滨海地区土岩复合地层城市轨道交通车站深大基坑施工稳定性分析
杜岩1殷建国2李文斌2王宝泉2宋卓华3,4
Stability Analysis of Deep and Large Foundation Pit Construction for Urban Rail Transit Station in Soil Rock Composite Stratum in Coastal Area
DU Yan1Yin Jianguo2LI Wenbin1WANG Baoquan2SONG Zhuohua3,4
-
作者信息:1.中交（成都）城市开发有限公司， 641400, 成都
2.中交公路规划设计院有限公司， 100007, 北京
3.中交集团绿色建筑技术研发中心， 100022, 北京
4.中交建筑集团有限公司， 100022, 北京
-
Affiliation:1.CCCC (Chengdu) Urban Development Co., Ltd., 641400, Chengdu, China
2.CCCC Highway Planning and Design Institute Co., Ltd., 100007, Beijing, China
3.CCCC Group Green Building Technology R & D Center, 100022, Beijing, China
4.CCCC Construction Group Co., Ltd., 100022, Beijing, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2024.03.033
-
中图分类号/CLCN:U455.43∶U231.4
-
栏目/Col:研究报告
摘要:
［目的］基坑开挖会引起周围地层和建(构)筑物产生变形，轻则影响施工进度，重则造成工程事故。为了保证城市轨道交通车站深大基坑的稳定性和安全性，需对基坑开挖过程中土层与围护结构的受力和变形特性进行研究。［方法］以青岛某地铁车站深大基坑为工程背景，结合土岩复合地层特性，采用数值模拟方法对深大基坑各施工工况下的变形及内力进行分析。结合现场数据，研究土岩复合地层下深大基坑开挖过程中地面沉降、围护桩位移及支撑轴力的变形规律。［结果及结论］数值模拟表明：未施工双轴高压旋喷桩时，端头井东墙、西墙及南墙均发生侧向位移，且侧向位移方向均朝向基坑内部，最大侧向位移为2.19 mm，发生在南墙中部；施工双轴高压旋喷桩时，基坑端头井一侧旋喷桩加固过程中，端头井侧墙变形量出现峰值，最大变形量为2.21 mm。未施工双轴高压旋喷桩时，地连墙内力变化峰值出现在其腰部，最大值为101 kN；施工双轴高压旋喷桩时，端头井旋喷桩加固地层侧的地连墙结构内力变化明显，其内力变化峰值出现在地连墙腰部，最大值为96 kN。由此可见，双轴高压旋喷桩对基坑各施工工况下的地连墙的内力有一定的减小作用，但对基坑变形影响不大。
Abstracts:
［Objective］ Excavation of foundation pit will cause deformation of surrounding strata and buildings , which affects construction progress and even causes engineering accidents in some degree. In order to ensure the stability and safety of deep large foundation pit in urban rail transit stations, it is necessary to study the stress and deformation characteristics of the soil layer and the enclosure structure during the foundation pit excavation.［Method］ With the deep foundation pit excavation for a metro station in Qingdao as the project background and in view of the characteristics of soil rock composite stratum, numerical simulation method is used to analyze the deformation and internal force of the deep foundation pit. Based on the on-site data, the deformation law of ground settlement, retaining pile displacement and supporting axial force during excavation of deep foundation pit under soil rock composite stratum is studied. ［Result & Conclusion］ The numerical simulation shows that when biaxial high-pressure rotary jet grouting pile is not under construction, the lateral displacement occurs in the east, west and south walls of the end shaft, all towards the internal of the foundation pit, and the maximum lateral displacement of 2.19 mm occurs in the middle of the south wall. During the construction, the deformation of the side wall of the end shaft reaches peak in the process of reinforcement of the rotary jet grouting pile at the end shaft of the foundation pit, and the maximum deformation is 2.21 mm. When the biaxial high-pressure rotary jet grouting pile is not under construction, the peak value of the internal force of the diaphragm wall appears at its waist, and the maximum value is 101 kN. During construction, the internal force of the diaphragm wall structure at the stratum side strengthened by the end shaft jet grouting pile changes obviously, and the peak value of the internal force appears at the waist of the diaphragm wall, and the maximum value is 96 kN. It can be seen that the biaxial high-pressure rotary jet pile has certain effect on reducing the internal force of the diaphragm wall under different construction conditions, but has little effect on the deformation of foundation pit.
- 上一篇: 高铁物流运输模式及其可行性
- 下一篇: “融合”—城市轨道交通发展的关键路径
过刊浏览
资料下载
友情链接