Geomorphological surfaces of different age and origin in granite landscapes: an evaluation of the Schmidt hammer test     

Kerstin Ericson 《地球表面变化过程与地形》2004,29(4):495-509

Granite landforms in Sierra Nevada, California, and the southern part of Sweden were used to test whether a Schmidt hammer can be used to distinguish surfaces of different age and origin. Based on 3260 readings, statistically signi?cant differences were obtained from surfaces formed and/or affected by different geomorphological processes. Aeolian, ?uvial or glacially polished surfaces yield higher values than surfaces exposed to surface weathering, which are distinguishable from surfaces at a weathering front caused by deep weathering. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

深圳某电厂H型钢桩沉桩与效果测试     

艾传井 《工程地质学报》2002,10(3):284-287

在上部为花岗岩块石填土、下部为相对软弱的粘性土 ,地下水与海水相通的地区进行大型工程建设 ,主要建 (构 )筑物采用桩基础是安全可靠的措施 ,但采用何种桩型、沉桩时怎样才能顺利穿过花岗岩块石填土是一个值得研究的课题。采用潜孔锤引孔穿过花岗岩块石填土 ,往孔内回填碎石 ,然后打H型钢桩 ,在深圳某电厂地基处理中获得了较好的效果  相似文献   

横波激发新技术   总被引：5，自引：0，他引：5  

张树林  朱介寿 《地球科学进展》1991,6(1):49-53

横波地震是深入认识沉积岩性、岩相的具有发展前途的崭新方法和手段。根据国外资料,对横波激发新技术中的三孔法、水平重锤法、SHOVER法与横波振动器作了介绍与比较。  相似文献   

Enhanced bedrock weathering in association with late-lying snowpatches: Evidence from Livingston Island,Antarctica     

Kevin Hall 《地球表面变化过程与地形》1993,18(2):121-129

An indication of the extent of weathering on different aspects of rock outcrops on Livingston Island, Antarctica, was obtained by means of a Schmidt hammer, a cone indenter and measurement of weathering rind thickness. Results show that weathering, particularly chemical weathering, is enhanced on the lee side of outcrops where snow accumulates as a result of prolonged wetting by the melting snow. Rock moisture and temperature data indicate that the south-facing, snow-accumulation side of obstacles have high rock moisture levels and maintain relatively high temperatures. Whilst chemical weathering is greater on the leeward side of outcrops, mechanical processes are greater on the windward side. The presence of late-lying snow thus appears to exert a strong influence on weathering.  相似文献   

用集束潜孔锤做硬岩连续墙开槽机          下载免费PDF全文

刘广志 《探矿工程》1994,(4):6-8

介绍了英格素兰公司的集束式潜孔锤的特点及性能，用集束潜孔锤施工３种不同结构连续墙的程序，着重介绍了钢板连续墙施工工序。  相似文献   

Comments on Allison's (1990) developments in a non-destructive method of determining rock strength     

Ian A. Campbell 《地球表面变化过程与地形》1991,16(5):471-472

In Developments in a non-destructive method of determining rock strength, Allison (1990) compares data collected using an ultrasonic apparatus with data obtained from Schmidt hammer tests. He concludes that the Schmidt hammer data shows a wide degree of scatter and that its accuracy as field technique is questionable. No discussion is made of how the Schmidt hammer was used or of the total number of readings taken and the range of values. The graphs presented comparing data derived from some samples using ultrasonic equipment do not appear markedly at variance from the Schmidt hammer-derived data but true comparison is not possible because the graphs use different measurement criteria. No information is given on comparative time and financial costs, which must be significantly different for the two techniques.  相似文献   

Measurement and calibration of weathering using the schmidt hammer,on wave washed moraines on the upper norrland coast,Sweden     

R. Sjberg  N. Broadbent 《地球表面变化过程与地形》1991,16(1):57-64

The Schmidt hammer has for some years been used to measure the hardness of different rock surfaces and to date relatively boulders in moraine deposits. In this paper applications on isostatically raised boulder-beaches and rocky shores are described. The research area is the northern Swedish Bothnian coast where present isostatic uplift is between 0.8-1.0 cm year^?1. Elevations above sea-level can be converted to a timescale. Rebound values (R) of the Schmidt hammer are correlated with the altitude and the degree of rock weathering can be estimated for each site. Eight sites with boulder-beaches and nine sites with rocky shores have been analysed. For boulder-beaches correlation-coefficients of 0.82-0.97 for weathering values (R) and the elevations above sea-level were obtained. For the rocky shores these values were calculated to 0.75-0.97. This method has applications in both geomorphology and archaeology. For example, a deep layer of weathered dolerite in the Nordingrå region, which previously has been regarded as a post-Weichselian formation, can be shown to be of pre-Weichselian origin. Several archaeological applications are also mentioned in the paper.  相似文献   

振动锤下钢护筒气举反循环清孔旋挖钻孔施工技术          下载免费PDF全文

陈雪峰  孙金柱 《探矿工程》2019,46(1):73-76

以江西省九江地区的德安集贸市场桩基工程为例,介绍了振动锤下钢护筒配套气举反循环清孔旋挖钻孔灌注桩施工技术应用情况及成桩关键技术措施。旋挖钻机在桩基工程施工中的成孔效率高,但在松散地层及容易坍塌地层中施工存在沉渣控制较为困难的问题,因此解决好该工程沉渣满足设计要求,是项目成功的关键所在。实践证明,采用振动锤下钢护筒隔离松散地层和容易坍塌地层以及气举反循环清孔相结合的措施,可彻底解决孔底沉渣过大的问题。  相似文献   

射流冲击器水平井段试验及失效分析          下载免费PDF全文

索忠伟 《探矿工程》2019,46(6):59-63

为了解决油气钻井水平井硬地层可钻性差、钻速慢的问题,同时减小水平井段滑动钻进中出现托压的现象,提高钻井效率,通过对工具原理进行分析,对结构及参数进行改进,研制出了适于水平井段的射流式冲击器,并在台架试验的基础上,进一步优化了性能参数、钻具组合及旋冲钻井参数,并开展了水平井段现场试验应用。现场试验结果表明,在水平井段采用射流式冲击器提速效果显著,具有深入研究的价值。但冲击器在水平井段失效问题影响了其提速效果,本文对其存在的问题进行了理论及试验分析并提出了改进方案。  相似文献   

潜孔锤同心跟管钻具零件强度分析与研究     

赵大军  吴晓寒  徐龙宪  于萍  计胜利 《煤田地质与勘探》2006,34(1):79-80

介绍了适合卵砾石地层地震勘探孔施工用的潜孔锤同心跟管钻具的结构和工作原理。针对钻具使用中出现的套管螺纹和内外钻头冲击面强度低、寿命短的问题,采用有限元方法对钻具的零件进行了强度分析,并提出了提高套管螺纹和内外钻头寿命的方法。   相似文献