High temperature is recognized as one of the extreme environments in application shotcrete which significantly deteriorate performance shotcrete. This paper reviews mechanical properties and microstructure under high temperature. First all, this cause formation ground Based on these causes, author establishes a heat transfer model with spiral shape by introducing multidimensional morphological ...

The field and laboratory investigations performed in the Frøya subsea road tunnel, constructed between 1998 2000, focus on degree of leaching undergone by steel fiber-reinforced shotcrete fresh saline groundwater. Shotcrete samples were extracted core drilling at two locations: middle tunnel approximately 150 m below sea level, near one portals. Leaching is only evident first location identifie...

Finite element technique is used to model two phases of tunneling process, namely; excavation and rocklining interaction. The excavation phase is responsible for determining the pre-lining rock mass deformations and the reduced in-situ stresses. The interaction phase models the compatibility of the rock-lining system. The deformations and stresses of the rock-lining system and the final rock ma...

Proyek pembangunan Gedung Gelanggang Inovasi dan Kreativitas Universitas Gadjah Mada (GIK-UGM) berada di kota Yogyakarta. Banyaknya bangunan sekitar ini, jadi perlu adanya perkuatan ketika akan membangun sebuah gedung. Penggunaan metode soil nailing shotcrete pada basement sebagai upaya agar tidak terjadi pergeseran tanah bangunan. Di sisi lain penggunaan naling metodenya mudah dilaksanakan men...

Uniaxial and triaxial compression tests on steel fibre reinforced shotcrete (SFRS) have been used to quantify the elastic–plastic response behaviour for both the peak and post-peak regions. The laboratory tests were conducted with a servo-controlled testing machine to obtain complete stress–strain curves. The test results include unconfined and triaxial compressive strengths, shear strengths an...

Shotcrete manipulator has been widely used in the construction of high-speed railways, coal mines and other tunnels. At present, workers are still using remote controller to control for spraying operations. There problems such as high operation risk, large personal injuries, low quality. In order improve automation tunnel construction, this paper proposes a motion planning method based on an 8R...

This paper presents a genetic algorithm for automating the design process for underground tunnels. The tunnel cross-sectional profile must enclose a prescribed minimum space polygon, and for stability the bending moments in the shotcrete lining must not exceed certain limits. The engineer seeks to achieve these aims while minimizing the volume of rock to be excavated. We describe the five param...