In situ sequestration of CO2 in mantle peridotites has been proposed as a method to alleviate the amount of anthropogenic CO2 in the atmosphere. This study presents the results of 8-month long laboratory fluid-rock experiments on representative mantle rocks from the Oman-United Arab Emirates ophiolite to investigate this process. Small core samples (3 cm long) were reacted in wet supercritical ...

Influences of two different sample preparation methods, mechanical polishing and plunge cutting, on nanoindentation behavior of a Zr-based bulk metallic glass were studied. Mechanical polishing suppresses the serrated flow but promotes the creep. In contrast, plunge cutting promotes the serrated flow but suppresses the creep. However, hardness and elastic modulus obtained from these two methods...

an important concern in rock mechanics is non-homogeneity as joints or fault. this noticeable feature of failures in rock is appearance of slip surfaces or shear bands, the characteristics of that are associated with deformation being concentrated in a narrow zones and the surrounding material remaining intact. adopting the joints as fractures, fractures are well known for their effects on the ...

Construction of a second theater underground at the Gateway Arch in St. Louis required a quiet, non-intrusive means of rock removal, capable of cutting the vertical walls of the theater down to a depth of 4.5 meters, within a vertical accuracy of 2.5 cm. A low pressure (35 MPa) abrasive laden waterjet was developed for this; and, also modified as an abrasive waterjet drill to emplace 25 mm diam...

Aiming at strong mining pressure and large deformation of surrounding rock in the main roadway, a mechanical model advanced abutment distribution long-wall face was established. The reason for roadway found to be unreasonable position stop line, which brings under influence operations. Therefore, on premise an unaltered technique cutting roof use relief protect were proposed. will form weak sur...

The evaluation of rock mechanic characteristics shale reservoir is the key for success fracturing. Several limitations such as complex lithology can affect accuracy property computation. In this research, mechanical properties reservoirs were analyzed based on experimental tests including shale-reservoir mineral composition, uniaxial compressive strength, and triaxial compression tests. results...

The hardmetal cutting tools used in machining are submitted to extreme conditions in terms of temperature and mechanical loading. A better understanding of the failure of cutting tools and capability to predict tool life are key factors in the development of new tool materials with improved mechanical behaviour. Main failure mechanisms are wear, thermal–mechanical fatigue and brittle fracture. ...

At present, almost all mountain tunnels in Japan are excavated and constructed utilizing the New Austrian Tunneling Method (NATM), which was advocated by Prof. Rabcewicz of Austria in 1964. In Japan, this method has been applied to tunnel construction since around 1978, after which there has been a subsequent decrease in the number of casualties during tunnel construction. However, there is sti...