With mining depth increasing, the mining structure becomes more and more complex. It is
easy to cause dynamic disaster during coal mining. To reveal the failure process of gas …

Experiments on high-pressure abrasive water jet (AWJ) crushing shale were conducted with
major consideration of bedding planes. The dynamic strain of the shale sample was …

Existing numerical simulation studies show that confining pressure has a negative effect on
the efficiency of percussion drilling. However, the corresponding systematic experimental …

Impact cracks near the borehole are beneficial to geothermal energy development in many
aspects, such as hydraulic fracturing, perforation and so on. However, the quantitative …

Achieving efficient crushing of hard rocks has always been an urgent problem in mining and
tunneling. A novel numerical model of rock fragmentation was developed by the hybrid …

This article conducted studies of percussive drilling, and revealed impact stress wave
propagation mechanisms and rock fragmentation characteristics under percussion. In this …

In response to the issue of increased bottom-hole stress leading to higher rock strength and
reduced rate of penetration, a novel drilling technology has been proposed. This technology …

Low rock breaking efficiency of drilling bit is one of the key factors restricting the large-scale
development of oil gas in deep formations and geothermal energy resources in hot dry rock …

Hot dry rock (HDR) is a renewable and clean energy resource, its efficient exploration has
attracted widespread attention from scholars. However, the rock encountered during drilling …

The compression effect of geostatic stresses and hydrostatic pressure on rock increases with
the depth of geothermal well, which strengthens the rocks and reduces the rate of …