Soft rock headings are characterized by high ground pressure, high deformation and difficulties in supporting.

软岩巷道具有大地压、大变形、难支护的特征。

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The research results can provide a reference for the deformation analysis and stability control of the deep soft rock roadway with high ground pressure.

研究成果可为深部高应力软岩巷道的变形分析与稳定性控制等提供参考。

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Soft rock tunnels have the characteristics of high ground pressure and large deformation and are difficult to be supported. So they can not be easily controlled with single support method.

软岩巷道多具有高应力、变形大、难支护等工程特征，单一支护方式难以控制围岩变形。

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It extracts oil from the ground using a method called fracking - pumping down a mixture of sand, water and chemicals at high pressure.

BBC: US to become 'world's biggest oil producer'