中朝地台东北缘地区的地震层析成像

Based on 38?000 P wave arrival times recorded during the period of 1980 to 1997 in the northeast margin area of Sino Korean platform （117°00′\126°00′E, 36°00′\44°00′N） the 3D velocity structures of the crust and upper mantle have been reconstructed by using orthogonal projection. The tomography results have been proved to be reliable by analyzing and comparing in detail the results with the deep seismic prospecting profiles. It is shown that there exists obvious lateral inhomogeneity in the medium of the crust and upper mantle which is still distinct even at the 120km depth in the northeast margin area of Sino Korean platform. It is reflected clearly in the velocity image of the upper crust that the distribution of all kinds of rock elements corresponds to that of rocks with different nature in this area. Several lower velocity anomaly regions （i.e. regions with velocity reversed layer） have been discovered in the studied area from the velocity images of upper and middle crust, such as Haicheng, Chaoyang?Yixian, south of Dandong, Tangshan etc., among which the lower velocity layers in Haicheng, Tangshan, Chaoyang have also been proved by the deep seismic sounding data. In the area several strong continental earthquakes all happened in crispy medium with higher velocity above lower velocity layers in the crust, whereas in Bohai sea all strong earthquakes happened in positions where the medium velocity changes abruptly and clearly in horizontal. At different depth, Pulandian Shanhaiguan lower velocity anomaly zone across Bohai sea with strike NW has been found. Comparison of the velocity images obtained from 2D seismic tomography with that from deep seismic sounding data, we can consider to gain similar effect with deep seismic sounding by taking advantage of seismic tomography under certain condition in this area.     

杭州绕城高速公路软基处理试验的现场研究

对杭州绕城高速公路软基处理进行了现场试验研究，包括土性参数的确定，原位表面沉降观测，分层沉降观测，水平位移观测和孔隙水压力观测，试验结果对设计和施工有重要的指导意义。     

控制水污染的有效途径：污染物排放总量控制

一、前 言 实施污染物总量控制,对控制水体污染,确保水环境质量具有重要意义。 所谓污染物排放总量控制(简称总量控制)是指在环境污染严量的地区(或流域),或即将成为严重污染的地区(或流域)内,为确保环境目标,根据该地区(或流域)的实况,定出相应的环境允许量,然后通过技术、经济可行性分析和优化方案比较,确定各排污单位的污染物允许排放量,进行有效的排污控制。区域环境允许量的确定,可以用水质标准为基点反推,即按水体功能及环境允许量确定污染物     

浅谈1∶5万水系沉积物测量在藏东资源大调查中的应用——以芒康盐井为例

芒康县盐井属于西藏东部昌都地区,地处著名的三江成矿区。由于三江地区地形切割强烈,水系发育,采用1:5万水系沉积物测量地球化学勘查方法,在藏东矿产资源预查中取得了新的突破,为进一步勘查工作提供了丰富的地球化学资料和可靠的依据。     

西藏谢通门县吉拉铜金矿矿床地质特征及找矿前景分析

吉拉铜金矿位于冈底斯成矿带中段南缘,谢通门铜金富铁矿集区,与著名的雄村特大型铜金矿毗邻,成矿条件优越,化探异常显示Cu、Au、Pb、Zn、Ag元素标准差、变化系数大,富集能力强,元素套叠好,异常浓集中心突出,浓集中心与矿化（体）相对应,属典型的致矿异常,矿（化）体分布与大理岩和闪长岩接触带上。建议应以冈底斯成矿带铜多金属矿成矿找矿模式及雄村矿床的发现经验来指导找矿,继续加强勘查和研究工作,将有望实现斑岩型、矽卡岩型铜多金属矿,韧性剪切带型、蚀变岩性金铜矿的重大找矿突破。     

浅层折射波人工地震勘探模拟资料的数字化处理与研究

将“ＳＳＤＰＳ”应用于浅层地震勘探，在实践中得出标准化浅层地震资料数字比系统。对每种仪器都必须设计相应的接口电路以连接数据采集卡，对采样间隔、采样长度、数字滤波窗口科学地选取，并提出“相对坐标”的点位确定方法。经应用证明：经数字滤波的数字化记录有效压制了干扰，波组特征明显，连续性好，断层明显，提高了效率，减少了误差，提高了资料解释精度。     

围护桩嵌固深度与基坑稳定性研究

因深基坑围护结构失稳造成的工程事故数见不鲜,而地层差异性是导致基坑围护失稳的主要原因之一.采用数值模拟和工程监测的方法讨论了黏土夹碎石层围护桩嵌固深度问题.分析计算结果得到:在黏土夹碎石层,基坑整体稳定性、坑底抗隆起、墙底抗隆起、抗倾覆稳定性系数以及最大沉降量随着围护桩嵌固深度的增加呈非线性增大的趋势,对比分析现场监测...