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丰水区破碎带及断层隧道的设计技术研究成果缺乏系统性,与本工程实际要求相差甚远。本文以广东省某穿越破碎带及断层高速公路隧道的实际设计情况,对丰水区破碎带及断层隧道的相关设计技术进行了探讨。建议:为了保证岩土体的稳定性,在对隧道洞门进行设计时应考虑隧道洞口的地质和地形条件,进洞方案尽量采用开挖小的方案,减少隧道洞口边仰坡的开挖;暗洞结构的初期支护宜采用复合式衬砌,以锚杆、湿喷混凝土(钢筋挂网)、钢拱架等,二次支护为模筑混凝土或钢筋混凝土,二者共同作用组成永久性承载结构;丰水区破碎带及断层存在突水、突泥的可能,应采取注浆加固围岩,并采取分区防水措施;明洞顶部可采用碎石土夯实(压实度不小于90%),以有效提高结构抗震性能。深埋段暗洞结构按间距不大于50m设置宽度2~3cm的抗震缝,地震时能够有效吸能。
The research results of the design technology of the fractured zone and fault tunnel in the Fengshui area lacks systematicness and falls far short of the actual requirements of this project. In this paper, the design of broken tunnels and fault tunnels in Feng Shui area are discussed based on the actual design of a tunnel crossing the crushing zone and fault freeway in Guangdong Province. Suggestion: In order to ensure the stability of rock and soil mass, the geological and topographical conditions of the tunnel entrance should be considered in the design of the tunnel entrance door. The hole excavation scheme adopts the scheme of small excavation as much as possible so as to reduce the excavation of the hillside of the tunnel entrance. The initial support of dark hole structure should adopt composite lining to bolt, wet shotcrete (steel mesh), steel arches, etc., secondary support for the concrete or reinforced concrete, the two constitute a permanent role Bearing structure; Fengshui District broken belt and fault water inrush, mud may be grouting reinforcement surrounding rock, and take the partition waterproofing measures; Myeong-dong top can be used compacted gravel soil (compaction of not less than 90% ), In order to effectively improve the seismic performance of the structure. The deep-buried dark-hole structure should be provided with an anti-seismic seam with a width of 2 ~ 3cm at an interval of not more than 50m so as to effectively absorb energy during an earthquake.