An analysis is made of seepage forces around shield under river by finite differential method and the stability factor of workface with regard to seepage effects is deduced. 基于地下渗流基本方程,采用有限差分法对江底隧道盾构施工中产生的周边渗透力进行了分析,并推导了渗流条件下盾构正面稳定的判别公式。
Besides, when a structure is constructed under river or sea, the open caissons designed in circular shape are adopted as for the foundation of the structures. 此外,在水底或海底进行建筑物施工时,也常采用圆形的沉井作为结构的基础。
Besides, the effect of different thickness to the force distribution of segment structure is considered. ( 3 ) Reliability analysis for shield tunnel crossing under river using load-structure method. 同时,简单的考虑了不同衬砌厚度对管片受力的影响。(3)基于荷载结构法的高水压越江盾构隧道衬砌可靠性研究。
High sulphur deposits with spontaneous firing tendency and under river deposits are restricted to develop due to its technical conditions, especially for the small deposits. 有自燃趋势的高硫矿床与赋存于河谷下的矿床,由于开采技术条件复杂,限制了该类资源的及时开发利用,尤其是一些小型矿产资源。
The necessity of under river mining in Yungang Mine and its mining selecting 云冈矿河下采煤的必要性及采煤方法选择