CAJ | 학술논문

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.
비련속변형분석DDARF중묘간위단묘형식,전장묘간적연구목전처우초보계단. 위차종묘고효응적각도출발,고필전장묘간인기적가묘암체역학삼수적개변,종이실현DDARF중전장묘간적묘고효응분석.문장이기몽추수축능전참위공정배경,이용FLAC진행료모동、가묘암체역학삼수제고、전장묘간지호삼충공황하동실위암소성구분석;이용DDARF진행료해삼충공황하동실위암렬극확전분석.결과표명:FLAC분석중,삼수제고화전장묘간지호량충공황하위암소성구균비모동시현저감소,기중점취력제고1.18배화전장묘간지호량충공황문합도교고,험증료소인용공식적합이성;DDARF분석중,삼수제고화전장묘간지호량충공황하,동실위암렬극확전규모화수량기본일치,교모동상비균득도료유효공제.채용묘고암체등효삼수제고래모의DDARF전장묘간적묘고효응,불부대대감소료묘간적계산공작량,이차구유교고적준학도,위DDARF중전장묘간적묘고효응분석제공료신적사로.
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.