摘要
为减少软土基坑支护的位移和受力,通常采用坑内被动区加固的处理方法,被动加固区的范围多大较合适呢?目前工程中尚缺乏有效的计算方法。为了定量分析基坑工程中被动区土体加固的效果,以及为有限加固宽度情况下m值的取值提供计算方法,该文取加固体为研究对象,分析加固体的受力状态,建立静力平衡方程,得到全层加固体的最优有效加固宽度值。当为有限加固宽度时,m值取值可以近似按加固宽度相对于最优有效加固宽度的线性插值进行计算。采用有限元数值模拟验证了方法的可行性。研究表明,采用该方法计算被动区土体有限加固宽度时的m值是可行的,该法计算得到的支护结构位移是偏安全的。该方法简单适用,可操作性强,容易实现,在工程设计中具有很好的推广应用意义。
In order to reduce the displacement and stress of the soft soil foundation pit support,the soil reinforcement in the passive zone of foundation pit is usually adopted. What is the suitable range of the passive reinforcement area? There is currently no effective calculation method in engineering. In order to quantitatively analyze the effect of soil reinforcement in the passive zone of foundation pit engineering,and provide the calculation method of the m-values under the condition of limited reinforcement width,this paper takes the solidification as the research object,analyzes the stress state of the solidification,and then establishes the static equilibrium equation to get the optimal reinforcement width. value of the full-layer solidification. When the width is limited,the m-values can be approximated by linear interpolation of the reinforcement width. The feasibility of the new method is verified by finite element numerical simulation. The research shows that the mvalues under limited passive zone reinforcement width can be calculated by this method,and the displacement of the support structure calculated by this method is partial and safe. The simple and applicable method which has strong operability not only is easy to implement but also has good promotion and application significance in engineering design.
作者
杨光华
张文雨
陈富强
李志云
YANG Guanghua;ZHANG Wenyu;CHEN Fuqiang;LI Zhiyun(Department of Civil Engineering,South China University of Technology,Guangzhou 510641,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Research Center of Geotechnical Engineering Technology,Guangzhou 510635,China;Guangdong Emergency Technology Research Center of Mountain Torrents Disasters,Guangzhou 510635,China)
出处
《广东水利水电》
2020年第2期13-19,共7页
Guangdong Water Resources and Hydropower
基金
国家自然科学基金(编号:51778152)
广东省科技计划项目(编号:2019B020208003)
关键词
基坑工程
m值法
被动区加固
软土
foundation pit
m-values
passive zone reinforcement
soft soil
