JP7145623B2 - Ground frost heaving/subsidence prediction method - Google Patents
Ground frost heaving/subsidence prediction method Download PDFInfo
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Description
本発明は、凍土工法により地盤を凍結する際の地盤の凍上・沈下量を予測する方法に関する。 TECHNICAL FIELD The present invention relates to a method for predicting the amount of frost heaving and subsidence of ground when the ground is frozen by a frozen soil construction method.
従来、地盤の安定化、防水層の形成などを図る防護工として、耐力壁や止水壁を凍土壁によって形成する凍結工法が用いられている（例えば、特許文献１参照）。 BACKGROUND ART Conventionally, as a protective work for stabilizing the ground, forming a waterproof layer, etc., a freezing construction method has been used in which a load-bearing wall or a water cutoff wall is formed from frozen soil walls (see, for example, Patent Document 1).
一方、凍結工法においては、地盤の凍結膨張により、凍土周辺の構造物（建物、地下埋設管、トンネルなど）が変位するおそれがある。このため、鉛直方向の変位量を予測することが重要であり、この予測手法として、戸部・秋元（１９７９）により地表面変位を、ガウス分布曲線を使用した近似式（「三次元凍上変位計算法」と呼ぶ）を用いた手法、有限要素法（ＦＥＭ）解析を用いた手法が多用されている。 On the other hand, in the freezing method, there is a risk that structures (buildings, underground pipes, tunnels, etc.) around the frozen soil will be displaced due to freezing expansion of the ground. For this reason, it is important to predict the amount of displacement in the vertical direction. As a method for this prediction, Tobe and Akimoto (1979) used an approximation formula using a Gaussian distribution curve to calculate ground surface displacement (“three-dimensional frost heave displacement calculation method ) and a method using finite element method (FEM) analysis are frequently used.
しかしながら、一般的に使用されている三次元凍上変位計算法では、凍土をブロック形状にモデル化し、凍上率・沈下率に応じた膨張量・収縮量が地表面に伝達され、地表面変位をガウス分布曲線で表示する。凍土の施工範囲が複数に分かれており、凍結開始時期および終了時期が異なる場合には、任意の施工時期における地表面変位を計算するためには、図１（ａ）に示すように、その施工時期に応じた「未凍土範囲」「凍土範囲」「解凍土範囲」の面積を計算した上でブロック形状で面積等化となるようにモデル化し、さらに地質（凍上・沈下率が異なる地質）に応じてブロックを細分化したのちに、三次元凍上変位計算法を適用する。 However, in the commonly used three-dimensional frost heave displacement calculation method, the frozen soil is modeled in a block shape, and the amount of expansion and contraction according to the rate of frost heave and subsidence is transmitted to the ground surface, and the ground surface displacement is calculated as Gaussian. Display as a distribution curve. When the frozen soil construction range is divided into multiple areas and the freezing start and end times are different, in order to calculate the ground surface displacement at any construction period, as shown in Fig. 1 (a), the construction After calculating the area of "unfrozen soil range", "frozen ground range", and "thawed soil range" according to the season, model it so that the area is equalized in a block shape, and further geological features (geological features with different rates of frost heaving and subsidence). After subdividing the blocks accordingly, the three-dimensional frost heave displacement calculation method is applied.
これにより、従来手法で凍結・解凍の施工順序、つまり各凍土範囲の凍結開始時期および終了時期を検討するためには、施工時期に応じて毎回始めからモデル化が必要となり、多大な手間、時間、労力を要するという問題があった。 As a result, in order to study the order of freezing and thawing, that is, when to start and end freezing for each frozen soil area, it is necessary to create a model from the beginning every time according to the construction period, which requires a great deal of time and effort. , there was a problem that labor is required.
本発明は、上記事情に鑑み、より簡便且つ精度よく、凍土工法により地盤を凍結する際の地盤の凍上・沈下量を予測することを可能にする地盤の凍上・沈下量予測方法を提供することを目的とする。 In view of the above circumstances, the present invention provides a ground frost heave/subsidence amount prediction method that makes it possible to more simply and accurately predict the ground frost heave/subsidence amount when the ground is frozen by the frozen soil construction method. With the goal.
上記の目的を達するために、この発明は以下の手段を提供している。 In order to achieve the above objects, the present invention provides the following means.
本発明の地盤の凍上・沈下量予測方法は、予め施工対象である現場での凍結状態を予測する所定の対象範囲において、凍土の施工区分毎に２次元のブロック形状の２次元での表面積が面積等価となるように凍土をモデル化するとともに、施工区分毎の平均凍上・沈下率を算出する第一の工程と、前記施工区分毎のそれぞれの施工時期に応じて各凍土区分を「未凍土範囲」、「凍土範囲」、「解凍土範囲」に分類する第二の工程と、前記「未凍土範囲」、「凍土範囲」、「解凍土範囲」の分類範囲に応じ、第一の工程で算出した平均凍上・沈下率を選択し、地盤の変位を三次元凍上変位計算法により求める第三の工程とを備えることを特徴とする。
The method for predicting the amount of frost heaving and subsidence of the ground of the present invention is a predetermined target range for predicting the frozen state at the construction site in advance. The first step is to model the frozen soil so that the area is equivalent, and to calculate the average frost heave and subsidence rate for each construction division. In the first step, the and a third step of selecting the calculated average frost heave/subsidence rate and obtaining ground displacement by a three-dimensional frost heave displacement calculation method.
本発明の地盤の凍上・沈下量予測方法においては、予め凍土の施工区分毎にブロック形状で面積等価となるようモデル化し、施工区分毎の平均凍上・沈下率を算出しておくことで、何度でも容易に、凍結・解凍の施工順序を検討することができる。 In the method for predicting the amount of frost heave and subsidence of the ground according to the present invention, a model is created in advance for each construction section of frozen soil so that the area is equivalent in a block shape, and the average frost heave and subsidence rate for each construction section is calculated. You can easily consider the order of freezing and thawing.
さらに、従来の手法では実際の凍土位置から離れた場所でモデル化するのに対し、本発明の地盤の凍上・沈下量予測方法では、実際の凍土位置でブロック形状にモデル化できることから、予測精度の向上を図ることが可能になる。
Furthermore, while the conventional method models a location distant from the actual frozen ground position, the ground frost heave/subsidence amount prediction method of the present invention can model a block shape at the actual frozen ground position. It is possible to improve
以下、図１を参照し、本発明の一実施形態に係る地盤の凍上・沈下量予測方法について説明する。ここで、本実施形態では、凍結工法を用いて地盤を凍結する際の地盤（凍土）の凍上・沈下量を予測する方法に関するものである。 Hereinafter, a ground frost heave/subsidence amount prediction method according to an embodiment of the present invention will be described with reference to FIG. Here, the present embodiment relates to a method of predicting the amount of frost heave/settlement of the ground (frozen soil) when the ground is frozen using the freezing method.
本実施形態の地盤の凍上・沈下量予測方法では、図１（ｂ）に示すように、第一の工程で、予め凍土の施工区分毎にブロック形状で面積等価となるように凍土をモデル化する。また、施工区分毎の平均凍上・沈下率を算出しておく（未凍土の場合は０%）。 In the ground frost heave/subsidence amount prediction method of the present embodiment, as shown in FIG. do. Also, calculate the average frost heave/subsidence rate for each construction section (0% for unfrozen soil).
第二の工程で、施工時期に応じて各凍土区分を「未凍土範囲」、「凍土範囲」、「解凍土範囲」に分類する。 In the second step, each frozen soil classification is classified into "non-frozen soil range", "frozen soil range", and "thawed soil range" according to construction time.
第三の工程で、分類範囲に応じ、第一の工程で算出した平均凍上・沈下率を選択し、地表面変位（地盤の変位、地盤の応力状態）を三次元凍上変位計算法により計算する。 In the third step, the average frost heave/subsidence rate calculated in the first step is selected according to the classification range, and the ground surface displacement (ground displacement, ground stress state) is calculated by the three-dimensional frost heave displacement calculation method. .
本実施形態の地盤の凍上・沈下量予測方法においては、上記の第一から第三の工程の手順で地表面変位（地盤変位）を算出するため、手間のかかる第一の工程の検討を行った後は、凍結・解凍の施工順序を検討する際に、第二、第三の工程を繰り返すだけで簡単に地表面変位を算出することができる。 In the method for predicting the amount of frost heaving and subsidence of the ground according to the present embodiment, since the ground surface displacement (ground displacement) is calculated in the procedure of the first to third steps, the first step, which is time-consuming, is examined. After that, when considering the order of freezing and thawing, the ground surface displacement can be calculated simply by repeating the second and third steps.
よって、本実施形態の地盤の凍上・沈下量予測方法によれば、より簡便且つ精度よく、凍土工法により地盤を凍結する際の地盤の凍上・沈下量を予測することが可能になる。 Therefore, according to the ground frost heave/subsidence amount prediction method of the present embodiment, it is possible to more simply and accurately predict the ground frost heave/subsidence amount when the ground is frozen by the frozen soil construction method.
以上、本発明による地盤の凍上・沈下量予測方法の一実施形態について説明したが、本発明は上記の一実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。 An embodiment of the method for predicting the amount of frost heave and subsidence of ground according to the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the present invention. .
Claims (1)
前記施工区分毎のそれぞれの施工時期に応じて各凍土区分を「未凍土範囲」、「凍土範囲」、「解凍土範囲」に分類する第二の工程と、
前記「未凍土範囲」、「凍土範囲」、「解凍土範囲」の分類範囲に応じ、第一の工程で算出した平均凍上・沈下率を選択し、地盤の変位を三次元凍上変位計算法により求める第三の工程とを備えることを特徴とする地盤の凍上・沈下量予測方法。 Modeling the frozen soil so that the two-dimensional surface area of the two-dimensional block shape is equivalent to the area for each frozen soil construction section in a predetermined target range for predicting the frozen state at the construction site in advance, A first step of calculating the average frost heave/subsidence rate for each construction section;
a second step of classifying each frozen soil classification into "unfrozen soil range", "frozen soil range", and "thawed soil range" according to the construction time of each construction classification;
Select the average frost heave/subsidence rate calculated in the first step according to the classification range of the "unfrozen soil range", "frozen soil range", and "thawed soil range", and calculate the ground displacement by the three-dimensional frost heave displacement calculation method. A method for predicting the amount of frost heaving and subsidence of ground, characterized by comprising a third step of obtaining.
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