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- A safety supervisory control of building dyke, i. e., pore pressure coefficient B-bar control method is introduced. 摘要简要介绍了一种软基上填筑堤坝施工安全的监控方法-孔压系数B值控制法。
- Generally, the wells of northeast region of Sichuan have high pore pressure, the pressure coefficient of whose main gas pay is mostly above 1.5, but Maoba 1 well and Heba 1 well’s reach 2.0. 川东北地区的井一般压力都比较高,主要气层压力系数大多在1.;5以上,毛坝1井、河坝1井等井压力系数达到2
- pore pressure coefficient 孔隙压力系数
- By analyzing the results of the test the authors obtain a experiential curve about the coefficient of seepage, volumetric stress and pore pressure. 并经过分析可知,若其埋藏深度较浅,可以通过增加孔隙压来改善它的渗透性;
- When the pore pressure is relatively high,the formate is used as a weighting agent to maintain a low-solid mud system. 在地层孔隙压力较高时,则配合使用甲酸盐进行加重,以维持一种性能优良的低固相钻井液体系。
- Benefit of this modified shape is that the expansion around the first corner reduces the initial pressure coefficient on the frustum to low values. 这个改进的外型的优点是绕第一角点的膨胀会把截锥上的初始压力系数减少到很低的值。
- Besides, the undrained shear strength was increased slightly due to the negative pore pressure. 不排水条件下由于负孔隙水压力的存在,土样的表观强度略有增大。
- In the meantime, the pore pressure also increased with the increase of confining pressure. 同时,孔隙水压力值也随着周围压力的增大而明显增大。
- During the second stage, the excess pore pressure was dissipated under the constant loads. 固结阶段,土体在恒定荷载作用下,超孔隙气压和超孔隙水压逐渐消散而固结。
- Measuring the moisture diffusion coefficient and floating pressure coefficient by the means of diffusible cup. 对试验数据回归分析表明:木材水分扩散系数随试材厚度的增加而呈指数增加;
- The model can be used to determine formation pore pressure and the optimum drilling fluid density to stabilize borehole. 利用该模型可确定地层孔隙压力和保持井眼稳定的最优钻井液密度等参数。
- The residual strain is the additional shear strain created with the increase of pore pressure due to cyclic shear under initial shear stress. 残余应变是由于周期剪切引起孔隙压力增长;在初始剪力作用下产生的附加的剪应变.
- The amplitudes of pore pressure increased notably with the increase of cyclic stress ratio, and the residual pore pressure also increased obviously. 当循环应力比增大时,动孔隙水压力变化幅值显著增加,而残余孔压也较大。
- The composites displayed a positive pressure coefficient(PPC) effect at ww__c.Uniaxial compression might facilitate the NPC effect or weaken the PPC e... 而高于渗流阈值时;呈现NPC效应.;在渗流阈值附近;单轴压缩可诱导NPC效应的出现;或者抑制PPC效应
- Formation drillability is related to formation compact degree and pore fracture degree,so NDR can reflect formation pore pressure state. 地层可钻性与地层的压实程度和孔隙破裂程度有关,因此NDR可以反映地层孔隙压力的情况。
- As the pressure coefficient increases, the volume ratio of the working gas vs. the cushion gas increases rapidly and the efficiency of gas storages increases too. 同时随著增压系数的增大,工作气与气垫气的体积比迅速增加,气库效率随之提高。
- The degradation of undrained shear strength is related to the cyclic strain and accumulated pore pressure produced by undrained clyclic loading. 并将波浪荷载作用使土样内孔压升高,有效应力降低,形成拟超固结现象的理论,应用到土样不排水抗剪强度衰减与平均累积孔压之间关系的分析;
- According to the isoline of the pressure coefficient that is 1.42, the distribution of source-contacting gas accumulations can be determined approximately. 根据这一界限,大致可以确定根缘气的发育范围。
- The study results show that the pore pressure and axial strain took on a fluctuant increasing process under cyclic shear loading. 研究表明,在循环荷载作用下,孔隙水压力和轴向应变均是一个波动上升的过程。
- When the pore pressure is relatively low,the positive-charged polyglycol is mainly used to ensure the muds having good performance. 在地层孔隙压力较低时,主要使用正电聚醇处理剂确保钻井液具有良好的性能;