【作者】 陈广思； 刘润；

【Author】 Chen Guangsi;Liu Run;State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University;

【机构】 水利工程仿真与安全国家重点实验室天津大学；

【摘要】 作为深海油气工程中水下生产系统的重要基础形式,防沉板具有埋深浅、水下施工方便等优点。为了满足基础抗滑移的要求,可在防沉板底部设置裙板,裙板的存在增加了防沉板水平向承载力计算的难度。本文将带裙板防沉板基础简化为带裙板条形基础进行研究,通过开展砂土地基上防沉板基础水平向地基承载力模型试验,研究了防沉板基础在水平荷载下的承载规律。提出了一个能够反映裙板与基础内部土体共同作用的经验参数——水平向土体破坏率(η),建立了适用于防沉板基础的水平向极限承载力分析的破坏机动场。通过极限分析上限定理推导了砂土地基上带裙板条形基础的水平向地基承载力的上限解,确定了土体破坏率与H/B的拟合关系。更多还原

【Abstract】 The mudmat is an important foundation form for deepwater oil and gas engineering in the subsea production system. The mudmat has many advantages, such as lower buried depth and convenient construction. The existence of the skirts, which is set up the bottom of the mudmat in order to adapt the requirements of foundation slip resistance, increases difficulty of the vertical bearing capacity of mudmat calculation. The mudmat is simplified to skirted strip foundation in this paper. The bearing capacity model tests of mudmat are carried out in sand to study bearing rule of mudmat under horizontal load bearing. The horizontal soil damage rate as a new empirical parameter about combined action between shirts and inner soil of foundation has been defined. Schematic diagram of velocity field section is established to suit for horizontal bearing capacity of skirted mudmat analysis. The upper value of the horizontal bearing capacity of skirted mudmat is obtained by the upper bound theorem of limit analysis. Fitting relationship between ηh and H/D is obtained,更多还原