3DEC-用户手册-概况翻译

3

Dimensional

D

istinct

E

lement

C

ode

User’s Guide

3dec

用户指南

1 INTRODUCTION

1.1 Overview

3DEC

is a three-dimensional numerical program based on the distinct element method

for

discontinuum

modeling.

The

basis

for

this

program

is

the

extensively

tested

numerical

formulation

used

by

the

two-dimensional

version,

UDEC

(Itasca

1996).

3DEC

simulates the response of discontinuous

media (such

as a jointed rock mass)

subjected

to

either

static

or

dynamic

loading.

The

discontinuous

medium

is

represented

as

an

assemblage

of

discrete

blocks.

The

discontinuities

are

treated

as

boundary

conditions

between

blocks;

large

displacements

along

discontinuities

and

rotations of blocks are allowed. Individual blocks behave as either rigid or deformable

material.

3DEC

是一个三维数值方案的基础 上不连续建模的离散单元法。

本方案的基础是广泛的测试

数值制 定的二维版本，

UDEC

（

1996< /p>

年艾塔斯卡）所使用的。

3DEC

模拟不连续介质（如

节理岩体）

受到静态或 动态负载响应。

非连续介质离散块的组合作为代表。

被视为块之 间的

边界条件的不连续性

;

块沿连续性 和旋转的大位移是允许的。个别区块表现为刚性或变形的

材料。

Deformable blocks are subdivided into a mesh of finite difference elements, and each

element responds according to a prescribed linear or nonlinear stress-strain law. The

relative

motion

of

the

discontinuities

is

also

governed

by

linear

or

nonlinear

force-displacement

relations

for

movement

in

both

the

normal

and

shear

directions.

3DEC

has several built-in material behavior models, for both the intact blocks and the

discontinuities, that permit the simulation of response representative of discontinuous

geologic, or similar, materials.

3DEC

is based on a

“Lagrangian” calculation scheme

that

is

well- suited

to

model

the

large

movements

and

deformations

of

a

blocky

system.

变形块被分成一个网格的有限差分元素，每个根据订明的线性 或非线性应力应变法元素响

应。也是由正常和剪切方向运动的线性或非线性力

-

位移关系的相对运动的不连续性。

3 DEC

有几个内置的，

材料的行为模式，

完整的块和不连续性，

允许响应代表的不连续的地

质，或相似 ，材料模拟。

3DEC

是基于一个“ 拉格朗日”计算计划，是非常适合模型的大

动作和一个块状系统的变形。

The distinguishing features of 3DEC are summarized below.

3DEC

的显着特征总结如下。

?

The rock mass is modeled as a 3D assemblage of rigid or deformable blocks.

岩体是仿照作为刚性或变形块的三维组合。

?

Discontinuities are regarded as distinct boundary interactions between these blocks;