Hydraulic fracturing characteristics and evaluation of fracturing effectiveness under different anisotropic angles and injection rates: An experimental investigation in absence of confining pressure

2022 ◽  
Vol 97 ◽  
pp. 104343
Author(s):  
Yu Zhao ◽  
Yongfa Zhang ◽  
Chaolin Wang ◽  
Qiang Liu
Keyword(s):  
Experimental Investigation ◽  
Hydraulic Fracturing ◽  
Confining Pressure ◽  
Injection Rates

Experimental investigation on hydraulic fracturing in cement mortar with tensile stress

2021 ◽  
pp. 108058
Author(s):  
Hongwei Zhang ◽  
Zhenzhong Shen ◽  
Liqun Xu ◽  
Lei Gan ◽  
Zekai Ma ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Tensile Stress ◽  
Hydraulic Fracturing ◽  
Cement Mortar

scholarly journals Experimental Investigation on Small-Strain Stiffness of Marine Silty Sand

2020 ◽  
Vol 8 (5) ◽  
pp. 360 ◽  
Author(s):  
Qi Wu ◽  
Qingrui Lu ◽  
Qizhou Guo ◽  
Kai Zhao ◽  
Pen Chen ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Void Ratio ◽  
Reduction Rate ◽  
Confining Pressure ◽  
Small Strain ◽  
Silty Sand ◽  
Bender Element ◽  
Small Strain Stiffness ◽  
Alternative State ◽  
State Index

The significance of small-strain stiffness (Gmax) of saturated composite soils are still of great concern in practice, due to the complex influence of fines on soil fabric. This paper presents an experimental investigation conducted through comprehensive bender element tests on Gmax of marine silty sand. Special attention is paid to the influence of initial effective confining pressure ( σ c 0 ′ ), global void ratio (e) and fines content (FC) on Gmax of a marine silty sand. The results indicate that under otherwise similar conditions, Gmax decreases with decreasing e or FC, but decreases with increasing FC. In addition, the reduction rate of Gmax with e increasing is not sensitive to σ c 0 ′ , but obviously sensitive to changes in FC. The equivalent skeleton void ratio (e*) is introduced as an alternative state index for silty sand with various FC, based on the concept of binary packing material. Remarkably, the Hardin model is modified with the new state index e*, allowing unified characterization of Gmax values for silty sand with various FC, e, and σ c 0 ′ . Independent test data for different silty sand published in the literature calibrate the applicability of this proposed model.

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