With the purpose of testing the effectiveness and feasibility of Ground Penetrating Radar ( GPR) in settling a common construction quality problem which is the thickness estimation of backfill grouting, we conduct a field experiment in Shanghai. A shield tunnel segment, with half of its outer surface covered by a wooden box, is put vertically on the ground. We inject the concrete grout into the…
In southern China, The moisture condensation is common in the urban underground facilities due to the humid and rainy climate. In order to reduce the maintenance costs the natural ventilation should be used in urban pedestrian underpass as far as possible. The planar layout of the underpass is very important for its ventilation effect so as to avoid condensation problem. Taking the Cuiliu stree…
Asphalt mixtures are a type of thermorheologically simple materials, so the study work on thermal stresses in asphalt pavements should be carried out beyond the scope of thermalviscoelasticity theory. Taking thermalviscoelasticity theory as a guide, the stress relaxation test of asphalt mixtures is studied in different temperature environment. The test data are analyzed and the interrelated mod…
The structure of steel deck surfacing is different from that of the common asphalt pavement on highway. The interaction between tyre and surfacing, which took geometric nonlinearity, material nonlinearity and non-linear interaction into consideration, was analyzed in this paper. A strain energy density function called Rivilin model was used to simulate the mechanical performance of tyre. The La…
The overweight vehicles create complex moving vehicle loads described as dynamic, three-dimension non-uniformly distributed contact stresses between tire and pavement surface. But existing calculation models and methods for structure mechanics of pavement cannot analyze the mechanical response of pavement under complex vehicle loads. Based on the theory of three-dimension elastic dynamics, the …
Ruang Koleski Umum Rak: 2
Ruang Koleski Umum Rak: 2