施工技术 2011年2月 60 CONSTRUCTION TECHNOLOGY 第40卷第3期 浅埋偏压隧道开挖技术 李志星，张字华，石效民 (北京市公路桥梁建设集团有限公司，北京100068) [要]针对密兴路改建工程火郎将腿道进口轻浅理偏压的骑点，提出了调整进润位置，采用双排注聚小导管超前 支护，反压回镇施工以拉制爆破振动等一系列施工挂术措施，有酸拉利了腿道拱项沉降与洞周板数.监测结果 表明，所采用的施工末港施之有数，能够保证浅埋偏压陋施工的全. [关键词]浅埋编压隧道：超前连护：反压回：控制爆破 [中密分类号]U451 [立战标积码]B [交章编号]1002-8498(2011)03-0060-03 Excavation Technology of Shallow Tunnel Under Unsymmetrical Pressure Li Zhixing Zhang Yuhua Shi Xiaomin Beijing Roads and Bridges Construction Group Corporation Limited Beijing 100068 China) Abstract:Basing on the characteristics of entrance of Huolangyu Tunnel in Mixing road with shallow- buried and unsymmetrical pressure the authors put forward a series of construction measures to effeetively control the arch top settlement and shrinkage surround tunnel which inelude adjusting location of tunnel entrance supporting by double-row advanced ductile grouting back pressure and back fill construction and controlling blasting etc.The monitoring results show that these construction measures are feasible to assure construction safety of tunnel of shallow tunnel under unsymmetrical pressure. Key words:shallow tunnel under unsymmetrical pressure:advanced support:back fill with back pressure:controlled blasting 在设计过程中由于受到线路和地形条件限制，达58.7m 为构造低山剥地貌.隧道Ⅳ级围岩总 隧道局部不可避免地处于浅埋、偏压等不利地形中，长395m 全隧63.9%，V级围岩总长223m 占全 尤其在腿道进出口段，地质条件复杂，岩体风化严腿36.1%，进洞口段表展为2.5m厚的亚钻土，其下 重，开挖过程中如不对浅埋编压加以足够重视，施工为强一中等风化（黑云母）斜长浅粒岩，节理梨隙发 中往往会造成腿道方、衬开裂等安金质量事故.育，岩芯呈短柱一柱状，局部呈碎块状.地质参件总 本文舒对密兴路改建工程火郎裕随道进口浅埋体状况一般，洞口地质条件较差.陋道洞口段衬 ...
浅埋偏压隧道开挖技术.pdf
