浅埋弃土段大断面隧道施工力学行为研究

以龙洞堡机场隧道为工程背景,对弃土段隧道大变形原因进行深入分析,提出相应的改进措施,使隧道顺利通过剩余弃土段。研究结果表明,隧道所处人工弃土段与经压密原生土体物理性质存在差异,小导管与袖阀管注浆无法在弃土层扩散,反而增加了覆土重度,增大了隧道上覆荷载;实践证明对剩余弃土段采取二重管双液注浆,其效果要明显优于上述两种注浆措施;掌子面预留核心土和掌子面锚杆有效控制了掌子面前方先行位移,剩余弃土段掌子面先行位移约占总位移的15%~18%,达到减少掌子面先行位移的目的;弃土段隧道开挖,上覆土体呈现出整体下沉趋势,通过拱脚注浆锁脚锚杆可以减少初期支护拱脚、边墙脚沉降和过大水平位移;通过数值计算分析表明弧形导坑法开挖时,安全系数最小值发生在隧道仰拱中部,其量值为3.36,初期支护安全系数均大于2.4,支护体系在施工阶段是安全的。     

江苏连云港地区滨海相软土地质特性研究

根据江苏连云港地区大量的工程地质勘察资料，就该区软土层的因类型、物理力学特性、室内试验问题、现场原位测试，特别是力学指标的确定进行了深入的探讨和分析，结果表明：室内试验确定连云港 地区软土力学指标误差大，有些指标与实际误差在2倍以上，常难以气氛。用十字板、CPT方法有较好的效果。     

供热燃煤锅炉清洁生产新工艺

以天津市和河北省某供热中心节能减排改造工程为例,介绍炉内清洁燃烧与炉外烟气净化有机结合的新工艺,达到清洁生产的效果     

Experimental Study of the Distribution of Au and Cu in Aqueous Vapor Phase at High Temperatures and Its Role on Ore-forming Transportation

This study focuses on experiments of Au and Cu dissolved in vapor phase in hydrothermal fluids. Experiments prove that Au and Cu can re-distribute in vapor phase and liquid phase during separation of Au- and Cu-bearing supercritical fluids to vapor and liquid phases. These experimental results can illustrate some ore geneses, where boiling phenomena of ore fluids were found. Au- and Cubearing NaHCO3-HCl solutions were heated up to more than 350℃ in the main vessel, and then passed through a phase separator in a temperature range from 250℃ to 300℃, separated into vapor and liquid phases. We collected and analyzed the liquid and vapor samples separately, and found that Au and Cu dissolved and distributed in vapor phase. In some cases, the concentrations of Au and Cu in vapor are higher than those in liquid phase. Those experiments are used to interpret field observations of fluid inclusion data of some Au and Cu deposits, and demonstrate that some Au and Cu ore deposits are derived from metals transportation in vapor phase.     

井液电阻率法在井管故障探测中的应用

通过对井液电阻率方法与技术的研究和测试仪器的改进,将其运用于井管故障的检测。能简便、快捷、准确地探明井管破损的位置、大小以及由于成井工艺不良而引导的渗漏问题,为修井和故障处理提供了可靠的依据,从而扩大了这种方法的应用领域。     

Trace element geochemistry of Amba Dongar carbonatite complex,India: Evidence for fractional crystallization and silicate-carbonate melt immiscibility

Carbonatites are believed to have crystallized either from mantle-derived primary carbonate magmas or from secondary melts derived from carbonated silicate magmas through liquid immiscibility or from residual melts of fractional crystallization of silicate magmas. Although the observed coexistence of carbonatites and alkaline silicate rocks in most complexes, their coeval emplacement in many, and overlapping initial⁸⁷Sr/⁸⁶Sr and¹⁴³Nd/¹⁴⁴Nd ratios are supportive of their cogenesis; there have been few efforts to devise a quantitative method to identify the magmatic processes. In the present study we have made an attempt to accomplish this by modeling the trace element contents of carbonatites and coeval alkaline silicate rocks of Amba Dongar complex, India. Trace element data suggest that the carbonatites and alkaline silicate rocks of this complex are products of fractional crystallization of two separate parental melts. Using the available silicate melt-carbonate melt partition coefficients for various trace elements, and the observed data from carbonatites, we have tried to simulate trace element distribution pattern for the parental silicate melt. The results of the modeling not only support the hypothesis of silicate-carbonate melt immiscibility for the evolution of Amba Dongar but also establish a procedure to test the above hypothesis in such complexes.     

微管径高效液相色谱及其应用

介绍了微管径高效液相色谱法 (microboreHPLC ,μHPLC)及其应用 ,包括 μHPLC的结构特点、优点及其在制药、生物产品、环境监测和临床药物试验中的应用     

合采油井产量贡献液相色谱监测法

合采油井各生产层段产量贡献是生产管理中的重要参数,现有测试该参数的技术都存在着成本高、精度低等缺陷。根据不同油层芳香烃分布规律,以及反相液相色谱对芳香化合物良好的分离效果,紫外、荧光检测器对芳香化合物检测的高度选择性和灵敏性,建立了合采油进产量贡献芳香烃液相色谱监测技术。实际监测结果与单层采没实践、试油产量和单抽作业结果相符。     

气液包裹体稳定同位素样品制备及与气液相成分联测方法

本方法研制了一套“气液包裹体稳定同位素样品制备与气液相成分分析联测装置”，将包裹体稳定同位素样品制备装置与气相色谱仪连结起来，能在一个样品中测定出包裹体中的碳、氢、氧稳定同位素及气相和液相成分。整套装置性能良好，主要测定项目均能达到规定的技术指标，并满足包裹体测定要求：①δＤ制样及测定结果的标准偏差≤３‰；②δ＾１８Ｏ制样及测定结果的标准偏差≤０．３‰；③δ＾１３Ｃ制样及测定结果的标准偏差≤０．１     

Genesis of Ultramafic Lamprophyres and Carbonatites at Aillik Bay, Labrador: a Consequence of Incipient Lithospheric Thinning beneath the North Atlantic Craton

Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite,damtjernite) and subordinate dolomite-bearing carbonatite withU–Pb perovskite emplacement ages of 590–555 Ma occurin the vicinity of Aillik Bay, coastal Labrador. The ultramaficlamprophyres principally consist of olivine and phlogopite phenocrystsin a carbonate- or clinopyroxene-dominated groundmass. Ti-richprimary garnet (kimzeyite and Ti-andradite) typically occursat the aillikite type locality and is considered diagnosticfor ultramafic lamprophyre–carbonatite suites. Titanianaluminous phlogopite and clinopyroxene, as well as comparativelyAl-enriched but Cr–Mg-poor spinel (Cr-number < 0.85),are compositionally distinct from analogous minerals in kimberlites,orangeites and olivine lamproites, indicating different magmageneses. The Aillik Bay ultramafic lamprophyres and carbonatiteshave variable but overlapping ⁸⁷Sr/⁸⁶Sr_i ratios (0·70369–0·70662)and show a narrow range in initial _Nd (+0·1 to +1·9)implying that they are related to a common type of parentalmagma with variable isotopic characteristics. Aillikite is closestto this primary magma composition in terms of MgO (15–20wt %) and Ni (200–574 ppm) content; the abundant groundmasscarbonate has ¹³C_PDB between –5·7 and –5,similar to primary mantle-derived carbonates, and ¹⁸O_SMOW from9·4 to 11·6. Extensive melting of a garnet peridotitesource region containing carbonate- and phlogopite-rich veinsat 4–7 GPa triggered by enhanced lithospheric extensioncan account for the volatile-bearing, potassic, incompatibleelement enriched and MgO-rich nature of the proto-aillikitemagma. It is argued that low-degree potassic silicate to carbonatiticmelts from upwelling asthenosphere infiltrated the cold baseof the stretched lithosphere and solidified as veins, therebycrystallizing calcite and phlogopite that were not in equilibriumwith peridotite. Continued Late Neoproterozoic lithosphericthinning, with progressive upwelling of the asthenosphere beneatha developing rift branch in this part of the North Atlanticcraton, caused further veining and successive remelting of veinsplus volatile-fluxed melting of the host fertile garnet peridotite,giving rise to long-lasting hybrid ultramafic lamprophyre magmaproduction in conjunction with the break-up of the Rodinia supercontinent.Proto-aillikite magma reached the surface only after coatingthe uppermost mantle conduits with glimmeritic material, whichcaused minor alkali loss. At intrusion level, carbonate separationfrom this aillikite magma resulted in fractionated dolomite-bearingcarbonatites (¹³C_PDB –3·7 to –2·7)and carbonate-poor mela-aillikite residues. Damtjernites maybe explained by liquid exsolution from alkali-rich proto-aillikitemagma batches that moved through previously reaction-lined conduitsat uppermost mantle depths. KEY WORDS: liquid immiscibility; mantle-derived magmas; metasomatism, Sr–Nd isotopes; U–Pb geochronology