强度折减法在Hoek-Brown准则中的应用.PDFVIP

第 卷第 期 中南大学学报 自然科学版 38 6 ( ) Vol.38 No.6 2007 年 12 月 J. Cent. South Univ. (Science and Technology) Dec. 2007 强度折减法在 Hoek-Brown准则中的应用 林 杭，曹 平，赵延林，李江腾 (中南大学 资源与安全工程学院，湖南 长沙，410083) 摘 要：为了在 Hoek-Brown 准则中实施强度折减法，并使其得到的结果与 Mohr-Coulomb 准则中强度折减法得 到的结果等效，首先，通过理论推导确定Ｈoek-Brown 准则参数 m，s，σci 与粘结力 c 和内摩擦角φ之间的关系； 然后，进一步得到在 Hoek-Brown 准则中实施强度折减法时，m，s 和 σci 的折减系数以及它们之间的关系；最后， 由 FLAC3D 软件建立计算模型，采用所确定的折减方法计算边坡的安全系数，并将该结果与 Mohr-Coulomb 准则 得到的结果进行对比，结果表明：参数 m，s 和 σci 的折减系数须满足一定关系，强度折减法在 Hoek-Brown 准则 和 Mohr-Coulomb 准则中得到的安全系数的差别为 3.54%，差别微小，从而验证了所确定的折减方法的可靠性。 关键词：Hoek-Brown 准则；Mohr-Coulomb 准则；等效；强度折减法；FLAC3D软件 中图分类号：TU353.6 文献标识码：A 文章编号：1672-7207(2007)06−1219−06 Application of strength reduction method in Hoek-Brown criterion LIN Hang, CAO Ping, ZHAO Yan-lin, LI Jiang-teng (School of Resources and Safety Engineering, Central South University, Changsha 410083, China) Abstract: In order to implement the strength reduction method in the Hoek-Brown criterion, and make the result obtained by Hoek-Brown criterion equivalent to that by Mohr-Coulomb criterion, some deductions and numerical calculations were done. Firstly, the relationships among Hoek-Brown parameters m, s, σci and cohesion c, internal friction angle φ were established by theory deduction. Secondly, the reduction factors of m, s, σci were obtained by further theory deduction and their relationships among these factors were found. At last the calculation models were obtained by FLAC3D software. In the calculation procedure for safety factor of slope, the proposed reduction method was adopted. The comparative analysis was done for the safety factors obtained by Hoek-Brown and Mohr-Coulomb criterion. The result shows that, three reduction factors for m, s and σci should satisfy certain relationship, the difference between the two safety factors is 3.54%, which is very small, which pr