Experimental study of pneumatic fracturing effect in soil under overburden load

HAN Wen-jun; LIU Song-yu; ZHANG Ding-wen

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Experimental study of pneumatic fracturing effect in soil under overburden load

更新时间：2026-06-25

- Experimental study of pneumatic fracturing effect in soil under overburden load
- Vol. 32, Issue 7, (2011)
- 作者机构：
  
  东南大学岩土工程研究所,南京,210096
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411
- Online First：30 June 2011，
  
  Published：2011
- 稿件说明：
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HAN Wen-jun, LIU Song-yu, ZHANG Ding-wen. Experimental study of pneumatic fracturing effect in soil under overburden load[J]. 2011, 32(7).
DOI：

HAN Wen-jun, LIU Song-yu, ZHANG Ding-wen. Experimental study of pneumatic fracturing effect in soil under overburden load[J]. 2011, 32(7). DOI：

摘要

采用自行研制的模型试验装置进行了不同喷气压力和上覆荷载下土体的气压劈裂室内模型试验，分析了喷气压力和上覆荷载对土体气压劈裂效果的影响。试验结果表明，向土体中喷入高压气体能在土体中产生裂隙，裂隙可加速超静孔隙水压的消散；喷气结束时裂隙宽度达到最大值，喷气结束后裂隙不完全闭合，残余裂隙宽度为裂隙宽度峰值的1/100。对比不同喷气压力和上覆荷载作用下气压劈裂试验结果发现，气压劈裂影响范围与裂隙宽度均和喷气压力与上覆荷载大小密切相关，其中喷气压力对气压劈裂影响范围与裂隙宽度的影响更为显著；气压劈裂影响范围与喷气压力呈双曲线相关关系，裂隙宽度与喷气压力呈线性正相关关系；气压劈裂影响范围随上覆荷载增加而减小，裂隙宽度与上覆荷载呈线性负相关关系

Abstract

A series of pneumatic fracturing model tests are performed using a new developed laboratory apparatus to investigate the effect of air pressure and overburden load on pneumatic fracturing. The results indicate that the injection of high-pressure air into soil induces pneumatic fractures

which accelerate the dissipation rate of excess pore pressure. Before the air injection is stopped

the width of fracture reaches maximum and the fracture closes gradually when the air injection is stopped. The width of residual fracture is about one percent of the maximum width of fracture. The results also show that influence area of pneumatic fracturing and width of fractures are relating with air pressure and overburden load. Air pressure has more significant influence than overburden load. The influence area of pneumatic fracturing is related hyperbolically with air pressure; however

the width of fracture has a positive linear correlation with the air pressure

and has a negative linear correlation with the overburden load.

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