In recent years sustainability and environmental impacts have been highlighted as an important issue in design and construction particularly in urban area in construction of buildings and bridges. Mirai piler (M-pile) is new rotating pile technology, which was developed in 2020, is highly appreciated for its environmentally friendly functions such as: rapid construction, low noise; low vibration; no waste soil during construction; no ground water contamination. In this study, construction sequence and prediction of axial bearing capacity of M-pile on cohesive soil were introduced. M-pile analysis used with outer diameter of 318.5mm and thickness of 12.7mm. The analysis results show that the ultimate bearing capacity prediction of M-pilein soft clay soil considerablyincrease compared with bored and cast-in-place piles with the same diameter and depth thanks to multipleblades welded along the pile shaft.
Nature exploration, or ecotourism, has been an essential part of tourism, and today takes on a much broader meaning beyond tourism that includes conserving nature and culture and improving people’s lives, especially in the indigenous community. Community-based ecotourism (CBET) has specific benefits closely related to the sustainability of natural ecosystems and community development. CBET can be defined as nature-based tourism, helping shape the types of tourism services, planning and developing destinations provided by communities directly. CBET is supposed to be a sustainable alternative to mass tourism by its potential benefits in Vietnam. The study aims to evaluate the sustainability of four CBET destinations in Central Vietnam through a sustainable ecotourism index (SEI) formed by applying the Analytic Hierarchy Process (AHP) method. Based on the literature review, local people, and experts’ recommendations, a set of fourteen criteria categorized into five groups reflecting the critical attributes of the sustainable CBET that include environmental conservation, economic benefits, community participation, cultural preservation, and empowerment are analyzed. The raw data is obtained from in-depth interviews with 21 experts and 42 households. After normalizing, the results indicate that out of four CBET destinations, one is identified as high sustainability (SEI>4.2), two are neutral (3.4<SEI<4.2), and one is lower than (SEI<3.4). These findings provide implications for extending the AHP theory in tourism and policy implications toward sustainable development in future tourism.
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