条形药包爆炸挤密黄土路堤横向影响规律

魏连雨; 李海超; 刘艳竹

doi:10.11883/bzycj-2016-0298

条形药包爆炸挤密黄土路堤横向影响规律

doi: 10.11883/bzycj-2016-0298

魏连雨^{1, 2},
李海超^{1, 3, ,},
刘艳竹⁴

1.
河北工业大学土木与交通学院, 天津 300401
2.
河北省土木工程技术研究中心, 天津 300401
3.
陆军军事交通学院国防交通系, 天津 300161
4.
天津市天津大道养护管理中心, 天津 300350

基金项目:

河北省交通运输厅科技计划项目 20140629

详细信息

作者简介:
魏连雨(1957—), 男, 博士, 教授

通讯作者:
李海超, chang-0117@163.com

中图分类号: O389;U416.1
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出版历程
- 收稿日期: 2016-09-28
- 修回日期: 2016-12-19
- 刊出日期: 2018-01-25

Lateral influence rules on explosion-compacted loess embankment by linear explosive bars

WEI Lianyu^{1, 2},
LI Haichao^{1, 3
, ,},
LIU Yanzhu⁴

1.
School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China
2.
Civil Engineering Technology Research Center, Hebei Province, Tianjin 300401, China
3.
National Defense Transportation Department, Military Transportation University, Tianjin 300161, China
4.
Road Maintenance and Management Center, Tianjin, Tianjin 300350, China

摘要

摘要: 为了合理设计既有公路路堤爆炸挤密钻孔的平面布置方案，以爆炸挤密加固某高速公路黄土路堤为例，研究了条形药包爆炸挤密黄土路堤的横向影响规律。先根据该高速公路实际几何尺寸和材料参数建立有限元模型，然后用ANSYS/LS-DYNA分等横截面不等长和等长不等横截面两类条形药包共计16种工况进行数值模拟，得出爆腔水平半径、土壤密度峰值及其位置和爆炸挤密黄土路堤横向影响半径的变化规律，此外还拟合出横截面为2支药管组成的条形药包爆炸挤密后土壤的密度增量与该点距爆心的水平距离和药量之间的关系表达式。最后，结合工程实例，说明了上述规律在施工方案设计中的应用。
- 道路工程 /
- 爆炸挤密 /
- 条形药包 /
- 黄土路堤 /
- 横向影响
Abstract: In order to rationally design the plane layout scheme of drilling holes for explosion compacting the loess embankment of an existing highway, this paper took the loess embankment of a highway reinforced by explosion compaction(EC) as an example and studied the lateral influence rules on EC with linear explosive bar. Firstly, a finite element model was established according to the actual geometry and material parameters of the highway. Then, based on the numerical simulation of sixteen cases carried out by ANSYS/LS-DYNA, the change rules of the horizontal radius of the explosion cavity, the peak values of soil density and their position, the lateral influence radius of explosion compacting loess embankment were obtained. These sixteen cases belong to two kinds of situations. One kind is of explosive bars with equal cross section and unequal length, while another one is of those with equal length and unequal cross section. Moreover, the relationship functions among the increment of soil density after EC with the explosive bar whose cross section was composed of two explosive tubes, the horizontal distance to the core of the explosive bar and the amount of explosive were fitted. Finally, combined with the actual EC engineering of the highway, the application of the above rules in the design of construction scheme was illustrated.
- road engineering /
- explosion compaction /
- linear explosive bar /
- loess embankment /
- lateral influence

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图 1 有限元模型

Figure 1. Finite element model

下载: 全尺寸图片幻灯片

图 2 2号岩石乳化炸药

Figure 2. No.2 rock emulsion explosive

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图 3 模拟得到的爆腔

Figure 3. Simulated explosion cavities

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图 4 爆炸挤密后土壤密度横向分布

Figure 4. Horizontal distribution of soil density after explosion compaction

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图 5 爆腔半径、土壤密度峰值位置及横向影响半径随药包横截面等效半径的变化

Figure 5. Changes of explosion cavity radius, peak soil density position and lateral influence radius with effective radius of explosive

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图 6 爆腔半径和爆炸挤密土壤的横向影响半径与药包横截面等效半径的比值随药包横截面等效半径的变化

Figure 6. Ratios of explosion cavity radius and lateral influenceradius to effective radius of explosive varying with effective radius of explosive

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图 7 待加固路段钻孔平面布置示意图

Figure 7. Plan layout of drilling holes on the road to be reinforced

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图 8 条形药包

Figure 8. Linear explosive ba

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表 1 有限元模型中路面结构层的主要参数

Table 1. Key parameters of pavement structure layers in finite element model

结构层	ρ_c/(g·cm^-3)	E_c/MPa	μ_c	σ_cy/MPa	E_cτ/MPa	β_c
路面层	2.70	350	0.20	0.8	30	0.40
基层	2.40	460	0.27	0.5	42	0.80
垫层	2.20	390	0.28	0.3	35	0.60

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