Abstract:Sandy pebble stratum is a kind of typical mechanical instability stratum. Shield tunneling often encountered difficulties such as unearthed difficulties， cutter disc wear and groundwater gushing. Aiming at the complex variability of the material composition and structure of this kind of stratum， sandy pebble soil sampling are selected in Luoyang Metro Line 2， and the properties of sandy pebble soil under different stone content are studied by using large direct shear test， slump test and permeability test. The results show that the shear strength and internal friction angle of sandy pebble soil increase nonlinearly with the increasing of stone content， and the shear strength and friction angle increase slow when stone content is less than 30%. The shear strength and internal friction angle increase significantly when the stone content is 30%~70%， and the shear strength and the internal friction angle are not obviously changed when the stone content is more than 70%. The slump of sandy pebble soil decreases with the increasing stone content and a demarcation rate of about 50% of the stone content is found. The permeability coefficient of sandy pebble soil increases with the increasing stone content and shows a similar rule like the shear strength and the internal friction angle.

Abstract:Based on the study of the mix proportion of DSP(Densified Containing homogeneously arranged ultrafine Particles)for the sake of rock anchor grouting, the effects of water-binder ratio, volume of nanometer silica and different curing methods on the mechanical behaviors of the grouts have been investigated. A serial of appropriate proportion of DSP grout with good working performance were successfully found. The 48 h compressive strength in （80±2） ℃ hot water curing reached 127 MPa, the 7 d and 28 d compressive strength in standard curing reached 99 MPa and 120 MPa respectively, and the 7 d and 28 d compressive strength in underground natural cave curing reached 81 MPa and 109 MPa respectively.

Abstract:EMC（Energetically Modified Cement）技术是一项基于粉磨工艺的新技术．其对RPC性能的影响目前尚不明确．试验研究了EMC技术的使用对RPC流动度和各类型高效减水剂的最佳掺量的影响，同时通过试验探讨了EMC技术对RPC各龄期和不同水胶比下强度的影响．试验结果表明，EMC技术的使用使RPC的流动度降低，且使高效减水剂的最佳掺量也稍有降低，使用萘系减水剂更为明显；另一方面，使用EMC技术后，RPC的1d的抗压和抗折强度分别提高了103．4％和27．2％，28d则分别提高了25．1％和36．6％；同时EMC技术降低了强度对各种因素如水胶比大小等的敏感性．

Abstract:In the numerical simulation of injection molding,fluidity S is a key parameter to couple with perssure equation and energy equation in the solution of pressure and temperature fields.Basing on the filling principle of non-elastic,non-Newtonian and non