Results 191 to 200 of about 108,952 (299)

Multi-scalar Analysis of a Southern African Assemblage: The Middle Stone Age at Ha Makotoko, Lesotho. [PDF]

J Paleolit Archaeol
Siemssen T, Arthur C, Dewar G, Lombard M, Mitchell P.   +4 more
europepmc   +1 more source

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

Deep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang, Zaobao Liu, Jing Xue, Bo Lu, Wei Zeng, Dengke Zhang   +5 more
wiley   +1 more source

Tribute to Abel Molepolle and the central role of the Sterkfontein Caves technicians in international palaeoanthropological research

South African Journal of Science
Ronald J. Clarke, Kathleen Kuman, Travis R. Pickering, Jason Heaton, Matthew V. Caruana, Amélie Beaudet, Kristian Carlson, Tea Jashashvili, Job Kibii, Laurent Bruxelles, Recognise Sambo, Maryke Horn, Dominic Stratford   +12 more
doaj   +1 more source

Performance assessment of compression ground anchors in urban deep excavations through numerical and field investigations. [PDF]

Sci Rep
Akbas M, Demirci G, Ozdemir BB, Iyisan R.   +3 more
europepmc   +1 more source

Excavations at Saqqara

, 1907
Quibell, James Edward
core   +1 more source

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Progressive failure mechanisms and dynamic load redistribution in asymmetric excavation with partial bracing collapse. [PDF]

Sci Rep
Chong J, Su F, Wei H, Zheng X, Liu F.
europepmc   +1 more source

Numerical and experimental study on P‐wave propagation across a rock joint with different orientations

Deep Underground Science and Engineering, EarlyView.
Joint orientation significantly affects P‐wave velocity, with the highest velocity at zero‐degree angles, decreasing to 30° as the angle increases. The velocity increases slightly from 30 to 45 degrees but sharply decreases from 45 to 90 degrees. Abstract Determination of the required parameters in different science contexts using the ultrasonic wave ...
Yaghoob Zarei, Mojtaba D. fallahi, Ali Uromeihy, Mohammad R. Nikoodel, Mohammad Fathollahy   +4 more
wiley   +1 more source

Characteristics stochastic analysis of long and narrow deep excavations under soil spatial variability. [PDF]

Sci Rep
Liu S, Wang Z, Chen Y, Fang G, Zhao Y, Yang J, Sun H.   +6 more
europepmc   +1 more source

Instability mechanism and failure characteristics of underground cavern in block system under the action of seismic waves

Deep Underground Science and Engineering, EarlyView.
Seismic waves with tensile stress, high amplitude, and low frequency are most likely to trigger block instability and sliding. Blocks with a single sliding surface are more prone to movement than those with multiple constraints, and roof‐positioned blocks are especially vulnerable to slide.
Xiao Wang, Jinxiao Liu, Gaoshuo Zhang, Wenxin Li, Changdi He   +4 more
wiley   +1 more source