CAJ | 학술논문

以相似理论为基础，采用砂土模拟围岩，铁丝模拟锚杆。实测隧道开挖过程中，不同洞周支护力、不同锚杆长度以及锚杆与洞周支护力共同作用下围岩应力分布、稳定性及分区的变化规律。采用有限元模拟不同锚杆长度下围岩的应力分布规律，并基于D-P屈服准则得出围岩塑性区的范围。研究结果表明，采用锚杆与洞周支护力联合支护，更能充分发挥围岩自身的承载能力。锚杆的支护长度应不小于无支护时的松动区外包半径大小。松散围岩条件下，锚杆的长度不宜小于隧洞跨度的1/5，综合支护时洞周支护力大小宜为原岩垂直应力的5%左右。对比试验与有限元模拟结果，有限元模拟所得结果相比于试验较为保守。
이상사이론위기출，채용사토모의위암，철사모의묘간。실측수도개알과정중，불동동주지호력、불동묘간장도이급묘간여동주지호력공동작용하위암응력분포、은정성급분구적변화규률。채용유한원모의불동묘간장도하위암적응력분포규률，병기우D-P굴복준칙득출위암소성구적범위。연구결과표명，채용묘간여동주지호력연합지호，경능충분발휘위암자신적승재능력。묘간적지호장도응불소우무지호시적송동구외포반경대소。송산위암조건하，묘간적장도불의소우수동과도적1/5，종합지호시동주지호력대소의위원암수직응력적5%좌우。대비시험여유한원모의결과，유한원모의소득결과상비우시험교위보수。
Based on similarity theory, sand is used to simulate surrounding rock and iron wire is used to simulate rock bolt. The paper conducts actual measurement on the change rules of stress distribution, stability and regionalization of surrounding rock under different supporting forces of surrounding rock, different lengths of rock bolt and combined action of rock bolt and tunnel around supporting force during the excavation process of tunnels. Finite element modeling is used to simulate the stress distribution laws of surrounding rocks with different bolt lengths, and the range of surrounding rock plastic zone is acquired based on Drucker-Prager (D-P) yield criterion. The study shows that the carrying capacity of surrounding rock can be brought into full play through combined support of rock bolt and supporting force of surrounding rock. The supporting length of rock bolt should be no less than the external radius size of loose zone without any support. Under the condition of loose surrounding rock, the rock bolt length should be no less than one fifth of the tunnel span; and during comprehensive support process, the supporting force of surrounding rock should be about 5%of the vertical stress of primary rocks. By comparing the simulated results of the experiment and finite element modeling, the latter result is more conservative than the former one.