地下水管理不善引发地质灾害的某工程案例分析

通过对山西某煤层气处理中心填方场地因水管理不当引发地质灾害的工程案例进行分析,探讨了场地变形的主要特征及其诱发因素,并在详细野外工程地质调研和抽水试验的基础上论述了水与场地沉降和边坡滑塌变形之间的密切关系,得出水是场地变形破坏的主要诱发因素,做好水的管理是保证场地长期安全稳定运营的核心,最后提出了以治水为主体的"截水排滞"的治理建议。

Failure mechanism of large-diameter shield tunnels and its effects on ground surface settlements

A new technique for the analysis of the three-dimensional collapse failure mechanism and the ground surface settlements for the large-diameter shield tunnels were presented.The technique is based on a velocity field model using more different truncated solid conical blocks to clarify the multiblock failure mechanism.Furthermore,the shape of blocks between the failure surface and the tunnel face was considered as an entire circle,and the supporting pressure was assumed as non-uniform distribution on the tunnel face and increased with the tunnel embedded depth.The ground surface settlements and failure mechanism above large-diameter shield tunnels were also investigated under different supporting pressures by the finite difference method.

泉州体育场结构设计若干要点问题探讨

泉州体育场结构设计中钢挑篷封头梁落地拱产生的轴压力通过钢筋混凝土异形框架柱向下传递至基础、桩基,拉力则通过落地拱底端销轴埋板下设置的型钢传递给主体结构的型钢混凝土异形框架;阐述了整体倾斜的火炬柱、灯柱的设计要点,对矩形和H形等非圆形截面欲形成空间曲面或空间折面均会遭遇的截面空间扭转问题提出了加厚钢板过渡和以横隔板过渡连接两种解决办法;对体育场主体结构基础外的室内场地工后沉降问题给出了采用梁板结构和地基处理两种处理方案;混凝土异形框架的结构形式兼顾了体育场外立面曲面幕墙设置的便利性,使建筑结构整体能获得的最大合理性和经济性。