摘要
针对无自稳能力及基本自稳的2类软弱地层，分别选用安全系数和地表沉降作为评价指标，采用考虑流固耦合的数值方法对加固范围及强度参数进行分析，同时根据不同埋深隧道的破坏模式，对横向加固范围进行探讨。研究表明，加固圈的厚度及强度需同时满足一定条件方可取得较理想的效果，对于非自稳地层，加固厚度以2～2．5m为宜，加固圈强度提升至原地层的6倍可基本保证地层自稳；对于基本稳定地层，加固圈厚度以1．5～2m为宜，加固圈强度提升至原地层的5倍为宜；最后通过计算验证了根据地层破坏机理提出的加固范围。
For the non-self-stabilizing weak stratum and the basic sell-stabilizing weak stratum, claoosmg safety coefficient and surface settlement as evaluation indictors, the numerical method considering fluid- mechanical interaction is used for the analysis of pre-reinforcement scope and strength parameters. Based on the damage modes of tunnels in different depth stratums, the scope of lateral reinforcement is discussed. The study shows that （ 1 ） the thickness and strength of reinforcing rings are required to meet certain conditions simultaneously to obtain a better effect; （2） for the non-self-stabilizing stratum, to guarantee stable stratum basically, the thickness of reinforcement area is 2 - 2.5 m appropriately, and the strength of reinforcing rings should be increased to 6 times of that of the original stratum ; （3） for the basic self-stabilizing stratum, the thickness of reinforcing rings is 1.5 - 2 m appropriately, and the strength should be increased to 5 times of that of the original stratum. Finally, the proposed reinforcement scope according to stratum damage mechanism is verified by numerical calculation.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第5期109-114,共6页
Journal of Highway and Transportation Research and Development
基金
国家科技支撑计划项目子课题(2012BAK24B02)
国家自然科学基金项目(51008309
51208516)
关键词
隧道工程
加固参数
数值分析
软弱地层
安全系数
tunnel engineering
reinforcement parameter
numerical analysis
weak stratum
safetycoefficient
