权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Three-dimensional Boundary Element Program for Advanced Designs in Rock Engineeirng and Its Application to Actual Problems.

岩石工程先进设计三维边界元程序的开发及其在实际问题中的应用。

基本信息

批准号：
06452359
负责人：
MIZUTA Yoshiaki
金额：
$ 3.39万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

Before this research takes effect, Kuriyama and Mizuta has developed a numerical code for three dimensional elastic analysis by the Displacement Discontinuity Method and studied the applicability of it. This 3D-DDM analysis has a distinctive feature that it is effective in modeling of discontinuous plane such as fault/crack which is not easy to be modeled by the other methods, but it is disadvantageous in modeling of free surface of rock. Hence, we developed the numerical code for three dimensional elastic analysis by the Fictitious Stress Method, which is usually used in modeling of the surface of the earth or surface plane of underground opening, by an unique procedure. In this procedure, as numerical integration is not used and analytical integration is used in calculation of influence coefficients among the triangular leaf elements which construct the boundary plane, accurate solutions can be obtained and its computation speed is relatively high.This computation code was combined w … More ith the 3D-DDM code and the computation code for transient analysis of fluid flow in the fracture.On the other hand, we carried out an in-situ hydraulic fracturing experiment assisted by abrasive water jet borehole slotting in the Mozumi Mine of Kamioka Mining and Smelting Co.Ltd.in Gifu Prefecture by different Grant-in Aid. We carried out the tests of fluid injection into the fracture which was produced by hydrofracturing and measured the variations of fluid pressure distribution and surface displacement of the side wall of the drift, which was caused by opening of the fracture. Therefore, simulations of the fluid injection tests were carried out by using the computing system mentioned above and it was confirmed that the computed results with the measured results.A numerical code for three dimensional non-steady heat conduction by the Boundary Element Method was developed. In this program, influence coefficients are obtained through the numerical integration taking the scheme newly developed by us into consideration because the basic formula dealt in the problem can not be integrated analytically and some singularity happens even in the popular method for numerical integration. However, in case of heat conduction analysis, accuracy is sufficient even by numerical integration if the special method is introduced and it was confirmed by comparison of a computed result with the corresponding strict solution. Finally, the program was combined into the combined DDM-FSM-FEM analysis in order to take rock expansion/shrinkage due to hear movement and heat transfer from rock to fluid into consideration. Less

在这项研究生效之前，Kuriyama和Mizuta已经开发了一种通过位移不连续法进行三维弹性分析的数值代码，并研究了它的适用性。这种3D-DDM分析的一个显着特点是它对于断层/裂缝等不连续面的建模是有效的，而其他方法不易建模，但它在岩石自由表面的建模方面是不利的。因此，我们通过独特的程序开发了虚拟应力法三维弹性分析的数值代码，该方法通常用于地球表面或地下开口表面平面的建模。本程序中，由于没有采用数值积分，而采用解析积分来计算构成边界面的三角形叶单元之间的影响系数，因此能够得到准确的解，且计算速度较高。该计算代码与3D-DDM代码和裂缝中流体流动瞬态分析计算代码相结合。另一方面，我们进行了原位计算不同补助资金在岐阜县神冈矿业冶炼株式会社莫住矿山进行磨料水射流钻孔开槽辅助水力压裂试验。对水力压裂产生的裂缝进行注液试验，测量裂缝张开引起的流体压力分布和巷道侧壁表面位移的变化。因此，利用上述计算系统对注液试验进行了模拟，并验证了计算结果与实测结果的吻合。开发了边界元法三维非稳态热传导数值计算程序。在这个程序中，影响系数是通过数值积分得到的，考虑了我们新开发的方案，因为问题处理的基本公式不能解析积分，而且即使在流行的数值积分方法中也会出现奇异性。然而，在热传导分析的情况下，如果引入特殊方法并通过计算结果与相应的严格解的比较来确认，即使通过数值积分精度也足够了。最后，该程序被合并到 DDM-FSM-FEM 组合分析中，以便考虑由于热运动和从岩石到流体的热传递而引起的岩石膨胀/收缩。较少的