Researching on the technology if reverse order is to study strains if pits, structural systems if basement, environmental surwey and underpinnings. on account of emphasizing developing methods if checking strength if pick - ets, modemizing machenes of excavation and studying methods of underpinning is put forward and is a way if controlling the quality of pickets in sites, which leads an active effect ; synthetic application if rankintheory, spatial and time effect theory to excavation tl aanalyze the state of soil force and strain is brought forward and the time effect should be considered in the zone of clay, the formation and development of soil plasticity are analyzed and the most dangerous zone to decide how to excavate and where to begin is found ; analyzing the cause of picket settlement during reverse order and the differential settlement and discussing hlw to solute it. duringh the temporary survey and the environmental warship, bringing rorward the theory of environmental vibration and analyzing the state of soil force and probability of losing stabilization of soil under the effect of environmental vibration ; analyzing the state offeree in underground concrete wall by the method of mathematics and pointing out the place of the maximum force and deformation. based on systematic illustrating the reverse order, problems about application and development of reverse order and suggestions also are expressed
鑒于國內外的研究把重點放在大力發展工程樁的實驗室承載力監測方法與設備、如何使
土方開挖機械現代化及對周圍建築的臨測方法上,本文提出了現場利用聲波層析成像技術監測鋼砼樁內部質量的方法與程序,並得出了聲波層析成像技術是砼樁的動態質量檢測的有效手段,這對指導施有積極、現實意義;提出了綜合運用朗
肯土壓力理論、基坑空間和時間效應影響理論來分析逆作法施工過程中基坑邊坡
土體應力及應變的變化情況,指出粘
土地區也應考慮時間效應,並且進一步分析了基坑邊坡
土體的塑性區形成和發展,找出邊坡最不利的區域,以確定地下室
土體的挖掘的方式和順序,指出憑主觀臆斷與經驗來施工是不可取的;在分析、經較逆作法與大開挖順作法的地下室結構體系受力情況及施工順序的不同,提出了節點處理技術;分析了逆作法施工期間樁的沉降變化原因及由此而產生的差異,並探討了解決的方法;本文還提出了環境振動對
土體邊坡穩定產生影響的觀點,並分析了在環境振動影響下,
土體的應力狀態及
土休失穩破壞概率,並且還運用彈性力學知識和數學分析的方法定量地分析了地下混凝
土墻受力狀態,指出了被監測墻體的最大應力、應變位置。
The famous smp ( matsuoka - nakai ) strength criterion in the three - dimensional stress state is brought into the formulas of the rakine soil pressure and the new formulas is proposed in the three - dimensional stress state in this paper
本文將著名的三維應力狀態下的smp (松崗?中井)強度準則應用到朗
肯土壓力計算公式中去,推導了三維應力狀態下的朗
肯土壓力計算公式。
On this basis, regarding the rankine soil pressure theory as the prerequisite, the active earth pressure formula considering the deformation of braced structure has been set up. the calculation of active limit displacement in the formula has been researched, and proposes two methods ; all of which are applied to active soil pressure formula considering the deformation of braced structure. further, combine the project example, the active earth pressure formula considering the deformation of braced structure has been tested and confirmed its rationality
本文介紹了基坑支護結構的形式、特點,以及目前工程中基坑的設計計算方法,分析了
土壓力的計算在基坑工程設計計算中的重要性;通過實測的基坑主動
土壓力與支護結構位移的分析得出基坑主動
土壓力與位移之間存在密切關系,在此基礎上以朗
肯土壓力理論為前提建立了考慮基坑支護結構位移的主動區
土壓力公式;並對公式中的主動極限位移的計算做了研究,提出了主動極限位移的兩種計算方法;把這兩種方法都運用於考慮支護結構位移的主動
土壓力計算公式,進而結合工程實例,對考慮支護結構位移的主動
土壓力公式進行了驗證,驗證了公式的合理性。
At the same time, based on the theory of rankine ' s earth pressure, several kinds of reasonable formulae about water and earth pressures are put forward. combined several practical foundation pit engineerings these equations are calculated according to the shear strength parameters of uu and cu test
同時,文章以朗
肯土壓力理論為基礎找出了水
土壓力合算和分算的幾種合理的計算方法,並利用實際算例根據試驗所得的抗剪強度指標對這幾種
土壓力計算方法進行了比較和分析。
The rankine soil pressure theory is always accepted as the foundation of calculations of the soil pressure in practice. but as we know, the ignorance of the middle principal stress and the utility of mohr - coulomb strength criterion in the two - dimensional stress state make a blemish that the active soil pressure is bigger and the passive soil pressure is litter than the real
朗
肯土壓力計算公式一直是工程實際
土壓力計算的理論基礎,但是朗
肯土壓力計算公式在推導過程中忽略了中主應力的影響,仍然應用二維應力狀態下的莫爾?庫侖強度準則,致使計算出的主動
土壓力偏大而被動
土壓力偏小。
Based on the summary of the famous strength criterions or strength envelope models in last century, smp ( matsuoka - nakai ) strength criterion which is wildly used in soil mechanics is briefly introduced and then brought into the practical calculations in geotechnical engineering in this paper, namely this famous three - dimensional strength criterion is used to modify the classic rankine soil pressure theory and the formulas of the critical edge load and the critical load
本文在綜述了上世紀一些著名的破壞準則和強度包線模型的基礎上,簡單介紹了在土力學中有廣泛應用的smp (松崗?中井)破壞準則,將這一著名的土體三維破壞準則應用於巖土工程實際計算(土壓力計算和地基承載力計算)中,即運用smp (松崗?中井)破壞準則修正了經典的朗肯土壓力計算公式和臨塑荷載、臨界荷載計算公式。