- 摘 要
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孫 勇
（喀斯特環(huán)境與地質(zhì)災(zāi)害防治教育部重點(diǎn)實(shí)驗(yàn)室，貴州大學(xué)蔡家關(guān)校區(qū)，貴陽550003）[摘要] 將雙排支護(hù)樁當(dāng)作框架結(jié)構(gòu)考慮，提出了新的m法理論，將坑底以上前后排樁土產(chǎn)生的作用在前排樁坑底以下樁后的土壓力及單排樁坑底以下樁后的土壓力考慮在樁的受力中。雙排樁及單排樁受到的土壓力為位移、排樁凈距和土性指標(biāo)等的函數(shù)。用室內(nèi)模型試驗(yàn)、新的m法理論及雙排樁隨機(jī)有限桿單元法得出：樁項(xiàng)連梁與樁的剛度比達(dá)到一定值時(shí)，再繼續(xù)增加連梁剛度無意義；按照公路鐵路規(guī)范確定的排樁問不相互影響的排樁凈距值偏于保守。跟上部結(jié)構(gòu)一樣，巖土概率法的發(fā)展方向不可逆轉(zhuǎn)。
[關(guān)鍵詞] 雙排支護(hù)樁；支護(hù)機(jī)理；新m法；局部土體的庫侖土壓力；隨機(jī)有限桿單元法Calculation and research of stochastic finite bar element method in double-row retaining piles
Sun Yong
(Key laboratory of Karst Environment and Geological Hazard Prevention of Ministry of Education, Guizhou University, Guiyang 550003, China)Abstract: The double-row retaining piles were considered into aframe construction, and the new m method was proposed. The new m method is that the coordinate origin of front row pile of double-row piles (or the single-row pile) is marked on the bottom of pit, and consider the earth pressure on the back of front-row pile (or single-row pile) below the bottom of pit which is caused by the gravity of soil above the pit bottom into the differential equation of pile. The earth pressure of single-row pile and double-row piles is the function of pile displacement and net distance between the double-row piles and the engineering characters of the soils. Through the model test indoor and the new m method theory and the stochastic finite bar element method, the following conclusions were gained: when the rigidity ratio of the pile and the top girder is not less than some value and continue to increase this rigidity ratio do not have any biggish benefit; the net distance in the bridge criterions between the double-row piles which do not influence each other is some more than the practice. As same as engineering structure, the probability method is the way of development of the remaining pile, which can not be changed.
Keywords: double-row retaining piles; retaining pile's mechanism; the new m method; Coulomb soil-pressure ofpart soil; stochastic finite staff element method
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