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Waste mud processing is an urgent problem in in situ construction with no existing method of address. Identifying a highly effective, low-energy and environmentally friendly treatment method would hold great significance. This paper introduces a fast, economic and environmentally friendly construction technology centred on the in situ solidification process. After solidification, bearing capacity and strength of mud pool increases rapidly and it can then be used as roadbed filling or directly as a highway roadbed or building foundation. Combined with the actual general situation of projects, laboratory mixing tests were conducted by using the cement, fly ash, superfine slag powder and plant ash as solidification additives. Vane strength and in situ loading tests were conducted, in which waste mud processing effects were evaluated using the proposed in situ solidification construction technology as a basis. In addition, exponential curve and hyperbolic models were adopted to fit incomplete original loading data, from which the ultimate bearing capacity of the testing field region was obtained. A bearing capacity prediction technique evaluating in situ solidification technology suitable for field use was proposed through comparison and analysis of contrasting measured results.

The problem of two collinear cracks in an orthotropic solid under antisymmetrical linear heat flow is investigated. It is assumed that there exists thermal resistance to heat conduction through the crack region. Applying the Fourier transform, the thermal coupling partial differential equations are transformed to dual integral equations and then to singular integral equations. The cracktip thermoelastic fields including the jumps of temperature and elastic displacements on the cracks and the mode II stress intensity factors are obtained explicitly. Numerical results show the effects of the geometries of the cracks and the dimensionless thermal resistance on the temperature change and the mode II stress intensity factors. Also, FEM solutions for the stress intensity factor are used to compare with the solutions obtained using the method. It is revealed that the friction in closed crack surface region should be considered in analyzing the stress intensity factor .

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