To study the stability and influencing factors of shield tunnel excavation face under deep burial conditions, relying on Bailuyuan in second phase "Water Diversion from Han to Wei River" project, we conducted indoor uniaxial compression tests, repose angle three-dimensional discrete element simulation analysis, calibrated microparameters strata, constructed a model face. The settlement characteristics different were studied. Research results showed that (1) horizontal displacement critical...

A semianalytical solution to determine the minimum safety thickness of rock resisting water inrush from filling-type karst caves was investigated. Mechanical analyses filling materials in located a top, bottom, and lateral position tunnel were carried out by referring principle slice method. The mechanical mechanism analyzed adopting theory elastic mechanics. semiquantitative analytical method for calculating achieved according bending strength shear rock. safety-thickness-prediction models...

Significant research efforts have been invested on studying the response and damage of structures subjected to blast loads for better life property protections. The single-degree-of-freedom (SDOF) approach has widely adopted simplify structural analysis engineering design purpose. However, such an under certain circumstances oversimplifies behavior might not give reliable predictions responses loads. On other hand, although detailed high fidelity finite element (FE) is able relatively...

The addition of discrete steel fibres into concrete has been widely recognised as an effective measure to enhance the ductility, post-cracking resistance and energy absorption matrix subjected impact loads. Despite useful information from experimental studies that investigate macro-scale performance fibre–reinforced under dynamically applied loadings, results a series tests or by different researchers are often found be scattered. Besides variations in testing conditions, random size,...

The mode approximation method (MAM) is an effective approach when analyzing dynamic structural responses and damages to blast loading. pressure-impulse (P-I) diagram generated from the MAM provides efficient accurate estimation of damage simple or combined failure modes. In previous works for assessment underground reinforced concrete structures, soil-structure interaction (SSI) was simplified as a constant damping stiffness effect, pulse shape effect load on P-I diagrams not discussed....

In order to study the mechanical behaviors and fracture process properties of granite under confining pressure unloading with constant axial pressure, RMT-150B rock mechanics test system acoustic emission detector were used characteristics deeply buried specimens different combinations initial pressures rates. The results show that when rate is small, deviatoric stress-strain curve will yield an platform, significant ductility; large, brittleness. Besides, strain increases increase rate,...

The response of monolithic steel plates subjected to blast was extensively studied, and dozens dimensionless numbers were proposed predict the response. While existing are not convenient use in some scenarios with relatively complicated conditions, number for loaded based on dimensional analysis extends range application. Different from other numbers, properties medium which load transmits incorporated extend application more general scenarios. responses plate both near-field non-uniform...

To improve the reliability and reduce carbon emissions of Regionally Integrated Energy System (RIES), this paper proposes a "source/load/storage" collaborative planning framework, in which traditional combined cooling, heating power system (CCHP) is considered to be retrofitted into CCHP with capture (CCS) Power-to-Gas (P2G) (CCP Systems). The sizing PV, multi-energy storage systems (MESS), integrated demand response (IDR), CCP, other energy conversion facilities stations (ESs) are all...

Abstract Increasing demands on high precision manufacturing of parts with complex surfaces have been observed in the last several years. Although significant progress has made machining surfaces, inspection such remains a difficult problem. A critical issue surface is localization design coordinate system (DCS) measurement machine. As to rely manufactured features that contain imperfections, matching method essential order achieve an accurate location. This paper presents CAD-model based...

The location and grade setting of a timber logistics center is an important link in the optimization system, rationality which can effectively improve efficiency supply chain. There long distance between main forested areas China, more than 55% demand depends on imports. Research practice systematically planning centers whole country have not been well carried out, reduces logistics. In this paper, 47 trading markets with certain scale China are selected as basis for selection. Based their...