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首頁(yè)> 外文學(xué)位 >Engineering geology considerations for realignment of Interstate 70/76 across the landslide at New Baltimore, Somerset County, SW Pennsylvania .
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Engineering geology considerations for realignment of Interstate 70/76 across the landslide at New Baltimore, Somerset County, SW Pennsylvania .

機(jī)譯：在賓夕法尼亞州西南部薩默塞特縣新巴爾的摩，通過(guò)滑坡重新排列70/76號(hào)州際公路的工程地質(zhì)考慮。

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摘要

The Pennsylvania Turnpike Commission plans to widen I-76 due to increased traffic in the Somerset County. The New Baltimore landslide, which has caused serious problems for the turnpike since its construction in 1939, is located within this area. The landslide extends 2000 feet (610 m) upslope and 1000 feet (305 m) laterally, and moves 5 to 10 inches (13 to 25 cm) per year. The Turnpike Commission plans to cut into the slope between mile markers 128 and 129 on the south side of the turnpike, thereby passing through the New Baltimore landslide. When the Pennsylvanian Turnpike is realigned, there could be new instability, reactivating the landslide and adding to instability. The bedrock geology of the New Baltimore landslide site consists of the Upper Devonian Catskill Formation which contains interbedded sequences of harder and softer strata including siltstone, shale, and grayish red sandstone units.;This research project was conducted to determine the engineering properties of rocks and stability of the slope located between the mile markers mentioned above. A subsurface investigation was conducted on the New Baltimore landslide by the American Geotechnical and Environmental Services, Inc. of Pennsylvania. Field work was conducted to find the upper limit of the landslide and to collect discontinuity data. The discontinuity data were analyzed to evaluate various modes of slope failure. Lab work conducted in this study included the dry density test, slake durability test, unconfined compression test, and the shear strength test. The results of the study show that slake durability index of the claystone units ranges from 72 to 99% whereas the unconfined compressive strength of the sandstone/siltstone units ranges from 8,900 to 25,600 psi (61.4 to 176.5 MPa). Direct shear test results show that the claystone has a cohesion of 28,455 psf (1362 kPa) and a friction angle of 17 degrees.;The inclinometer data shows that there is small movement along the weaker claystone units (where gouge was encountered during drilling) and this is being closely monitored. Stability analysis indicates that the factor of safety for a dry slope is 1.1 and for a wet slope it is 0.4 with a average pore pressure 546 psf (26 kPa). Selected remedial measures are proposed for the New Baltimore landslide so that the interstate highway can be realigned safely.
機(jī)譯：賓夕法尼亞州收費(fèi)公路委員會(huì)計(jì)劃由于薩默塞特郡的交通增加而擴(kuò)大I-76公路。自1939年建造以來(lái)，新巴爾的摩滑坡就一直對(duì)收費(fèi)公路造成嚴(yán)重問(wèn)題，它位于該地區(qū)?；孪蛏涎由?000英尺（610 m），橫向延伸1000英尺（305 m），每年移動(dòng)5至10英寸（13至25 cm）。收費(fèi)公路委員會(huì)計(jì)劃在收費(fèi)公路南側(cè)切入英里標(biāo)記128和129之間的坡度，從而穿過(guò)新巴爾的摩滑坡。重新調(diào)整賓夕法尼亞州收費(fèi)公路時(shí)，可能會(huì)出現(xiàn)新的不穩(wěn)定狀況，重新激活滑坡并增加不穩(wěn)定狀況。新巴爾的摩滑坡場(chǎng)的基巖地質(zhì)學(xué)由上泥盆統(tǒng)卡茨基爾組組成，其中包括粉砂巖，頁(yè)巖和灰紅色砂巖單元等較硬和較軟的地層的層序序列;該研究項(xiàng)目旨在確定巖石和巖石的工程特性。位于上述英里標(biāo)記之間的斜坡的穩(wěn)定性。賓夕法尼亞州的美國(guó)巖土工程與環(huán)境服務(wù)公司對(duì)新巴爾的摩滑坡進(jìn)行了地下調(diào)查。進(jìn)行了現(xiàn)場(chǎng)工作以找到滑坡的上限并收集不連續(xù)性數(shù)據(jù)。分析了不連續(xù)性數(shù)據(jù)以評(píng)估各種形式的邊坡破壞。這項(xiàng)研究中進(jìn)行的實(shí)驗(yàn)室工作包括干密度測(cè)試，耐久試驗(yàn)，無(wú)邊壓縮測(cè)試和剪切強(qiáng)度測(cè)試。研究結(jié)果表明，粘土巖單元的耐久指數(shù)為72％至99％，而砂巖/粉砂巖單元的無(wú)側(cè)限抗壓強(qiáng)度為8,900至25,600 psi（61.4至176.5 MPa）。直接剪切試驗(yàn)結(jié)果表明，該粘土巖的內(nèi)聚力為28,455 psf（1362 kPa），摩擦角為17度;傾角儀數(shù)據(jù)顯示，沿較弱的粘土巖單元（鉆削過(guò)程中遇到鑿子）有較小的運(yùn)動(dòng);這正在受到密切監(jiān)視。穩(wěn)定性分析表明，在平均孔隙壓力為546 psf（26 kPa）的情況下，干坡的安全系數(shù)為1.1，濕坡的安全系數(shù)為0.4。建議對(duì)新巴爾的摩滑坡采取一些補(bǔ)救措施，以便可以安全地重新調(diào)整州際公路。

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  • 作者

    Nowicki, Lisa A.;

  • 作者單位

    Kent State University.;

  • 授予單位 Kent State University.;
  • 學(xué)科 Engineering Geological.;Engineering Civil.
  • 學(xué)位 M.S.
  • 年度 2011
  • 頁(yè)碼 248 p.
  • 總頁(yè)數(shù) 248
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
  • 關(guān)鍵詞

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