许可项目：测绘服务，建设工程勘察，建设工程设计，建设工程监理，建筑物拆除作业（爆破作业除外），矿产资源勘查，地质灾害治理工程施工，地质灾害危险性评估，地质灾害治理工程勘查，地质灾害治理工程设计，技术进出口，房屋建筑和市政基础设施项目工程总承包，各类工程建设活动，道路货物运输（网络货运），检验检测服务（依法须经批准的项目，经相关部门批准后方可开展经营活动，具体经营项目以审批结果为准）一般项目：土石方工程施工，地质灾害治理服务，建筑工程用机械销售，建筑工程机械与设备租赁，园林绿化工程施工，建筑材料销售（除依法须经批准的项目外，凭营业执照依法自主开展经营活动）
Considering the uncertainty associated with structural boundary conditions, a method for modifying the boundary constraint static model of beam structures was proposed based on the homotopy stochastic finite element method. The overall modification of both the beam body elements and boundary elements was achieved using uncertain static measurement data. By employing the static condensation method, computational degrees of freedom were ensured to match measured degrees of freedom. Regularization methods were applied to mitigate ill-conditioned solutions in modification equations for stochastic models. The probabilistic residual minimization method enables optimal selection of homotopy coefficients, ensured accurate identification of boundary constraints and precise overall modification. Finally, simulations on variable-section concrete beams and static loading tests on aluminum alloy beams were conducted to verify the effectiveness of this approach.
Purposes To achieve the reuse of solid waste, the feasibility of using compacted tailings-bentonite material as an impermeable material for landfill cover system is explored in this study. The maximum dry density values of tailings-bentonite mixtures with varying bentonite contents are determined through compaction tests. Methods Saturated permeability coefficients of the tailings-bentonite mixtures were measured by using a consolidation permeameter. Additionally, the pore characteristics of the samples were analyzed through mercury intrusion porosimetry and scanning electron microscopy tests. Finally, the service performance of compacted tailings-bentonite mixture in cover systems was investigated by using numerical simulations. Findings The results reveal that the maximum dry density of the tailings-bentonite mixture first increases and then decreases with increasing bentonite content, reaching the maximum of 1.94 g/cm3 at 10% bentonite content. The permeability coefficient of the compacted tailings-bentonite mixture decreases with the increase of bentonite content. A bentonite content of 10% or higher satisfies the permeability requirement for the impermeable layer, i.e., ks=5.61×10-10 m/s, ≤10-9 m/s; in this case, an impermeable layer with a thickness of 10 cm meets the requirement that annual percolation ≤30 mm. Additionally, setting a certain slope to facilitate lateral drainage can effectively reduce the percolation through landfill cover system.
