高填方路基稳定性的几点思考

本文结合实际情况,在分析工程概况及工程地质条件的基础上,分析了填方路基失稳类型,通过反演方法进行了高填方路基填料的抗剪强度参数计算,并进行了高填方路基监测,说明了路基稳定控制的可行性。     

Failure of a geomembrane lined embankment dam – Case study

The right wing embankment of the headrace channel of a hydropower plant, failed adjacent to the concrete intake structure. The failure also caused damages of the penstocks and flooding of the powerhouse.     

路堤荷载下双向增强复合地基荷载分担比及沉降计算

针对路堤荷载下双向增强复合地基受力变形特性,以单桩有效影响范围内的路堤与复合地基为分析对象,引入大挠度环形薄板考虑加筋垫层的“柔性筏板效应”与“拉膜效应”,同时通过假定桩土相对位移模式,考虑地基成层性,从而建立了路堤、水平加筋体、桩体、桩间土协调变形三维模型,获得了路堤荷载作用下双向增强复合地基的荷载分担比及沉降计算方法。采用某工程试验数据对该计算方法进行验证,同时分析了路堤高度、桩帽宽度、筋材抗拉模量对中性点位置、桩土差异沉降以及复合薄板中面最大拉应力的影响,结果表明该方法所求得的荷载分担比及沉降与实测值较为接近,证明了其合理性。     

Experimental analysis on settlement controlling of geogrid-reinforced pile-supported embankments on collapsible loess in high-speed railway

Centrifugal model tests were performed to investigate the effectiveness of settlement control using geogrid-reinforced pile-supported embankments for high-speed railways on collapsible loess. First, the acceptability of using remoulded loess to simulate the behaviour of undisturbed collapsible loess in wetting test was examined in centrifuge tests. Then, the settlement of geogrid-reinforced pile-supported embankments under different conditions was investigated using remoulded loess. Experiments results showed that the collapse deformation process of remoulded and undisturbed collapsible loess can be divided into three stages with respect to time. The settlement of embankment built on collapsible loess foundation without improvement does not meet the post-construction settlement constraint for embankment of ballast track high-speed railways. Use of rigid piles, with or without caps, can significantly reduce embankment settlement and the rate of post-construction settlement. It was also observed that the negative skin friction developed in the piles varies with pile spacing and the pile configurations.     

波浪作用下防滑预制块护坡爬高消能模型试验

传统光面预制块护坡因其稳定、耐久、适应性强而被广泛使用,但在涉坡安全及爬高消浪方面仍存在不足。对此提出一种防滑预制块护坡,在介绍护坡结构功能的基础上,通过室内物理模型试验对比传统光面预制块护坡及防滑预制块护坡的爬高消能效果。结果表明,与传统光面预制块护坡相比,防滑预制块护坡增设的图形条纹能有效降低涉坡人员伤亡,且护坡效果较好,平均波浪爬高降低约9%,消浪效果达14%以上,具有较好的市场应用前景。     

均质土坝渗流场与应力场耦合分析的数学模型

从均质土坝的渗透特性出发，分析了均质土坝渗流场与应力场相互作用的力学机制，提出了均质土坝渗流场与应力场耦合分析的连续介质数学模型，并讨论了该数学模型的有限元数值解法。     

61m高楼定向爆破拆除

论述了在临近长江堤防的条件下,定向爆破拆除1座17层高61 m的框架剪力墙结构大楼的情况.通过预处理、开挖多条减振沟、用柔性材料铺缓冲垫层等防范措施,该复杂环境中高楼控制爆破拆除取得成功.     

综合防护技术在高填方路堤中的应用

本文结合某大型水泥厂区工程实例,论述了基础换填、强夯结合碾压以及加筋土植草等技术在该高填方路堤边坡的综合运用,重点阐述了强夯的信息化施工管理及其振动对既有建筑的影响,对同类工程具有借鉴意义。     

土石混填路基填筑施工工艺

对振动碾压机械的影响深度进行了分析,从压实效率和压路机选型两方面阐述了振动碾的选择方法,并简要介绍了土石混合料填筑施工工艺,指出合理选择压实方式和配置使用压实机械是保证土石混填路基质量的关键。     

低山深丘区预制梁场的选择

结合广元至南充高速公路预制梁场场址及建场方案的选择,对预制梁场几种方案从安全、经济、环保水保等方面作分析比较,从而确定了经济实用的最佳方案。