DDARF全长锚固岩体等效参数研究及其应用  

Study and Application of the Equivalent Parameters of Full-Length Anchored Rock Masses in DDARF

作　　者：陈云娟[1,2] 朱维申[2] 王知深[2] 王文[3] 

机构地区：[1]山东建筑大学建筑结构鉴定加固与改造山东省重点实验室,济南250101 [2]山东大学岩土与结构工程研究中心,济南250061 [3]山东城市建设职业学院.济南250103

出　　处：《现代隧道技术》2015年第5期61-66,共6页Modern Tunnelling Technology

基　　金：国家自然科学基金(51278287);教育部博士点基金(No.20110131110030);教育部创新团队发展计划(IRT13075)

摘　　要：非连续变形分析DDARF中锚杆为端锚形式,全长锚杆的研究目前处于初步阶段。为此从锚固效应的角度出发,考虑全长锚杆引起的加锚岩体力学参数的改变,从而实现DDARF中全长锚杆的锚固效应分析。文章以沂蒙抽水蓄能电站为工程背景,利用FLAC进行了毛洞、加锚岩体力学参数提高、全长锚杆支护三种工况下洞室围岩塑性区分析;利用DDARF进行了该三种工况下洞室围岩裂隙扩展分析。结果表明:FLAC分析中,参数提高和全长锚杆支护两种工况下围岩塑性区均比毛洞时显著减少,其中粘聚力提高1.18倍和全长锚杆支护两种工况吻合度较高,验证了所引用公式的合理性;DDARF分析中,参数提高和全长锚杆支护两种工况下,洞室围岩裂隙扩展规模和数量基本一致,较毛洞相比均得到了有效控制。采用锚固岩体等效参数提高来模拟DDARF全长锚杆的锚固效应,不仅大大减少了锚杆的计算工作量,而且具有较高的准确度,为DDARF中全长锚杆的锚固效应分析提供了新的思路。In the discontinuous deformation analysis of rock failure （DDARF）, it is assumed that the rock mass is reinforced by end-anchored bolts. The study of the rock masses reinforced by full-length anchored bolts is still in its early stages. In light of the equivalent anchoring effect, and considering the variation of mechanical parameters of the rock mass supported by full-length anchored bolts, a method was proposed to perform an anchoring-effect analysis of full-length anchored bolts in DDARF. Based on construction of the Yimeng power station project, and using FLAC software, this paper analyzed the plastic zone of surrounding rocks under three conditions of excavation： no support; support with improved equivalent mechanic parameters; and rock mass support with full-length anchored bolts. Furthermore, the crack development of the rock masses was analyzed by DDARF. The results show that： 1） in FLAC analysis, fewer plastic zones occurred in surrounding rocks under conditions of support with improved equivalent mechanic parameters and those reinforced with full-length anchored bolts compared with excavation with no support, and the calculation results under the conditions of 1.18 times cohesive force and full- length anchoring are matched especially well; and 2） in DDARF analysis, the cracks in the surrounding rocks using anchors with improved mechanic parameters and full-length anchoring are controlled more effectively compared to those in rock masses with no support, with roughly the same development scale and number of cracks. Thus, using the improved equivalent mechanic parameters for anchored rock masses to simulate the full-length anchoring effect in DDARF can not only reduce the complexity of the calculation but also improve its accuracy.

关 键 词：DDARF 全长锚固锚杆 等效参数 抽水蓄能电站 裂隙扩展 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]