Abstract The Qinghai-Tibet Railway has been operating safely for 16 years in the permafrost zone and railroad subgrade is generally stable by adopting cooling roadbed techniques. However, settlement caused degradation of embankment-bridge transition sections (EBTS) one most representative severe distresses. A field survey on 440 bridges (including 880 EBTSs) was carried out employing terrestria...

Recruitment via settlement of pelagic larvae is critical for the persistence of benthic marine populations. For many benthic invertebrates, larval settlement occurs in response to surface microbial films. Larvae of the serpulid polychaete Hydroides elegans can be induced to settle by single bacterial species. Until now, only Pseudoalteromonas luteoviolacea had been subjected to detailed genetic...

Continuous pumping of groundwater will induce uneven ground settlement, which may adversely affect the nearby metro tunnels. In this paper, taking Nantong Metro Line 1 crossing Port Water Plant as an example, surface level measurement and subsurface deformation monitoring using vertically distributed fiber-optic sensing are implemented to acquire settlement emergency water supply conditions. Th...

Abstract It is inevitable for the construction of subways to pass under existing structures in city; this will cause settlement and affect their safety. The soil a complex mixture, hence it difficult determine damage caused by using tunnel boring machine (TBM) method stress balance surrounding soil. Normally, uplift surface are during tunneling . Therefore, large-scale 3D simulations needed stu...

This study evaluated the use of Asaoka and hyperbolic methods to estimate ultimate settlement soft ground treated by vacuum preloading combined with prefabricated vertical drains. For this aim, a large-scale physical laboratory model was constructed. The reinforced-tempered glass box containing soil mass dimensions 2.0 × 1.0 1.2 m (length width depth). Physical models scale for same purpose are...

Mining typically involves extensive areas where environmental monitoring is spatially sporadic. New remote sensing techniques and platforms such as Structure from Motion (SfM) and unmanned aerial vehicles (UAVs) may offer one solution for more comprehensive and spatially continuous measurements. We conducted UAV campaigns in three consecutive summers (2015–2017) at a sub-Arctic mining site wher...

Microbial biofilms induce larval settlement for some invertebrates, including corals; however, the chemical cues involved have rarely been identified. Here, we demonstrate the role of microbial biofilms in inducing larval settlement with the Caribbean coral Porites astreoides and report the first instance of a chemical cue isolated from a marine biofilm bacterium that induces complete settlemen...

The boundary element technique is a practical problem-solving tool and useful in comparison to other currently popular alternatives. In this paper, a circular tunnel of a diameter 3.4 m is to be excavated through a clayey soil and surrounded by concrete lining of a thickness 0.2 m, so the clear internal diameter is 3.0 m. A plane strain analysis is adopted for such problem and the soil is assum...