,随着结构层数的增加,其轴向变形差会逐渐增大。
Based on the cause of cracking, the influence of the thickness of the wall, length, bar arrangement, mix proportion, expanding agent, etc, on the wall stress due to concrete creep and temperature change is analyzed. 从裂缝形成的原因出发,分析了地下室侧墙厚度、长度、配筋率、配合比、膨胀剂等因素对墙体徐变温度应力的影响。
The temperature rise at the center of a massive concrete wall is calculated by using the adiabatic rise of temperature and heat conduction equations of concrete based on the equivalent time, and considering effects of temperature on the hydration heat reaction ratio and creep characteristics of early-age concrete. 基于等效时间的混凝土绝热温升、热传导方程,考虑温度对早期混凝土水化热化学反应速率和徐变特性的影响,计算了大体积混凝土墙中心的温升。
The application of finite element numerical simulation of excavation of deep foundation pit conserved by frozen soil wall is discussed, creep model and parameter of frozen soil wall is given. 讨论了有限元数值法在冻土墙围护深基坑开挖中的应用,给出了适合于冻土墙的流变模型,并进行了参数识别。
The calculating results verified that the crack was supposed to occur in the out wall of tube, and the tube failure was mainly caused by carburization ( creep failure generally occurred in the inner wall). 计算结果显示,炉管的开裂发生在炉管外壁,且主要是渗碳导致的炉管失效(蠕变失效主要发生在内壁)。
The change rule of the basement wall creep thermal stress has close connection with the modulus of elasticity and creep characteristics. If the modulus of elasticity changes slowly and early stage creep slack is large, the tensile stress will be small; 地下室侧墙徐变温度应力的变化规律同混凝土的弹性模量及徐变特性有密切的关系,采用弹性模量变化较缓,早期徐变度较大的混凝土有助于减小拉应力;
The Larson-Miller method and the superheater wall temperature computation model brought forward by Soviet criterion are adopted to calculate the life loss caused by creep. 本文采用拉森-米勒参数法,结合前苏联1973年热力计算标准中的过热器壁温计算模型,对前期蠕变寿命损耗进行了计算;
We can come to the conclusion from the tests that the change of water content plays a large role in reinforced expansive soils retaining wall creep under a low proportion of limited load, and even load does the same under a high proportion of limited load. 在较低的极限荷载比例下,膨胀土体中含水量的变化对蠕变起主要作用,在较高的极限荷载比例下,加筋膨胀土的恒载对蠕变起主要作用。
The study also discusses nonlinear procedure analysis on environmental temperature effect of the wall, and presents a simplified method to calculate stress loss due to creep, which on basis of stress relaxation theory. 本文还对墙体环境温度效应的非线性过程分析进行探讨,提出了基于应力松弛理论的徐变应力简化计算方法。
The deformation of frozen wall is composed of rotational, elastic and bigger creep deformations, and it nonlinearly increases with the ground pressure and nonlinearly decreases with wall thickness. 冻土墙变形由转动变形、弹性变形及较大的蠕变变形组成;墙体变形随其厚度增大呈非线性减小,而随土压力增大呈非线性增大;
Characteristics of reinforced expansive soils retaining wall creep are studied by simulation experiments, considering the influences of water content on the engineering characteristics of expansive soils. 通过模拟试验研究了加筋膨胀土挡墙的蠕变特性,考虑了含水量对膨胀土的特殊作用。
Soft rock wall of tunnels in deep mining will have large creep deformation when the stress in rock is near its ultimate strength. 在深井软岩条件下,巷道围岩应力状态处于岩石强度极限邻域内,围岩会产生较大的蠕变变形。
On the other hand, by on-site data monitoring, continuous retaining wall of the slide is better than single micro-pile, also obvious creep deformation in a very short period of time became stabilize. 另一方面通过现场数据监测,连续抗滑挡墙的抗滑效果较单根微型桩明显,蠕动变形在很短的时间内趋于稳定。
At the same time, the diaphragm wall has certain inhibitory effect for soil creep, where it could improve the foundation capacity and ensure the safe of embankment filling and operation. 同时地下连续墙对土体蠕变有一定的抑制作用,因而能够提高地基承载力,保证路堤填筑与公路运营的安全。