The Nanling Range in South China is endowed with abundant W-Sn and other important rare metal resources associated granitic intrusions, but the rate of new major mineral discoveries has been drastically diminished over last decades. Data-driven prospectivity mapping (MPM) using machine learning emerging as a powerful tool support exploration targeting at regional or camp scale. However, MPM based on supervised faces some general problems, notably including subtle information obscured data...

Earthen sites are valuable cultural heritage in arid regions of NW China, where a series serious deteriorations have developed. Scaling off is typical type deterioration that greatly threatens the long-term preservation earthen sites. To date, there insufficient studies on formation mechanisms and influence factors scaling off, leading to lack theoretical foundation for further consolidation research. Therefore, establishing scientific evaluation system explore assess its degree development...

The regions of Zhouqu and Wudu in Gansu Province, China, experience some the world's most severe debris-flow-related disasters, such as landslides mudslides. intensity these events is attributed to underlying Silurian slate lithology, which undergoes freeze–thaw dry–wet weathering processes. In addition, regional climate allows processes alternate, intensifies slate. this study, physical was assessed using photographs measurement variations characteristics quality, elastic velocity,...

Although the fully grouted tension anchorage system (T-anchorage system) has been widely used in field of anchoring earthen heritage sites, it always suffered from failure bolt–slurry interface debonding and strong attenuation shear stress along embedment length. In this article, a new type tension–compression composite (TC-anchorage is proposed, which made up pressure bearing with same diameter anchor hole at end bolt. The situ anchorage, pull-out test interfacial stress–strain monitoring...

In order to explore the influence of salt content on permeability in site soils, based laboratory water saturated test, with addition two soluble salts gradient 0.2%(mass fraction) NaCl and Na2SO4in desalination soil, change coefficient soils particular category saline was tested. At same time, internal pore structure samples by mercury injection test tested conform results from microscopic. The show that decreases increase both accord good negative exponential correlation. size distribution...

Fully grouted anchor systems have been widely used for stability control at earthen sites. The bond performance between the bolt and slurry, which is determined from type, diameter, slurry thickness length, has an important influence on working mechanism of system. This paper considers three consisting different types bolts modified glutinous rice slurry. To test relevant physical mechanical indexes soil a site, bolts, in situ anchor, pull-out tests stress–strain monitoring bolt–slurry...

A remarkable risk in the field of rock engineering is natural exposure low-grade metamorphic to freeze-thaw process. Examples such materials are slate and phyllite, which employed approximately mountainous permafrost zones. In order study weathering processes mechanisms following processes, cycles were applied. Accordingly this process, partially or completely deteriorates, mechanical properties, microstructure, mineral content changes commonly associated with processes. This shows that,...

Freeze–thaw cycles under the conditions of snowmelt and rainfall infiltration in winter are triggers for petroglyph weathering. Rock samples from Helan Mountains were subjected freeze–thaw various laboratory testing, mass, elastic wave velocity unconfined compressive strength tested. The results show that mass loss rate, decreased. In addition, according to XRD analyses, content calcite feldspar decreased, SEM microscopic pores grew. Considering mineral micro-voids, variation decreases...

<title>Abstract</title> As a traditional repair material, Chuihui has been maturely used in the restoration work of Leshan Giant Buddha many times. Fundamentally, it is kind mortar processed by "hammering". Over years, mainly divided into Chuihui, mixed and modified Chuihui. This study tested evaluated material on chest abdomen 2001. By measuring thickness, surface hardness, density, longitudinal wave velocity combining results X-ray diffraction analysis, infrared spectroscopy micro-drilling...

The full-length bond wood tensile anchor system (WTS) conventionally used in earthen sites is primarily broken by the debonding of bolt–slurry interface. To solve this limitation, material performance and pull-out tests were performed for a new type tension–compression composite (WTCS) WTS, strain slurry–soil interface monitored. A comparison test results indicated following: average force WTCS approximately 23–51% higher than that WTS. has strong ductility characteristics small elastic...

In order to study the influence of dry-wet cycling on deterioration characteristics gypsum rocks and solve problems encountered in engineering construction, this study, are taken as research object. With combination laboratory test theoretical analysis, numerical simulation particle flow is carried out, physical mechanical properties rock under studied. The results show that gypsum, quartz, zeolite dolomite main components rocks. Gypsum occupies most rocks, so various greatly affect process...

This paper studies the path following control problem for wheeled mobile robots with enhanced transient performance. The is formulated in framework of output regulation design approach incorporating modified composite nonlinear feedback (CNF) strategy. robot model first linearized by input-output linearization method, and then, considering an exosystem as virtual leader its given trajectory, are treated followers. turn transforms considered into controller such that follower can...

Abstract Prospecting for and exploiting buried mineral deposits is currently challenging. Given their high precision resolution, reflection seismic methods might be useful in such applications involving deep deposits. However, there are few open datasets available from deposit exploration, especially hardrock environments. The world‐class Caosiyao porphyry Molybdenum (1.76 Mt) the Jining area of Inner Mongolia, China, largely covered by loess layers, which poses challenges to its...

Collapse is the most devastating disaster in natural landscape scenic spot. There are 34 potential rockfalls distributed different positions of Helankou. All pose a serious threat to rock paintings and tourists. Firstly, we comprehensively investigated genesis, distribution, lithology geometric characteristics rockfalls. Secondly, used rockfall analyze movement process energy change And then found that there was high probability falling points can be painting area tourist boardwalk. So...