车站基坑揭露断层带注浆加固效果数值模拟研究

doi:10.3973/j.issn.2096-4498.2018.S2.016

中国科学引文数据库（CSCD）来源期刊
中文核心期刊中文科技核心期刊
Scopus RCCSE中国核心学术期刊
美国EBSCO数据库俄罗斯《文摘杂志》
《日本科学技术振兴机构数据库（中国）》

隧道建设（中英文） ›› 2018, Vol. 38 ›› Issue (S2): 111-119.DOI: 10.3973/j.issn.2096-4498.2018.S2.016

车站基坑揭露断层带注浆加固效果数值模拟研究

李志鹏^{1, 2}，李亚璇¹，张立¹，宋天娇¹

（1. 山东交通学院交通土建工程学院，山东济南 250357； 2. 山东大学岩土与结构工程研究中心，山东济南 250061）

收稿日期:2018-04-23 出版日期:2018-12-30 发布日期:2019-01-30
作者简介:李志鹏（1988—），男，山东泰安人，2015年毕业于山东大学，岩土工程专业，博士，讲师，主要从事隧道与地下工程灾害治理理论方面的研究。Email： lizhipengsdu@163.com。
基金资助:
国家自然科学基金重点项目（U1706223）；国家自然科学基金面上项目（51779133）

Numerical Simulation Study on Grouting Reinforcement Effect of Fault Zone Exposed in Station Foundation Pit

LI Zhipeng^{1, 2}, LI Yaxuan¹, ZHANG Li¹, SONG Tianjiao¹

(1. School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China; 2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, Shandong, China)

Received:2018-04-23 Online:2018-12-30 Published:2019-01-30

摘要/Abstract

摘要：

为研究注浆对明挖基坑揭露断层带的加固效果，以南京地铁上元门车站基坑工程为背景，考虑基坑开挖过程中渗流场与围岩应力场的相互耦合作用，建立相应的有限元分析模型，对软弱破碎层、注浆加固带、基坑地下连续墙以及围岩所组成的耦合系统进行模拟，研究注浆加固前后围岩渗流场、位移场以及应力场的特征，最终获得基坑地下连续墙的水平位移、基坑外地表沉降、围岩塑性区分布、基坑内围岩变形以及基坑内涌水量变化规律。研究结果表明： 1）通过对基坑底部断层带的注浆加固，基坑侧向位移及基坑外地表沉降均得到有效控制，相比于注浆加固前，其最大水平位移和地表累计沉降量减小50%以上，满足工程要求； 2）基坑底部区域内塑性区范围明显减少，基坑外塑性区扩散也得到有效抑制； 3）基坑底部断层带注浆改变了渗流场分布，有效降低了基坑涌水量，基坑治理区域涌水量由最初的94 m3/h逐渐减小到4 m3/h，堵水率达96%； 4）注浆结束后现场钻孔取芯率达到75%~80%，开挖揭露大量劈裂作用形成的浆脉，验证了注浆可有效治理明挖基坑所揭露的软弱断层破碎带。

关键词: 地铁车站基坑, 断层带, 注浆加固效果, 基坑开挖, 数值模拟, 地下连续墙

Abstract:

In order to study the reinforcement effect of grouting on the exposed fault zone of opencut foundation pit, taking the the foundation pit project of Nanjing Metro Shangyuanmen Station as an example, the coupling interaction between seepage field and surrounding rock stress field in excavation process is considered. The corresponding finite element analysis model is established to simulate the coupling system consisting of soft broken layer, grouting reinforcement zone, foundation pit retaining wall and surrounding rock. The characteristics of seepage field, displacement field and stress field of surrounding rock before and after grouting are studied. Finally, the horizontal displacement at the retaining wall of the foundation pit, the surface settlement outside the foundation pit, the distribution of the plastic zone of surrounding rock, the deformation of surrounding rock in the foundation pit and the variation rule of the water inflow in the foundation pit are obtained. The results show that: (1)Both lateral displacement and ground subsidence of the foundation pit are effectively controlled by grouting reinforcement of fault zone at the bottom of foundation pit. Compared with that before grouting, the maximum horizontal displacement and the accumulated settlement of ground surface are reduced by more than 50%, which can meet the engineering requirements; (2)The range of plastic zone in the bottom of foundation pit is obviously reduced, and the diffusion of plastic zone outside the foundation pit is restrained effectively; (3)Grouting in the fault zone of the bottom of foundation pit has changed the distribution of seepage field and effectively reduced the water inflow of foundation pit. The water gushing amount of the foundation pit is gradually reduced from the original 94 m3/h to 4 m3/h, and the water reduction rate is 96%; (4)The coring rate of site drilling is 75%-80% after the grouting. The excavation reveals a large number of veins formed by splitting, which proves that the grouting can effectively control the weak fault fracture zone exposed by the open excavation foundation pit.

Key words: metro station foundation pit, fault zone, grouting reinforcement effect, excavation of foundation pit, numerical simulation, underground diaphram wall

中图分类号:

U 455.49

李志鹏，李亚璇，张立，宋天娇. 车站基坑揭露断层带注浆加固效果数值模拟研究[J]. 隧道建设, 2018, 38(S2): 111-119.

LI Zhipeng, LI Yaxuan, ZHANG Li, SONG Tianjiao. Numerical Simulation Study on Grouting Reinforcement Effect of Fault Zone Exposed in Station Foundation Pit[J]. Tunnel Construction, 2018, 38(S2): 111-119.

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车站基坑揭露断层带注浆加固效果数值模拟研究

Numerical Simulation Study on Grouting Reinforcement Effect of Fault Zone Exposed in Station Foundation Pit

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