Development of a Computing Code Accurate Prediction of Output and Life of Hot Dry Rock Power Generation

准确预测干热岩发电出力和寿命计算代码的开发

• 批准号: 09651029
• 负责人: MIZUTA Yoshiaki
• 金额: $ 2.3万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09651029/
• 关键词: Fictitious Stress Method; Analytical Integration; Division into elements; Displacement Discontinuity Method; Crack Tip Element; Non-Steady Heat Conduction; Flow in Fracture; Heat Extraction; 変位くい違い法; 境界要素法; TIME INTEGRAL法; フラクチャー; 数値積分; 初期温度分

The investigators almost have completed main frame of the computing system for accurate prediction of output and life of Hot Dry Rock power generation. The computing system combine the sub-systems which are to analyze : (1) non-steady heat conduction in the infinite medium under thermal boundary condition and thermal elasticity induced by temperature gradient, (2) aperture distribution of the fracture created by hydrofracturing and deformation of rock around the fracture under mechanical boundary condition, (3) stress intensity factor at fracture tip and fracture extension due to aperture expansion induced by interaction of rock stress, fluid pressure in the fracture and thermal elasticity, and (4) velocity distribution of non-steady fluid flow in the fracture and heat transfer from rock to fluid flow.They already completed the sub-systems, (1)〜(3) and the fruits with respect to (1) and (2) were already reported in the journals. The results of (3) will be reported at two international congress held in 2000. A part of (4), that is, development of the sub-system to calculate heat transfer is not completed but the basis of it will soon be completed.The research results obtained in FY 1999 are as follows :1) In the past, division of the boundary into elements such that the center of gravity of some element lay on the prolongations of three sides of any other triangular element, was not permitted. In the procedure developed in this study, strict analytical integration for such case can be done. Furthermore, the expressions of analytical integrals become simple and so, computation can be fast and accurate.2) Strict analytical integration for crack-tip element whose displacement discontinuity distribution is square root shape, was put into operation and so, precise calculation of stress intensity factor at fracture tip can be done.

研究人员已基本完成了热干岩发电发电量和寿命准确预测计算系统的总体框架。该计算系统结合了以下几个子系统：(1)热边界条件下无限大介质中的非稳态热传导和温度梯度引起的热弹性；(2)力学边界条件下水力压裂产生的裂缝的孔径分布和裂缝周围岩石的变形；(3)岩石应力、裂缝内流体压力和热弹性相互作用引起的裂缝尖端应力强度因子和裂缝延伸；(4)裂缝中非稳态流体流动的速度分布和岩石到流体的热传递。他们已经完成了这些子系统的开发。(1)~(3)及与(1)和(2)有关的结果已在期刊上报道。(3)的结果将在2000年举行的两次国际会议上报告。(4)的一部分，即计算传热的子系统的开发尚未完成，但其基础即将完成。1999财年的研究结果如下：1)过去不允许将边界划分为单元，使某个单元的重心位于任何其他三角形单元的三条边的延长线上。在本研究开发的程序中，可以对这种情况进行严格的分析积分。2)对位移不连续分布为平方根的裂纹尖端单元进行严格的解析积分，从而可以精确计算出裂纹尖端的应力强度因子。

项目成果

H, Li, C, Liu, MIZUTA, Y, M. A. Kayupov MIZUTA, Y: "Crack Edge Element and its Analytical Integration for Three- dimensional Displacement Discontinuity Method with Boundary Division"Proc. 4th North American Rock Mechanics Symp.(Seattle). (2000)

H，Li，C，Liu，MIZUTA，Y，M.A. Kayupov MIZUTA，Y：“边界分割三维位移不连续方法的裂纹边缘元及其解析积分”Proc。

Y.Mizuta et al: "Studies in relation to Hydraulic Fracturing Experiments Carried out in Kamioka Mine"Geothermal Science and Technology. Vol.6. 281-297 (1999)

Y.Mizuta等：“神冈矿山水力压裂实验相关研究”地热科学与技术。

Y Mizuta et al: "Studies in relation to Hydraulic Fracturing Experiments Carried out in Kamioka Mine"Geothermal Science and Technology. Vol.6. 281-297 (1999)

Y Mizuta 等：“在神冈矿山进行的水力压裂实验相关研究”地热科学与技术。

B.Sulistianto,Y. Mizuta: "Stress Distribution in the Vicinity of Righlt Strike-Slip Fault,a Numerical Approach"Shigen to Sozai. Vol.115 No.9. 651-659 (1999)

B.苏利斯蒂安托，Y.

劉承論、栗山憲、水田義明: "フラクチャーを有する媒体内の境界要素法による三次元熱伝導解析" 資源と素材. 115・2. 73-76 (1999)

Chengron Liu、Ken Kuriyama、Yoshiaki Mizuta：“在有裂缝的介质中使用边界元法进行三维热传导分析”资源和材料 115・2（1999）。