Physical Characterization of a Deep Weathering Profile Over Rhyolite in Humid Tropical Peninsular MalaysiaSpringer Science and Business Media LLC - Tập 36 - Trang 3793-3809 - 2018
John Kuna Raj
The weathering profile, exposed at 38.2 km of the Kuala Lumpur—Karak Highway, can be differentiated into three broad zones; the topmost Zone I (pedological soil) comprising A, B and C soil horizons and made up of clayey silty sand with indistinct relict bedrock textures. The intermediate Zone II (saprock) consists of gravelly silty sand with distinct relict bedrock texture and structures, and can ...... hiện toàn bộ
Recommendations for a Quantitative Description of Joint Orientation DataSpringer Science and Business Media LLC - Tập 37 - Trang 1503-1514 - 2018
Marie-Hélène Fillion, John Hadjigeorgiou
A comprehensive joint orientation data collection program is necessary to ensure a sufficient degree of confidence in constructing a structural model. This paper investigates the influence of the number of joints sampled on the characterisation of the joint dip and dip direction. In a series of numerical experiments, Discrete Fracture Networks (DFNs) were used to model joint set populations. The a...... hiện toàn bộ
Influence of Petrogenesis on Suitability of Some Pelitic Rocks as Construction Aggregates in South-Eastern NigeriaSpringer Science and Business Media LLC - Tập 33 - Trang 1395-1407 - 2015
Celestine O. Okogbue, Tochukwu A. S. Ugwoke
Ten rock samples, collected from five studied Albian rock quarry units, were subjected to hand specimen and X-ray diffraction studies to determine their petrography and also to two degradability test versions of soaking and drying to simulate their resistance to intra-seasonal and inter-seasonal weathering that occurs in south-eastern Nigeria. Nine of the samples, which are pelitic in composition,...... hiện toàn bộ
Influencing Factors of the Rebreak of the Key Rock Block of the Main Roof in the GobSpringer Science and Business Media LLC - Tập 40 - Trang 4345-4356 - 2022
Yang Li, Yuqi Ren, Yikun Liu, Nan Wang, Xinghai Lei
In view of the phenomenon that upright triangular zone and inverted triangular zone of the collapsed roof appeared alternately in the gob, a mechanical model of the rebreak of the key rock block (KRB) of the main roof in the gob was established by using theoretical analysis. The main reason for the rebreak of KRB was revealed and the bending moment expression at any point of KRB was obtained. So, ...... hiện toàn bộ
Behaviour of Hybrid Piled Footing Structures in SandsSpringer Science and Business Media LLC - Tập 36 - Trang 2273-2292 - 2018
Behrang Pedram
This paper investigates the lateral displacement and rotational behaviour of a combined footing resting at the ground level with a single pile structure installed in sands through constructing three-dimensional numerical models. In many cases, a pile restrained in a cap is considered as a fixed head pile (θ = 0), which is not a real representation of the case. There are no equations or guidelines,...... hiện toàn bộ
Experimental Study on Loading Rate Effects on the Tensile Strength and Fracture Toughness of RocksSpringer Science and Business Media LLC - Tập 38 - Trang 6923-6930 - 2020
Viktor P. Efimov
The Brazilian method experiments were applied to investigate effects of loading rate on tensile strength of gabbro-diorite, marble, granite. The tensile strength was measured over a wide range of loading rate,
$$\dot{\sigma } = 10^{ - 3} - 10^{2}$$
MPa s. Also the fracture toughness of marble, gabbro-diorite, dolerite were measured over a wide range of loading rate from 5 × 10−4 to 25 MPa m1/2/...... hiện toàn bộ