海底缓坡场地地震侧移数值分析方法

邵广彪; 冯启民; 王华娟

doi:10.16285/j.rsm.2006.09.036

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海底缓坡场地地震侧移数值分析方法

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- 海底缓坡场地地震侧移数值分析方法
- A method for numerical analysis of earthquake induced lateral displacements of submerged gentle slope
- 岩土力学 2006年第9期页码：1601-1606
- 作者机构：
  
  1. 中国海洋大学工程学院
  2. 中国海洋大学工程学院,山东,青岛,266071
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2006.09.036
  中图分类号： TU435
- 纸质出版：2006
- 稿件说明：
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[1]邵广彪,冯启民,王华娟.海底缓坡场地地震侧移数值分析方法[J].岩土力学,2006(09):1601-1606.

SHAO Guang-biao, FENG Qi-min, WANG Hua-juan. A method for numerical analysis of earthquake induced lateral displacements of submerged gentle slope[J]. 2006, (9): 1601-1606.
[1]邵广彪,冯启民,王华娟.海底缓坡场地地震侧移数值分析方法[J].岩土力学,2006(09):1601-1606. DOI： 10.16285/j.rsm.2006.09.036.

SHAO Guang-biao, FENG Qi-min, WANG Hua-juan. A method for numerical analysis of earthquake induced lateral displacements of submerged gentle slope[J]. 2006, (9): 1601-1606. DOI： 10.16285/j.rsm.2006.09.036.

摘要

地震动使海底倾斜土层软化、液化并产生永久变形和位移。基于有限元理论

提出一种海底缓坡场地地震引起水平侧移的数值计算方法

将波浪荷载简化为恒定压力荷载和初始孔压

采用二维有效应力动力有限元分析方法进行液化分析

同时由模量软化理论得到土层在地震动各时段的模量

通过非线性静力方法计算软化、液化引起的水平侧移。由算例分析了土层坡度、液化层及上覆非液化层厚度、波浪荷载等因素对侧移的影响

通过对比分析表明了该方法的有效性

可为近海工程场地地震地质灾害评价提供参考数据。

Abstract

Soil softening and liquefaction due to earthquake cause permanent deformations and displacements of submerged slope. Based on finile element theory

a numerical method for lateral displacement analysis of submerged gentle slope is presented. Wave loads are simplified as constant pressure and initial pore pressure. Liquefaction analysis is performed by 2-d dynamic effective stress finite element method. In each time segment

gradually softened modulus are calculated based on module soften theory; lateral displacements analysis are performed with the new modulus by nonlinear static method. By examples

the influences on lateral displacements are studied with different slope angles

wave loads

thicknesses of liquefied layers and surface non-liquefied layers. Compared with the results of other researches

the validity of the new method was confirmed and it is applicable to solutions of earthquake geological hazards evaluating in offshore engineering field.

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