旋喷桩加固黄土隧道地基固结分析  

Consolidation analysis of jet grouting pile reinforcement in loess tunnel

作　　者：赖金星[1] 樊浩博[1] 谢永利[1] 刘邦哲 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]西安建筑科技大学理学院,陕西西安710055

出　　处：《长安大学学报（自然科学版）》2016年第2期73-79,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省工业科技攻关项目(2015GY185);国家自然科学基金青年基金项目(51008029);青海省交通科技项目(2009-02);陕西省教育厅专项基金项目(11JK0533);中央高校基本科研业务费专项资金项目(310821165011)

摘　　要：为分析高压旋喷桩加固黄土隧道工后长期变形,以西宁西过境高速大酉山黄土隧道地基加固段为依托,采用数值模拟结合现场实测的方法,对依托工程进行了固结分析。研究结果表明：仰拱回填后30d内,隧道变形增长较快,在2 000d达到稳定,数值模拟的隧底最大沉降为6.64mm,现场监测30d内沉降量占总沉降量的82.0%~92.2%,最大沉降为7.5mm;选取50m范围内的沉降变形进行横向比较,距离隧道中心约4倍洞径处沉降十分微小,在0~50m范围内,最大沉降差为5mm,未出现不均匀沉降现象,数值计算结果与现场实测结果吻合;黄土隧道地基加固效果明显,能够满足隧道长期稳定性的要求。研究结果可为采用固结分析方法研究黄土隧道长期变形问题提供借鉴。In order to analyze the post-construction deformation law of loess tunnel which is reinforced by high pressure jet grouting pile,based on the foundation strengthening section of Dayoushan Tunnel of transit highway in west Xining,the post-construction consolidation settlement was analyzed through numerical simulation and field monitoring.The results show that the tunnel deformation grows rapidly within 30 days after pavement completed,and it becomes stable on the 2 000 th day.The biggest settlement of tunnel bottom gained from numerical simulation is 6.64 mm,while within the 30 th day pavement,settlement occupies about 82.0%-92.2% of the total settlement,and the maximum settlement is 7.5 mm according to monitoring results.The deformation of settlement within 50 mis selected to make horizontal comparison.It is very small at the point of four times of hole-diameter from the center of tunnel,and the tunnel doesn＇t appear uneven settlement as the maximum differential settlement is only 5mm within the scopes of 50 m.The numerical calculated results fit well with the monitoring results.The reinforcement effect on loess tunnel is obvious,and the long-term stability of tunnel can be satisfied.The results can provide a reference for analysis of loess tunnel long-term deformation by using consolidation method.

关 键 词：隧道工程 黄土隧道 工后沉降 固结分析 高压旋喷桩 长期变形 

分 类 号：U451[建筑科学—桥梁与隧道工程]