上海地区钻孔降水头注水试验公式应用探讨

对上海市《岩土工程勘察规范》钻孔降水头注水试验计算公式应用条件进行了分析,给出了不同条件下钻孔降水头注水试验计算公式的表达式。通过工程实例,对不同条件计算结果的影响程度进行了分析比较,并提出了应用建议。     

芒果嫁接成活气象条件及生产管理措施

利用芒果嫁接成活率多年分期物候观测以及同期的气象观测实况资料进行统计分析。结果表明,芒果嫁接成活率与嫁接后的接口愈合期气温成显著正相关,与光照、降水量、空气相对湿度相关不明显。建立了芒果嫁接成活率与嫁接后6天平均气温、最高气温回归方程,影响芒果嫁接成活的主要气象要素是日均温。个例分析表明芒果嫁接成活关键期即嫁接穗生理脆弱的接口愈合期,气温偏低或异常高温天气对芒果嫁接成活不利影响极大。讨论了依气象条件提高嫁接成活率注意事项,提出了相应的生产管理措施。     

A new parabolic variational inequality formulation of Signorini's condition for non‐steady seepage problems with complex seepage control systems

By extending Darcy's law to the dry domain above the free surface and specifying the boundary condition on the potential seepage surfaces as Signorini's type, a partial differential equation (PDE) defined in the entire domain of interest is formulated for non‐steady seepage flow problems with free surfaces. A new parabolic variational inequality (PVI) formulation equivalent to the PDE formulation is then proposed, in which the flux part of the complementary condition of Signorini's type in the PDE formulation is transformed into natural boundary condition. Consequently, the singularity at the seepage points is eliminated and the difficulty in selecting the trial functions is significantly reduced. By introducing an adaptive penalized Heaviside function in the finite element analysis, the numerical stability of the discrete PVI formulation is well guaranteed. The proposed approach is validated by the existing laboratory tests with sudden rise and dropdown of water heads, and then applied to capture the non‐steady seepage flow behaviors in a homogeneous rectangular dam with five drainage tunnels during a linear dropdown of upstream water head. The non‐steady seepage flow in the surrounding rocks of the underground powerhouse in the Shuibuya Hydropower Project is further modeled, in which a complex seepage control system is involved. Comparisons with the in situ monitoring data show that the calculation results well illustrate the non‐steady seepage flow process during impounding and the operation of the reservoir as well as the seepage control effects of the drainage hole arrays and drainage tunnels. Copyright © 2010 John Wiley & Sons, Ltd.     

A study on one‐dimensional consolidation of layered structured soils

The governing equations for one‐dimensional consolidation of layered structured soils under time‐dependent loading are established. Using simplified k‐σ′ and m_v‐σ′ models, n‐layered structured soils are transformed into (n + 1) or (n + 2)‐layered soils in which the thickness of upper and lower layers are gradually changing. The approximate solutions for the governing equations are then obtained under two types of boundary conditions, and the computer program is developed. Based on the solutions and computer program, the consolidation behavior of layered structured soils with soft interlayer is studied. It is shown that the permeability and compressibility of the soft interlayer have the greatest influences on the rate of settlement and rate of the dissipation of excess pore water pressure. Copyright © 2015 John Wiley & Sons, Ltd.     

新集矿区推覆构造对开采地质条件的影响

通过对采、探资料的对比研究，指出了推覆构造在一定程度上影响着煤系断层的展布，砂岩的岩石质量指标与该砂岩距推覆构造底界面的距离呈对数关系。推覆构造不同单元的水文地质条件相差很大，煤层顶板易冒落块体与推覆构造有一定关系，推覆构造对地表沉降具有一定的减缓作用。     

江西滑石矿成矿条件及成因分析

通过对长丰、禾源两滑石特征的介绍，分析了滑石矿的成矿地质条件，探讨了该区滑石矿的成因类型。     

下边界条件为水位流量关系的扩散波洪水演算方法研究

经大量的理论分析和实际洪水演算表明,扩散波可较好地反映洪水波的运动特点。本文基于河道下断面的水位流量关系和连续方程的联立求解,导出了水位流量关系型的下边界条件。利用Laplace变换,得到了扩散波方程在该边界条件下的解析解。文中的求解过程表明,可利用该法进行洪水演算,关键在于如何与实际洪水结合,这个问题有待进一步地分析研究。     

Generation and Evolution of Ore Fluids for Porphyry Cu-Au Mineralization of the Santo Tomas II (Philex) Deposit, Philippines

Abstract: The Santo Tomas II (Philex) deposit is a porphyry Cu‐Au deposit, located in the southern part of the Baguio mineral district, Benguet Province, northern Luzon, Philippines. The Santo Tomas II deposit is associated with an intrusive complex consisting of four rock types that are distinguished based on petrography. They are 1) post‐ore clinopyroxene‐bearing hornblende andesite porphyry, 2) ore‐generating hornblende andesite porphyry, 3) hornblende quartz diorite porphyry and 4) porphyritic hornblende quartz diorite. K‐Ar age of hydrothermal biotitization was estimated to be 1.5±0.4 Ma. A number of intrusive bodies having broadly similar petrography and K‐Ar age occur in the vicinity of the Santo Tomas II deposit, such as at Clifton, Ligay (Binang), Bumolo (Waterhole) and Philex Main Camp areas. The intrusions at the Santo Tomas II deposit and in the vicinity are characterized by high X_Mg (Mg/[Mg+Fe] atomic ratio, about 0.7 or higher) of mafic silicate phenocrysts such as hornblende, and high sulfur contents (> 0.2 wt% as SO₃) in accessory microphenocrystic apatite, suggesting a highly oxidizing condition. Sulfur is accommodated dominantly as oxidized species since the crystallization of phe‐nocrysts. Sub‐dendritic rim of tremolitic amphibole on hornblende phenocryst in the ore‐generating andesite porphyry at the Santo Tomas II deposit suggests interaction of magma and aqueous fluid(s) exsolved due to decompression during intrusion. Dissemination of magnetite is associated with hydrothermal biotitization and is followed by sheeted and stockwork quartz veinlets having silician magnetite and rare titanohematite instead of Cu‐Fe sulfides. The silician magnetite‐rich quartz veinlet was formed at f_O2 near the hematite‐magnetite buffer at nearly magmatic temperature, where sulfur dominantly existed as oxidized species such as SO₂. Chalcopyrite and bornite, which commonly exhibit micrographic texture often accompanying Pd telluride and native gold/Au‐rich electrum, are associated with subsequent anhydrite (‐quartz) veinlets and stringers. Both intermediate solid solution (iss) and bornite solid solution (bnss) are thought to have coprecipitated primarily at above 500°C based on fluid inclusion microthermometry and sulfur isotope thermometry applied for anhydrite and associated chal‐copyrite and bornite. The initial iss is considered to have converted to chalcopyrite partly replacing bnss during cooling. The hypersaline polyphase fluid inclusions abundantly found in the sheeted and stockwork quartz as well as anhydrite veinlets with scarce gaseous inclusions suggest that they have been trapped in the two aqueous fluid immiscible region. The western Luzon arc associated with porphyry Cu mineralization is characterized by oxidized hydrous magmatism and shallow emplacement, and by the source of sulfur enriched in ³⁴S.     

北京地区东西向构造带对金矿化的有利条件分析

东西向构造带是北京地区一条主要的金矿化带，本文在1／5万区域地质调查及曹碾沟－上窝铺－带金矿普查的基础上，以北干沟金矿化点为例，对该构造带的演化及其对金矿化形成的有利条件进行了初步分析。     

地下流体数字化观测条件和技术研究

在新疆现有仪器设备基础上，结合“九五”流体台网数字化技术改造要求，在不同观测点、不同观测条件下，利用不同方法对水温、压力、水氡、气氡、氦和断层土壤气氡等测项开展了多项对比观测实践验，找出 了稳定可靠、反应灵敏、信息量大、适用野外自动化观测的观测条件和方法。